Hydraulic fracturing in the United States
Shale gas drilling rig near Alvarado, Texas
Hydraulic fracturing in the United States began in 1949. According to the Department of Energy (DOE), in 2013 at least two million oil and gas wells in the US have been hydraulically fractured, and that of new wells being drilled, up to 95% are hydraulically fractured. The output from these wells makes up 43% of the oil production and 67% of the natural gas production in the United States. Environmental safety and health concerns about hydraulic fracturing emerged in the 1980s, and are still being debated at the state and federal levels.
- 1 History
- 2 Typical extraction process
- 3 Economic impact
- 4 Environmental and health impact
- 5 Lawsuits
- 6 Regulation
- 6.1 Federal versus state regulation debate
- 6.2 Federal
- 6.3 State and local
- 6.3.1 Alaska
- 6.3.2 California
- 6.3.3 Colorado
- 6.3.4 Maryland
- 6.3.5 New Jersey
- 6.3.6 New York
- 6.3.7 Ohio
- 6.3.8 Pennsylvania
- 6.3.9 Texas
- 6.3.10 Vermont
- 6.3.11 Wyoming
- 7 Media and public relations
- 8 See also
- 9 Notes
- 10 References
- 11 Further reading
- 12 External links
Fracturing as a method to stimulate shallow, hard rock oil wells dates back to the 1860s. Oil producers in Pennsylvania, New York, Kentucky, and West Virginia used nitroglycerin (liquid at first, and later solid) to break up the oil-bearing formation. The method was later applied to water and natural gas wells. The idea of using acid as a nonexplosive fluid for well stimulation was introduced in the 1930s. Acid etching kept fractures open and enhanced productivity. Water injection and squeeze cementing (injection of cement slurry) had a similar effect.
The first industrial use of hydraulic fracturing was as early as 1903, according to T.L. Watson of the U.S. Geological Survey. Before that date, hydraulic fracturing was used at Mt. Airy Quarry, near Mt Airy, North Carolina where it was (and still is) used to separate granite blocks from bedrock.
Oil and gas wells
The relationship between well performance and treatment pressures was studied by Floyd Farris of Stanolind Oil and Gas Corporation. This study became a basis of the first hydraulic fracturing experiment, which was conducted in 1947 at the Hugoton gas field in Grant County of southwestern Kansas by Stanolind. For the well treatment 1,000 US gallons (3,800 l; 830 imp gal) of gelled gasoline and sand from the Arkansas River was injected into the gas-producing limestone formation at 2,400 feet (730 m). The experiment was not very successful as deliverability of the well did not change appreciably. The process was further described by J.B. Clark of Stanolind in his paper published in 1948. A patent on this process was issued in 1949 and an exclusive license was granted to the Halliburton Oil Well Cementing Company. On March 17, 1949, Halliburton performed the first two commercial hydraulic fracturing treatments in Stephens County, Oklahoma, and Archer County, Texas. The practice caught on quickly, and in 1965, a US Bureau of Mines publication wrote of hydraulic fracturing: "Many fields are in existence today because of these fracturing techniques for, without them, many producing horizons would have been bypassed in the past 15 years as either barren or commercially nonproductive."
Massive hydraulic fracturing
In the 1960s, American geologists became increasingly aware of huge volumes of gas-saturated rocks with permeability too low (generally less than 0.1 millidarcy) to recover the gas economically. The US government experimented with using underground nuclear explosions to fracture the rock and enable gas recovery from the rock. Such explosions were tried in the San Juan Basin of New Mexico (Project Gasbuggy, 1967), and the Piceance Basin of Western Colorado (Project Rulison, 1969, and Project Rio Blanco, 1973) but the results were disappointing, and the tests were halted. The petroleum industry turned to the new massive hydraulic fracturing technique as the way to recover tight gas.
The definition of a massive hydraulic fracturing varies somewhat, but is generally used for treatments injecting greater than about 300,000 pounds of proppant (136 tonnes). Pan American Petroleum applied the first massive hydraulic fracturing (also known as high-volume hydraulic fracturing) treatment in the non-communist world to a well in Stephens County, Oklahoma in 1968. The treatment injected half a million pounds of proppant into the rock formation.
In 1973, Amoco introduced massive hydraulic fracturing to the Wattenberg Gas Field of the Denver Basin of Colorado, to recover gas from the low-permeability J Sandstone. Before massive hydraulic fracturing, the Wattenberg field was uneconomic. Injected volumes of 132,000 or more gallons, and 200,000 or more pounds of sand proppant, succeeded in recovering much greater volumes of gas than had been previously possible. In 1974, Amoco performed the first million-pound frac job, injecting more than a million pounds of proppant into the J Sand of a well in Wattenberg Field.
The success of massive hydraulic fracturing in the Wattenberg Field of Colorado was followed in the late 1970s by its use in gas wells drilled to tight sandstones of the Mesaverde Group of the Piceance Basin of western Colorado.
Starting in the 1970s. thousands of tight-sandstone gas wells in the US were stimulated by massive hydraulic fracturing. Examples of areas made economic by the technology include the Clinton-Medina Sandstone play in Ohio, Pennsylvania, and New York; the San Juan Basin in New Mexico and Colorado; numerous fields in the Green River Basin of Wyoming; and the Cotton Valley Sandstone trend of Louisiana and Texas.
Coalbed methane wells
Coalbed methane wells, which first began to be drilled in the 1980s, are commonly hydraulically fractured to increase the flow rates to the well. Hydraulic fracturing is commonly used in some coalbed methane areas, such as the Black Warrior Basin and the Raton Basin, but not in others, such as the Powder River Basin, depending on the local geology. Injected volumes tend to be much smaller than those of either tight gas wells or shale gas wells; a 2004 EPA study found a median injected volume of 57,500 US gallons (218,000 l; 47,900 imp gal) for coalbed methane wells.
The combination of horizontal drilling and multistage hydraulic fracturing was pioneered in Texas’ Austin Chalk play in the 1980s. Stephen Holdich, head of the Department of Petroleum Engineering at Texas A&M University, commented: “In fact, the Austin Chalk is the model for modern shale development methods.” The Austin Chalk play started in 1981 with vertical wells, but died with the decline in the oil price in 1982. In 1983, Maurer Engineering designed the equipment to drill the first medium-range horizontal well in the Austin Chalk. Horizontal drilling revived the play by increasing production, and lengths of the horizontal parts of the wellbores grew with greater experience and improvements in drilling technology. Union Pacific Resources, since absorbed by Anadarko Petroleum, entered the Austin Chalk play in a major way in 1987, and drilled more than a thousand horizontal wells in the Austin Chalk, with multistage massive slickwater hydraulic fracture treatments, making major improvements in drilling and fracturing techniques.
Hydraulic fracturing of shales goes back at least to 1965, when some operators in the Big Sandy gas field of eastern Kentucky and southern West Virginia started hydraulically fracturing the Ohio Shale and Cleveland Shale, using relatively small fracs. The frac jobs generally increased production, especially from lower-yielding wells.
From 1976 to 1992 the United States government funded the Eastern Gas Shales Project, a set of dozens of public-private hydro-fracturing pilot demonstration projects. The program made a number of advances in hydraulic fracturing of shales. During the same period, the Gas Research Institute, a gas industry research consortium, received approval for research and funding from the Federal Energy Regulatory Commission.
In 1997, Nick Steinsberger, an engineer of Mitchell Energy (now part of Devon Energy), applied the slickwater fracturing technique, using more water and higher pump pressure than previous fracturing techniques, which was used in East Texas by Union Pacific Resources (now part of Anadarko Petroleum Corporation), in the Barnett Shale of north Texas. In 1998, the new technique approved to be successful when the first 90 days gas production from the well called S.H. Griffin No. 3 exceeded production of any of the company's previous wells. This new completion technique made gas extraction widely economical in the Barnett Shale, and was later applied to other shales. George P. Mitchell has been called the "father of fracking" because of his role in applying it in shales. The first horizontal well in the Barnett Shale was drilled in 1991, but was not widely done in the Barnett until it was demonstrated that gas could be economically extracted from vertical wells in the Barnett.
Between 2005 and 2010 the shale-gas industry in the United States grew by 45% a year. As a proportion of the country's overall gas production, shale gas increased from 4% in 2005 to 24% in 2012.
According to oilfield services company Halliburton, as of 2013 more than 1.1 million hydraulic fracturing jobs have been done in the United States (some wells are hydraulically fractured more than once), and almost 90% of new US onshore oil and gas wells are hydraulically fractured.
Typical extraction process
The process of extracting shale oil or gas typically has several stages, including some legal preliminaries. First, a company must negotiate the mineral rights with the owners.:44
After a company has leased the mineral rights, it must obtain a permit to drill a well.:44 Permits are regulated by state agencies and the requirements vary. Once it has obtained the permit, the company clears an area of 4–5 acres for a stage bed; it may also construct roads, a waste water site, and a temporary gas storage facility. Next is the drilling and casing of the well. In a process similar to that for constructing water wells, a bore machine drills vertically in the ground, and two or more steel casings are set in the well in a reverse telescope manner. The casing helps keep the well open by providing structural support and preventing fluid and gas flow into the surrounding ground. Once the casing is in place, cement is pumped down inside the casing and back up on the outside of the casing. This is done to cement the casing in the formation and to prevent any leakage or flow of the gas and fluids behind the casing.
The next step is the fracturing itself. A mixture of water and chemical additives are pumped down the well at high pressure. This creates fractures in the rock, and a proppant such as sand is injected to keep the fracture open. This allows the natural gas to flow to the well and up to the surface. The fracturing phase takes a few days.
After all this preparation, the well has a few years of production where natural gas is brought to the surface, treated, and carried off. This may be punctuated by workovers during which the well is cleaned and maintained to increase production. When the well has been exhausted, it is plugged. The area around it is restored to the level required by state standards and the agreement with the owner.
|This article needs to be updated. (November 2016)|
Hydraulic fracturing of tight oil and shale gas deposits has the potential to alter the geography of energy production in the US.[better source needed] In the short run, in counties with hydrofracturing employment in the oil and gas sector more than doubled in the last 10 years, with spill-overs in local transport-, construction but also manufacturing sectors.[better source needed] The manufacturing sector benefits from lower energy prices, giving the US manufacturing sector a competitive edge. On average, natural gas prices have decreased by more than 30% in counties above shale deposits compared to the rest of the US. Some research has highlighted the negative effects on house prices for properties in the direct vicinity of fracturing wells. Local house prices in Pennsylvania decrease if the property is close to a hydrofracking gas well and is not connected to city water, suggesting that the concerns of ground water pollution are priced by markets.
Oil and gas supply
The National Petroleum Council estimates that hydraulic fracturing will eventually account for nearly 70% of natural gas development in North America. In 2009, the American Petroleum Institute estimated that 45% of the United States natural gas production and 17% of oil production would be lost within 5 years without usage of hydraulic fracturing.
Of US gas production in 2010, 26% came from tight sandstone reservoirs and 23% from shales, for a total of 49%. As production increased, there was less need for imports: in 2012, the US imported 32% less natural gas than it had in 2007. In 2013, the US Energy Information Administration projected that imports will continue to shrink and the US will become a net exporter of natural gas some time around 2020.
Increased US oil production from hydraulically fractured tight oil wells was mostly responsible for the decrease in US oil imports since 2005 (decreased oil consumption was also an important component). The US imported 52% of its oil in 2011, down from 65% in 2005. Hydraulically fractured wells in the Bakken, Eagle Ford, and other tight oil targets, enabled US crude oil production to rise in September 2013 to the highest output since 1989.
Proponents of hydraulic fracturing touted its potential to make the United States the world's largest oil producer and make it an energy leader, a feat it achieved in November 2012 having already surpassed Russia as the world's leading gas producer. Proponents say that hydraulic fracturing would give the United States energy independence. In 2012, the International Energy Agency projected that the United States, now the world's third-largest oil producer behind Saudi Arabia and Russia, will see such an increase in oil from shales that the US will become the world's top oil producer by 2020. In 2011 the US became the world's leading producer of natural gas when it outproduced Russia. In October 2013, the US Energy Information Administration projected that the US had surpassed Russia and Saudi Arabia to become the world's leading producer of combined oil and natural gas hydrocarbons.
Globally, gas use is expected to rise by more than 50% compared to 2010 levels, and account for over 25% of world energy demand in 2035. Anticipated demand and higher prices abroad have motivated non-US companies to buy shares and invest in US gas and oil companies, and in the case of the Norwegian company Statoil, to buy an American company with hydraulic fracturing expertise and US shale oil production.
Some geologists say that the well productivity estimates are inflated and minimize the impact of the reduced productivity of wells after the first year or two. A June 2011 New York Times investigation of industrial emails and internal documents found that the profitability of unconventional shale gas extraction may be less than previously thought, due to companies intentionally overstating the productivity of their wells and the size of their reserves. The same article said, "Many people within the industry remain confident." T. Boone Pickens said that he was not worried about shale companies and that he believed they would make good money if prices rise. Pickens also said that technological advances, such as the repeated hydraulic fracturing of wells, was making production cheaper. Some companies that specialize in shale gas have shifted to areas where the gas in natural gas liquids such as propane and butane. The article was criticized by, among others, the New York Times' own Public Editor for lack of balance in omitting facts and viewpoints favorable to shale gas production and economics.
According to the World Bank, as of November 2012, the increased gas production due to horizontal drilling and hydraulic fracturing in the US had driven US gas prices down to 29% of natural gas prices in Europe, and to one-fifth of natural gas prices in Japan. Lower natural gas prices in the US have encouraged the replacement of coal- with gas-fired power plants, but have also discouraged the switch to renewable sources of energy. Facing a supply glut and consequent further price drops in 2012, some large US gas producers announced plans to cut natural gas production; however, production rates rose to all-time highs, and natural gas prices remained near ten-year lows. The high price of gas overseas has provided a strong incentive for producers to export it.
U.S.-based refineries have gained a competitive edge with their access to relatively inexpensive shale oil and Canadian crude. The U.S. is exporting more refined petroleum products, and also more liquified petroleum gas (LP gas). LP gas is produced from hydrocarbons called natural gas liquids, released by the hydraulic fracturing of petroliferous shale, in a variety of shale gas that's relatively easy to export. Propane, for example, costs around $620 a ton in the U.S. compared with more than $1,000 a ton in China, as of early 2014. Japan, for instance, is importing extra LP gas to fuel power plants, replacing idled nuclear plants. Trafigura Beheer BV, the third-largest independent trader of crude oil and refined products, said at the start of 2014 that "growth in U.S. shale production has turned the distillates market on its head."
In 2012, the U.S. imported 3,135 billion cubic feet (88.8 billion cubic metres) of natural gas and exported 1,619 billion cubic feet (45.8 billion cubic metres). Of the exports, 1,591 billion cubic feet (45.1 billion cubic metres) was sent by pipeline to Canada and Mexico; 18 billion cubic feet (510 million cubic metres) was re-exports of foreign shipments (bought at low prices and then held until the price went up); and the remaining 9.5 billion cubic feet (270 million cubic metres) was exported as liquefied natural gas (LNG) - natural gas that has been liquefied by cooling to about -161 degrees Celsius, reducing the volume by a factor of 600.
The US has two export terminals: one owned by Cheniere Energy in Sabine Pass, Louisiana, and a ConocoPhillips terminal in North Cook Inlet, Alaska. Companies that wish to export LNG must pass a two-step regulatory process required by the Natural Gas Act of 1938. First, the United States Department of Energy (DOE) must certify that the project is consistent with the public interest. This approval is automatic for export to the twenty countries that have a free trade agreement with the United States. Applications for export to non-FTA countries are published in the Federal Register and public comment is invited; but the burden of proof for any public harm rests with opponents of the application, so opposition by groups such as the Sierra Club has so far not blocked any approvals. In addition, the Federal Energy Regulatory Commission (FERC) must conduct an environmental review and approve the export facility. As of 2013, only one facility – the Sabine Pass terminal in Cameron Parish, Louisiana, run by Cheniere Energy – had both DOE and FERC approval and was under construction. Three others – Trunkline LNG in Lake Charles, Louisiana; Dominion Cove Point LNG in Lusby, Maryland; and a terminal in Freeport, Texas – have DOE approval and await FERC approval. On January 30, 2014, Cheniere Energy signed an agreement to supply 3.5 million tons to Korean Gas Corporation.
A partnership of three companies (UGI Corporation, Inergy Midstream L.P. and Capitol Energy Ventures) has proposed building a new pipeline connecting the Marcellus Shale formation with markets in Pennsylvania and Maryland. The pipeline would also supply LNG export terminals in Maryland.
Critics have charged that exporting LNG could threaten the national energy security provided by gas from hydraulically fractured shale gas wells.
Economic effects of hydraulic fracturing include increases in jobs and by extension and increases in business. The Environmental Protection Agency (EPA) states that it is unclear on a local level how and for how long hydraulic fracturing affects a community economically. It is hypothesized that hydraulic fracturing may not provide jobs to local communities due to the specialized nature of hydraulic fracturing tasks. Also, communities’ local resources could potentially be taxed due to the increase in industry traffic or if an accident occurs.
In most countries mineral rights belong to the government, but in the United States the default ownership is fee simple, meaning that a land owner also has the rights to the subsurface and the air above the property. However, the Stock-Raising Homestead Act of 1916 split the ownership, reserving mineral rights for the federal government in large parts of western states. The owners of the rights can also choose to split the rights. Since the hydraulic fracturing boom started, home builders and developers – including D. R. Horton, the nation's biggest home builder; Ryland Homes; Pulte Homes; and Beazer Homes USA – have retained the subsurface rights to tens of thousands of homes in states where shale plays exist or are possible. In most states, they are not legally required to disclose this, and many of the home buyers are unaware they do not own the mineral rights. Under split estate law, the surface owner must allow the mineral rights owner reasonable access. Protections for the surface owner vary; in some states an agreement is required that compensates them for the use of the land and reclaims the land after extraction is complete.:45
Since the presence of oil or gas is uncertain, the company usually signs a lease with a signing bonus and a percentage of the value at the wellhead as a royalty. Concerns have been raised regarding the terms and clarity of the leases energy companies are signing with landowners, as well as the manner in which they are sold and the tactics used by companies in implementing them.
A well on one property can drain oil or gas from neighboring properties, and horizontal drilling can facilitate this. In some parts of the U.S., the rule of capture gives the landowner rights to any resources they extract from their well.:21 Other states have unitization rules for sharing royalties based on the geometries of the reservoir and the property lines above it.
A lease of oil and gas rights violates the terms of many mortgage agreements, including those used by Fannie Mae and Freddie Mac, because it devalues the property and allows hazardous materials on the property. As a result, some banks are refusing to make mortgages on land if with such a lease.
Nationwide Insurance does not cover hydraulic fracturing related damage because it considered the risks of problems like water contamination made the financial exposure too great. However, to date there have been no substantial claims that targeted companies other than those owning or operating wells.
Environmental and health impact
Potential environmental effects of hydraulic fracturing include contamination of ground water, risks to air quality, the potential migration of gases and hydraulic fracturing chemicals to the surface, the potential mishandling of waste, and the resulting effects on health such as an increased rate of cancer and related environmental contamination.
While gas drilling companies are reluctant to reveal the proprietary substances in the fluid, the list of additives for hydraulic fracturing includes kerosene, benzene, toluene, xylene, and formaldehyde. It has been predicted that exposure to chemicals in hydraulic fracturing fluid will increase as gas wells using this technology proliferate.
In April 2011, the Ground Water Protection Council launched FracFocus.org, an online voluntary disclosure database for hydraulic fracturing fluids. The site is funded by oil and gas trade groups and the DOE. The site has been met with some skepticism relating to proprietary information that is not included, although President Obama's energy and climate adviser Heather Zichal has said of the database: “As an administration, we believe that FracFocus is an important tool that provides transparency to the American people.”  At least five states – including Colorado  and Texas – have mandated fluid disclosure  and incorporated FracFocus as the tool for disclosure. As of March 2013, FracFocus had more than 40,000 searchable well records on its site.
The FracTracker Alliance, a non-profit organization, provides oil and gas-related data storage, analyses, and online and customized maps related to hydraulic fracturing. Their website, FracTracker.org, also includes a photo library and resource directory. 
EPA hydraulic fracturing study
In 2010 Congress requested that the Environmental Protection Agency (EPA) undertake a new, broader study of hydraulic fracturing. The report was released in 2015. The purpose of the study was to examine the effects of hydraulic fracturing on the water supply, specifically for human consumption. The research aims to examine the full scope of the water pathway as it moves through the hydraulic fracturing process, including water that is used for the construction of the wells, the fracturing mixture, and subsequent removal and disposal. Fundamental research questions include:
- How might large volume water withdrawals from ground and surface water impact drinking water resources?
- What are the possible impacts of releases of flowback and produced water on drinking water resources?
- What are the possible impacts of inadequate treatment of hydraulic fracturing wastewaters on drinking water resources?
The Scientific Advisory Board reviewed the study plan in early March 2011. In June 2011, the EPA announced the locations of its five retrospective case studies, which will examine existing hydraulic fracturing sites for evidence of drinking water contamination. They are:
- Bakken Shale - Kildeer, and Dunn Counties, North Dakota
- Barnett Shale - Wise and Denton Counties, Texas (Hydraulic Fracturing is currently banned in Denton County as of November 4, 2014)
- Marcellus Shale - Bradford and Susquehanna Counties, Pennsylvania
- Marcellus Shale - Washington County, Pennsylvania
- Raton Basin (coalbed methane) - Las Animas County, Colorado
Dr. Robin Ikeda, Deputy Director of Noncommunicable Diseases, Injury and Environmental Health at the CDC noted that none of the following EPA investigation sites were included in the final version of EPA’s Study of the Potential Impacts of Hydraulic Fracturing on Drinking Water Resources: Dimock, Pennsylvania; LeRoy, Pennsylvania; Pavillion, Wyoming; Medina, Ohio; Garfield County, Colorado.
The completed report draft was posted in 2015 and is available on the EPA website. The report concluded that while very few cases of water contamination have been found relative to the abundance of fracking, there are several concerns for potential contamination in the future. The report was not regulatory in nature but instead was created to inform local governments, the public, and industry, of current data for use in future decision making.
A majority of the EPA's Scientific Advisory Board advised the EPA to scale back proposed toxicity testing of fracking chemicals, and not pursue development of tracer chemicals to be added to frack treatments, because of time limitations. Chesapeake Energy agreed with the recommendation. The study's Science Advisory Board advised the EPA to delete proposed toxicity tests from the study scope, due to limited time and funds. However, some members of the Science Advisory Board (SAB) urged the SAB to advise the EPA to reinstate the toxicity testing of hydraulic fracturing chemicals. Chesapeake Energy agreed, stating “an in-depth study of toxicity, the development of new analytical methods and tracers are not practical given the budget and schedule limitation of the study.” Thus, despite concerns about the elevated levels of iodine-131 (a radioactive tracer used in hydraulic fracturing) in drinking water in Philadelphia and Pittsburgh, downstream from hydraulic fracturing sites, iodine-131 is not listed among the chemicals to be monitored in the draft plan for the study. Other known radioactive tracers used in hydraulic fracturing but not listed as chemicals to be studied include isotopes of gold, xenon, rubidium, iridium, scandium, and krypton.
Hydraulic fracturing uses between 1.2 and 3.5 million US gallons (4,500 and 13,200 m3) of water per well, with large projects using up to 5 million US gallons (19,000 m3). Additional water is used when wells are refractured. An average well requires 3 to 8 million US gallons (11,000 to 30,000 m3) of water over its lifetime.
According to Environment America, a federation of state-based, citizen-funded environmental advocacy organizations, there are concerns for farmers competing with oil and gas for water. A report by Ceres questions whether the growth of hydraulic fracturing is sustainable in Texas and Colorado as 92% of Colorado wells were in extremely high water stress regions (that means regions where more than 80% of the available water is already allocated for agricultural, industrial and municipal water use) and 51% percent of the Texas wells were in high or extremely high water stress regions.
Consequences for agriculture have already been observed in North America. Agricultural communities have already seen water prices rising because of that problem. In the Barnett Shale region, in Texas and New Mexico, drinking water wells have dried as hydraulic fracturing water has been taken from an aquifer used for residential and agricultural use.
Well blowouts and spills of fracturing fluids
A well blowout in Clearfield County, Pennsylvania on June 3, 2010, sent more than 35,000 gallons of hydraulic fracturing fluids into the air and onto the surrounding landscape in a forested area. Campers were evacuated and the company EOG Resources and the well completion company C.C. Forbes were ordered to cease all operations in the state of Pennsylvania pending investigation. The Pennsylvania Department of Environmental Protection called it a "serious incident".
Fluid injection and seismic events
Injection of fluid into subsurface geological structures, such as faults and fractures, reduces the effective normal stress acting across these structures. If sufficient shear stress is present, the structure may slip in shear and generate seismic events over a range of magnitudes; natural gas drilling may have caused earthquakes in North Texas. Reports of minor tremors of no greater than 2.8 on the Richter scale were reported on June 2, 2009 in Cleburne, Texas, the first in the town's 140-year history.
In July 2011, the Arkansas Oil and Gas Commission voted to shut down four produced water disposal wells, and to impose a permanent moratorium on Class II disposal wells in a faulted area of Faulkner, Van Buran, and Cleburne counties which has experienced numerous earthquakes. The U.S. Geological Survey is working on ways to avoid quakes from wastewater disposal wells.
In 2014, Oklahoma had 585 earthquakes with a magnitude of 3.0 or greater. Between the years 1978 and 2008 the state averaged 1.6 quakes of these magnitudes a year. The quakes are very likely related to the deep injection of oil and gas wastewater, a significant portion of which comes from wells which have been hydraulically fractured. The fluid travels underground, often changing the pressure on fault lines.
Fluid withdrawal and land subsidence
Subsidence (the sinking of land) may occur after considerable production of oil or ground water. Oil, and, less commonly, gas extraction, has caused land subsidence in a small percentage of fields. Significant subsidence has been observed only where the hydrocarbon reservoir is very thick, shallow, and composed of loose or weakly cemented rock. In 2014, the British Department of Energy and Climate change noted that there are no documented cases of land subsidence connected with hydraulic fracturing, and that land subsidence due to extraction from shale is unlikely, because shale is not easily compressed.
Air and health
Many particulates and chemicals can be released into the atmosphere during the process of hydraulic fracturing, such as sulfuric oxide, nitrous oxides, volatile organic compounds (VOC), benzene, toluene, diesel fuel, and hydrogen sulfide, all of which can have serious health implications. A study conducted between August 2011 and July 2012 as part of Earthworks’ Oil & Gas Accountability Project (OGAP) found chemical contaminants in the air and water of rural communities affected by the Shale extraction process in central New York and Pennsylvania. The study found disproportionately high numbers of adverse health effects in children and adults in those communities.
A potential hazard that is commonly overlooked is the venting of bulk sand silos directly to atmosphere. When they are being filled, or emptied during the fracture job, a fine cloud of silica particulate will be vented directly into atmosphere. This dust has the potential to travel many kilometers on the wind directly into populated areas. While the immediate personnel are wearing personal protective equipment, other people in the area of a well fracture can potentially be exposed.
A 2012 study out of Cornell's College of Veterinary Medicine by Robert Oswald, a professor of molecular medicine at Cornell's College of Veterinary Medicine, and veterinarian Michelle Bamberger, DVM, soon to be published in 'New Solutions: A Journal of Environmental and Occupational Health Policy,' suggests that hydraulic fracturing is sickening and killing cows, horses, goats, llamas, chickens, dogs, cats, fish and other wildlife, as well as humans. The study covered cases in Colorado, Louisiana, New York, Ohio, Pennsylvania and Texas. The case studies include reports of sick animals, stunted growth, and dead animals after exposure to hydraulic fracturing spills from dumping of the fluid into streams and from workers slitting the lining of a wastewater impoundment (evaporation ponds) so that it would drain and be able to accept more waste. The researchers stated that it was difficult to assess health impact because of the industry's strategic lobbying efforts that resulted in legislation allowing them to keep the proprietary chemicals in the fluid secret, protecting them from being held legally responsible for contamination. Bamberger stated that if you don't know what chemicals are, you can't conduct pre-drilling tests and establish a baseline to prove that chemicals found postdrilling are from hydraulic fracturing. The researchers recommended requiring disclosure of all hydraulic fracturing fluids, that nondisclosure agreements not be allowed when public health is at risk, testing animals raised near hydraulic fracturing sites and animal products (milk, cheese, etc.) from animal raised near hydraulic fracturing sites prior to selling them to market, monitoring of water, soil and air more closely, and testing the air, water, soil and animals prior to drilling and at regular intervals thereafter.
CNN has reported flammable tap water in homes located near hydraulic fracturing sites in Portage County, Ohio. On October 18, 2013 the Ohio Department of Natural Resource-Division of Oil & Gas Resources Management found that the Kline's pre-drilling water sample showed methane was present in August 2012 before gas wells were drilled near their home. The report further states the gas was microbial in origin and not thermogenic like gas produced from gas wells. Research done by the ODNR found that naturally occurring methane gas was present in the aquifers of Nelson and Windham Townships of Portage County, Ohio.
A 2014 study of households using groundwater near active natural gas drilling in Washington County, Pennsylvania found that upper respiratory illnesses and skin diseases were much more prevalent closer to hydraulic fracturing activity. Respiratory problems were found in 18% of the population 1.2 miles or more from drilling, compared to 39% of those within 0.6 miles of new natural gas wells. People with clinically significant skin problems increased from 3% to 13% over the same distances.
Methane leakage is one hazard associated with hydraulic fracturing natural gas. Methane is a prominent greenhouse gas. Over a twenty-year period, it is 72 times more potent than carbon dioxide. In 2012 it accounted for 9% of all US greenhouse gas emissions. Natural Gas and Petroleum Systems are the largest contributor, providing 29% of the emissions. Natural gas drilling companies are beginning to incorporate technologies called green completion to minimize methane leakage.
The indirect effects of the increase in the supply of natural gas from fracking have only recently started to be measured. A 2016 study of air pollution from coal generation in the US found that there may have been indirect benefits from fracking through the displacement of coal by natural gas as an energy source. The increase in fracking from 2009 led to a drop in natural gas prices that made natural gas become more competitive with coal. This analysis estimates coal generation decreased as a result by 28%, which led to an average reduction of 4% in air pollution yielding positive health benefits. However, this is only the case in the US and may not be applicable to other countries with lower coal generation rates.
Impacts on Human Health
The evidence about the potential detrimental health effects as a result of fracking have been mounting; threatening the well being of humans, animals and our environment. These pollutants, even when exposed to at low levels, can lead to a multitude of both short and long term symptoms. Many of these health consequences start off as acute issues, but due to long term exposure turn into chronic diseases. Volatile organic compounds and diesel particulate matter, for example, result in elevated air pollution concentrations that exceed US Environmental Protection Agency (EPA) guidelines for both carcinogenic and noncarcinogenic health risks.
According to the National Resources Defense Council, cancer causing pollutants such as benzene, formaldehyde, and diesel have been found in the air near fracking sites. These pollutants generate wastewater, which is linked to groundwater contamination, threatening nearby drinking water and causing concern for anyone who is exposed. Studies done by The National Institute for Occupational Safety and Health, found that “Fracking also uses crystalline silica, which is a type of sand that’s used to keep the fractures open.”  Exposure to this, along with dust and other air pollutants produced from fracking, can cause respiratory problems. The Environmental Working Group states that; "Silica can impede breathing and cause respiratory irritation, cough, airway obstruction and poor lung function and Chronic or long-term exposure can lead to lung inflammation, bronchitis and emphysema and produce a severe lung disease known as silicosis, a form of pulmonary fibrosis. Silica-related lung disease is incurable and can be fatal."
One of the most common types of pollutants released into the air from fracking is methylene chloride, thought to be one of the most concerning due to its potentially severe impact on neurological functioning. Once again, the impacts can range from acute and moderate to chronic and more severe. Dizziness, headaches, seizures and loss of consciousness have all been observed in people exposed to this deadly chemical. Longer-term impacts tend to present themselves in areas such as memory loss, lower IQ and delayed mental development.
Expecting mothers are also being cautioned. Polycyclic aromatic hydrocarbons released into the air from fracking has been linked to potential reproductive problems. A study conducted by the Colorado Department of Environmental and Occupational Health found that “Mothers who live near fracking sites are 30 percent more likely to have babies with congenital heart defects.” The National Resource Defense Council also claims there’s the potential for “Harm to the developing heart, brain and nervous system. Because even short-term exposures to these pollutants at critical moments of development can result in long-lasting harm.” 
Despite researcher’s knowledge about the adverse health effects these pollutants can have on humans and the environment, it’s challenging to fully understand the direct health impacts that are a result from fracking and assess the potential long term health and environmental effects. This is because the oil and gas industry is legally protected from disclosing what is in the chemical compounds they use for fracking. “Policies are also lacking in requiring full health impact assessments to be required before companies are given the go-ahead to drill” 
In 2013 the United States the Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health (NIOSH) released a hazard alert based on data collected by NIOSH that "workers may be exposed to dust with high levels of respirable crystalline silica (silicon dioxide) during hydraulic fracturing." NIOSH notified company representatives of these findings and provided reports with recommendations to control exposure to crystalline silica and recommend that all hydraulic fracturing sites evaluate their operations to determine the potential for worker exposure to crystalline silica and implement controls as necessary to protect workers.
The EPA states in their Hydraulic Fracturing Study Plan (2011) that the exposure to hydraulic fracturing chemicals in an occupational setting needs to be examined to determine the acute and chronic effects on health. The exposure risks such as “transport, mixing, delivery, and potential accidents” have not been properly assessed (p. 57).
A 2012 OSH article outlined the risk of worker radiation exposure.
The natural gas industry has responded to state and local regulations and prohibitions with two primary types of lawsuits: preemption challenges, which argue that federal law prevents state governments from passing fracking restrictions, and Takings Clause challenges, which argue that the federal constitution entitles a company to compensation when a fracking ban or limitation renders that company’s land useless.
In September 2010, a lawsuit was filed in Pennsylvania alleging that Southwestern Energy Company contaminated aquifers through a defective cement casing in the well. There have been other cases as well. After court cases concerning contamination from hydraulic fracturing are settled, the documents are sealed, and information regarding contamination is not available to researchers or the public. While the American Petroleum Institute deny that this practice has hidden problems with gas drilling, others believe it has and could lead to unnecessary risks to public safety and health.
In June 2011, Northeast Natural Energy sued the town of Morgantown, West Virginia, for its ban on hydraulic fracturing in the Marcellus Shale within a mile of the town's borders. The ban had been initiated to protect the municipal water supply as well as the town's inhabitants, in the absence at the state level of regulations specific to hydraulic fracturing.
The number of proposed state regulations related to hydraulic fracturing has dramatically increased since 2005. The majority specifically address one aspect of natural gas drilling, for example wastewater treatment, though some are more comprehensive and consider multiple regulatory concerns.
The regulation and implementation process of hydraulic fracturing is a complex process involving many groups, stakeholders, and impacts. The EPA has the power to issue permits for drilling and underground injection, and to set regulations for the treatment of waste at the federal level. However, the scope of its authority is debated, and the oil and gas industry is considering lawsuits if guidance from the EPA is overly broad. States are required to comply with federal law and the regulations set by the EPA. States, however, have the power to regulate the activities of certain companies and industries within their borders - they can create safety plans and standards, management and disposal regulations, and public notice and disclosure requirements. Land-use ordinances, production standards, and safety regulations can be set by local governments, but the extent of their authority (including their power to regulate gas drilling) is determined by state law. Pennsylvania’s Act 13 is an example of how state law can prohibit local regulation of hydraulic fracturing industries. In states including Ohio and New Mexico, the power to regulate is limited by trade secret provisions and other exemptions exist that preclude companies from disclosing the exact chemical content of their fluids. Other challenges include abandoned or undocumented wells and hydraulic fracturing sites, regulatory loopholes in EPA and state policies, and inevitable limitations to the enforcement of these laws.
Federal versus state regulation debate
Since 2012 there has been discussion whether fracking should be regulated at the state or federal level. Advocates of state level control of energy sources (e.g., oil, gas, wind and solar), argue that a state-by-state approach allows each state to create regulations and review processes that fit each state's particular geological, ecological and citizen concerns. Critics say that this would create a patchwork of inconsistent regulations. They also note that the components and consequences of energy development (e.g., emissions, commerce, wastewater, earthquakes, and radiation) may cross state lines. Local and state governments may also lack resources to initiate and defend against corporate legal action related to hydraulic fracturing.
Those supporting federal regulation think it will provide a more consistent, uniform standard as needed for national environment and public health standards, like those related to water and air pollution (e.g., public disclosure of chemicals used in hydraulic fracturing, protection of drinking water sources, and control of air pollutants). A compromise called, "cooperative federalism" has been proposed like an approach used for coal since 1977. Here, the federal government sets baseline standards rather than detailed specifications, and allows states to be more flexibile in meeting the standards. It would require the federal government to remove some regulatory exemptions for hydraulic fracturing (e.g., the Energy Policy Act of 2005, which exempted oil and gas producers from certain requirements of the Safe Drinking Water Act), and develop a comprehensive set of regulations for the industry.
The EPA and the industry group the American Petroleum Institute each provided grants to fund the organization State Review of Oil and Gas Environmental Regulations (STRONGER), to promote better state oversight of oil and gas environmental issues. At the invitation of a state the organization reviews their oil and gas environmental regulations in general, and hydraulic fracturing regulations in particular, and recommends improvements. As of 2013[not in citation given], STRONGER has reviewed hydraulic fracturing regulations in six states: Arkansas, Colorado, Louisiana, Ohio, Oklahoma, and Pennsylvania (reviews available on the STRONGER website).[full citation needed][non-primary source needed]
Regulation at the state level of sets lower standard of regulations in terms of environmental issues than federal ones for different reasons. Firstly, states only have legislative power over their own territory so the potential areas affected by regulation may be more limited than the federal one. Related to that, the EPA has power over inter-state or boundary resources such as rivers, thus a broader regulative power. Secondly, environmental issues at the scale of states are usually related to energetic and economic issues through energy administrations, leaving the environmental impact often subsidiary to economic considerations, whereas the EPA's unique mandate concerns environmental issues, regardless of their economic or energetic aspect, since it is more independent from energy administrations. State regulations are therefore considered to be generally weaker than federal ones. Thirdly, state-level policies are more subject to discreet political majority changes and lobbying whereas federal agencies theoretically work more independently from Congress and thus deliver more continuity in terms of policy-making.
The academic literature has increasingly stressed often competing regulatory agendas of natural gas advocates and environmentalists. Environmentalists and the supporters of a precautionary approach have advocated federal and powerful inter-state regulation as well as democratic empowerment of local communities. They have therefore supported inter-state organizations that gather state and federal actors such as the Delaware River Basin Commission when “natural gas policy” ones might not include federal actors. However, natural gas production advocates have favored state-level and weaker inter-state regulations and the withdrawal of regulatory powers such as zoning from local communities and institutions. They have only supported a subset of interstate organizations, typically those pledging support for weaker regulations and which do not include advocacy for regulatory powers such as the Interstate Oil and Gas Compact Commission.
Proponents for state, rather than federal regulation argue that states, with local and historical knowledge of their unique landscapes, are better able to create effective policy than any standardized federal mandate. Congress as well as industry leaders have had a major impact on the regulatory exemptions of hydraulic fracturing and continue to be the dominant voice in determining regulation in the United States.
Hydraulic fracturing has known impacts on the environment and potential unknown direct or indirect impacts on the environment and human health. It is therefore part of the EPA's area of regulation. The EPA assures surveillance of the issuance of drilling permits when hydraulic fracturing companies employ diesel fuel. This is its main regulatory activity but it has been importantly reduced in its scope by the Energy Policy Act of 2005 that excluded hydraulic fracturing from the Safe Drinking Water Act’s Underground Injection Control’s regulation, except when diesel is used. This has raised concerns about the efficiency of permit issuance control. In addition to this mission, the EPA works with states to provide safe disposal of wastewater from hydraulic fracturing, has partnerships with other administrations and companies to reduce the air emissions from hydraulic fracturing, particularly from methane employed in the process, and tries to ensure both compliance to regulatory standards and transparency for all stakeholders implied in the implementation process of hydraulic fracturing.
On August 7, 1997, the Eleventh Circuit Court ordered the United States Environmental Protection Agency to reevaluate its stance on hydraulic fracturing based on a lawsuit brought by the Legal Environmental Assistance Foundation. Until that decision, the EPA deemed that hydraulic fracturing did not fall under the rules in the Safe Drinking Water Act. While the impact of this decision was localized to Alabama, it forced the EPA to evaluate its oversight responsibility under the Safe Drinking Water Act for hydraulic fracturing. In 2004, the EPA released a study that concluded the threat to drinking water from hydraulic fracturing was “minimal”. In the Energy Policy Act of 2005, Congress exempted fractured wells from being re-classified as injection wells, which fall under a part of the Safe Drinking Water Act that was originally intended to regulate disposal wells. The act did not exempt hydraulic fracturing wells that include diesel fuel in the fracturing fluid. Some US House members have petitioned the EPA to interpret "diesel fuel" broadly to increase the agency's regulatory power over hydraulic fracturing. They argue that the current limitation is intended not to prevent the use of a small subset of diesel compounds, but rather as a safety measure to decrease the probability of accidental groundwater contamination with toxic BTEX chemicals (benzene, toluene, ethylbenzene and xylenes) that are present in diesel compounds. Congress has been urged to repeal the 2005 regulatory exemption under the Energy Policy Act of 2005. The FRAC Act, introduced in June 2009, would eliminate the exemption and might allow producing wells to be reclassified as injection wells placing them under federal jurisdiction in states without approved UIC programs.
In November 2012, the Centers for Disease Control and Prevention was considering to study a potential link between fracturing and drinking water contamination. Republican House energy leaders advised Department of Health and Human Services (HHS) Secretary Kathleen Sebelius to be cautious in the study. They argued the study, if not properly done, could hinder job growth. They worried that the study could label naturally occurring substances in groundwater as contaminants, that the CDC would limit hydraulic fracturing in the interest of public health, and that the "scientific objectivity of the [HHS] [wa]s being subverted" as the CDC was considering whether to study the question.
Environmental Protection Agency Administrator Lisa Jackson said the EPA would use its power to protect residents if drillers endangered water supplies and state and local authorities did not take action.
In March 2015, Democrats in Congress reintroduced a series of regulations known as the "Frack Pack." These regulations were imposed on the domestic petroleum industry. The package would regulate hydraulic fracturing under the Safe Drinking Water Act and require chemicals used in hydraulic fracturing fluid to be disclosed to the public. It would require pollution tests of water sources before and during petroleum development. It would require oil and gas producers to hold permits in order to increase stormwater runoff. New regulations set safety standards for how used chemicals are stored around well sites and necessitate companies to submit information on their well geology to the Bureau of Land Management, which is a section of the Interior Department. The "Frack Pack" has received criticism, especially from The Western Energy Alliance petroleum industry group, for duplicating state regulations that already exist.
Fracturing Responsibility and Awareness of Chemicals Act
Congress has been urged to repeal the 2005 regulatory exemption under the Energy Policy Act of 2005 by supporting The FRAC Act, introduced in June 2009, but has so far refused. In June 2009 two identical bills named the Fracturing Responsibility and Awareness of Chemicals Act were introduced to both the United States House and the Senate. The House bill was introduced by representatives Diana DeGette, D-Colo., Maurice Hinchey D-N.Y., and Jared Polis, D-Colo. The Senate version was introduced by senators Bob Casey, D-Pa., and Chuck Schumer, D-N.Y. These bills are designed to amend the Safe Drinking Water Act. This would allow the Environmental Protection Agency to regulate hydraulic fracturing that occurs in states which have not taken primacy in UIC regulation. The bill required the energy industry to reveal what chemicals are being used in the sand-water mixture. The 111th United States Congress adjourned on January 3, 2011, without taking any significant action on the FRAC Act. The FRAC Act was re-introduced in both houses of the 112th United States Congress. In the Senate, Sen. Bob Casey (D-PA) introduced S. 587 on March 15, 2011. In the House, Rep. Diana DeGette (D-CO) introduced H.R. 1084 on March 24, 2011. As of March 2012 Congress had not yet passed either of The FRAC Act bills. The oil and gas industry contributes heavily to campaign funds.
In May 2012, the Department of Interior released updated regulations on hydraulic fracturing, for wells on federal lands. However, Guggenheim Washington Research Group found that only about 5% of the shale wells drilled in the past 10 years were on federal land.
Voluntary disclosure of additives
In April 2011, the Ground Water Protection Council, in conjunction with the industry, began releasing well-by-well lists of hydraulic fracturing chemicals at . Disclosure is still on a voluntary basis; companies are still not required to provide information about their hydraulic fracturing techniques and fluids that they consider to be proprietary. Lists do not include all substances used; a complete listing of the specific chemical formulation of additives used in hydraulic fracturing operations is still not currently made available to landowners, neighbors, local officials, or health care providers, let alone the public. This practice is under scrutiny. Two studies released in 2009, one by the DOE and the other released by the Ground Water Protection Council, discuss hydraulic fracturing safety concerns. Chemicals which can be used in the fracturing fluid include kerosene, benzene, toluene, xylene, and formaldehyde.
State and local
The controversy over hydraulic fracturing has led to legislation and court cases over primacy of state regulation versus the rights of local governments to regulate or ban oil and gas drilling. Some states have introduced legislation that limits the ability of municipalities to use zoning to protect citizens from exposure to pollutants from hydraulic fracturing by protecting residential areas. Such laws have been created in Pennsylvania, Ohio, and New York.
Local regulations can be a dominant force in enacting drilling ordinances, creating safety standards and production regulations, and enforcing particular standards. However, in many cases state law can intervene and dominate local law. In Texas, the Railroad Commission of Texas has the authority to regulate certain industries and the specifics of their safety standards and production regulations. In this case, the state determined the zoning, permitting, production, delivery, and safety standards.
In New York, local land use laws are considered in state regulations, and in Pennsylvania, the state's Oil and Gas Act superseded all local ordinances purporting to regulate gas well operations.”  Additionally, Los Angeles in 2013 become the largest city in the US to pass a hydraulic fracturing moratorium.
Hydraulic fracturing has been conducted at the North Slope and the Kenai Peninsula on the South coast of Alaska. Due to potential harm to Alaska's fragile environment, there have been hearings on new regulations for this type of oil extraction.
In May 2012 the California Senate defeated a bill, introduced by state Sen. Fran Pavley (D-Agoura Hills), requiring drillers to notify local property owners and water authorities in advance that hydraulic fracturing was going to occur, and requiring the testing of groundwater before and after the hydraulic fracturing to determine whether contamination had occurred. Pavley said that this monitoring and reporting approach would help to address citizens' concerns. The state Senate defeated the bill in a bipartisan 18-17 vote.
The California legislature passed Senate Bill 4 to regulate hydraulic fracturing in September 2013. The bill, signed by Governor Jerry Brown, provided for disclosure of chemical used, pre-testing of nearby water wells, and a study on environmental and safety issues. These regulations, which went into effect on January 1, 2015, require "oil companies to obtain permits for fracking as well as acidizing, the use of hydrofluoric acid and other chemicals to dissolve shale rock." Democratic Senator Fran Pavley, who introduced the bill, hoped that it would comprehensively regulate and oversee hydraulic fracturing, as well as create transparency for the public. The bill seemed to be a step in the right direction for environmentalists, but some criticized the bill as being too lax. Kassie Siegel of the Center for Biological Diversity said: “SB 4 was amended in the final hours of the legislative session to take it from to a bill that didn't go far enough to protect Californians from fracking to a bill that actually gave away important protections to oil companies."  Some environmentalists promised not to rest until fracking is banned completely. Oil industry representatives also criticized the bill as too restrictive. The measure was supported by state Sen. Fran Pavley, author of a fracking bill defeated the previous year.
Several cities within California are working toward banning or placing strict restrictions on hydraulic fracturing. The two cities most actively fighting hydraulic fracturing are Los Angeles and Beverly Hills. Los Angeles is working toward a moratorium on hydraulic fracturing and Beverly Hills has banned the process altogether.
Beverly Hills, which is built above the Beverly Hills Oil Field, has become the first California Municipality to effectively ban hydraulic fracturing. On April 21, 2014, the city council met and members voted unanimously to ban hydraulic fracturing in their city. Along with members in the Beverly Hills' council, there were also anti-fracking representatives from other cities hoping to achieve similar outcomes. Environmentalists conclude that there is no safe way to frack and that the process can lead to air and water pollution, as well as an increase in earthquakes. For these reasons, fracking needs to be banned not just regulated. The second and final vote to enact the ban on hydraulic fracturing was held on May 6. The vote was again unanimous, and Beverly Hills became the first city in California to actively ban the technique for extracting natural gas and oil. There were no official plans to implement hydraulic fracturing in Beverly Hills, but the process was taking place in surrounding areas in the Los Angeles county. The ban will take effect on June 6.
In November 2013, voters in three Colorado cities (Boulder, Fort Collins, and Loveland) approved ballot initiatives to impose or extend moratoria on hydraulic fracturing. At the same time, Broomfield voters narrowly defeated an anti-fracking initiative.
Fracking in Colorado remains tight and regulations unclear. There are several anti-fracking groups that continue to offer instances of environmental endangerment in debates for regulations, while the pro-fracking community continues to probe towards these endangerments as a past concern with new regulations being constructed. Part of these regulations include the Oil and Gas Task Force being required to disclose the chemicals being used during fracking. These types of rulings are slowing the fracking process down in Colorado and continue to come up only, making it more difficult for Oil and Gas companies to continue fracking while complying with the regulations.[not in citation given]
History of fracking in Colorado
While relatively new in the public spotlight of Colorado fracking in the state has actual been going on since the 1973 when the first large scale fracking operation began in the Wattenberg gas field in weld county, CO. 1992 there were two landmark decisions made in Colorado that were upheld by the supreme court, these were La Plata and Voss counties in Colorado. The La Plata county ruling held up an ordinance that oil and gas companies must receive special permitting from the county commissioner or planning staff before drilling can begin. The ruling in Voss county upheld a ban on hydraulic fracturing in Greeley, CO as it is a home-ruled municipality, this ban was being challenged by the oil and gas industry. The next major ruling on fracking in Colorado came in 2012 when Longmont passed ballot measure 300, banning hydraulic fracturing and other uses of hydrocarbons for the extraction of gas and oil. The Colorado oil and gas association is currently suing Longmont over the ballot measure and the case has yet to be argued. In 2013 flooding in the Colorado front range caused 14 oil spills totaling 48,000 gallons of oil spilled into the Colorado front range.
Future ballot initiatives in Colorado
There are currently two ballot initiatives in Colorado that deal directly with fracking policy. Initiative 75 which seeks to give communities power to regulate oil and gas development and Initiative 78 imposes a 2500-foot mandatory distance between fracking sites and residential homes, schools, and hospitals both of these initiatives failed to make the ballot this November after they failed to reach the requisite number of votes this decision by the governor's office is currently being challenged by the environmental organizations who brought these ballot measures to light and who believe that they had collected the requisite amount of signatures to allow voting on the measures to take place in November. Individuals can report a health concern by: filing out our self-referral form found at http://www.oghir.dphe.state.co.us/Home/HealthConcernForm or calling the CO HELP line at 303-389-1687. Additional complaint forms can be found at https://www.colorado.gov/pacific/cdphe/health-facilities-complaint-and-occurrence-contacts
Fracking in Garfield County, Colorado
Air sample study
Findings from a recent three year long study done in Garfield County, Colorado by researchers at Colorado State University was published in June 2016. They collected weekly air samples within one mile of 130 shale gas wells. From these samples, they reported 61 airborne chemicals present. Methylene Chloride was among one of the most concerning and prevalent (in 73% of all the weekly air samples), pollutants found. The EPA has classified Methylene Chloride as a potential carcinogen, that can produce a variety of detrimental health effects.
Health Impact Assessment
Prior to the Air Sample study, a team of researchers from the Department of Environmental and Occupational Health at the Colorado School of Public Health (2010) conducted a Health Impact Assessment to “Help address community concerns regarding future land use decisions” in Garfield County, Colorado. The team examined the various implications fracking is having on not only air quality, but water and soil quality, traffic and noise/vibration and light as well. The team evaluated their findings and the potential implications they may pose to the health of the community. The study provided one of the first ever detailed accounts of the impacts fracking can pose to communities. For a detailed review of the Health Impact Study, check out their published findings here. http://www.garfieldcounty.com/publichealth/documents/1%20%20%20Complete%20HIA%20without%20Appendix%20D.pdf.
Health Implications for Residents of Garfield County
Children and the elderly are thought to be amongst the most vulnerable populations to experience negative health impacts from the environment, due to their immune systems being more susceptible to damage. In Garfield County, Colorado, fracking has become a main infrastructure and residents are already reporting an influx of health problems. Residents have reported skin problems, such as rashes, itching and burning. A resident interviewed back in 2005 reported having multiple sinus infections and benign growths on her thyroid. The woman claimed that more recently she had “suffered from blood clots and a mild stroke for which her lab work can produce no explanation.” 
Governor Martin O'Malley has issued a hold on applications to drill in western Maryland until the completion of a three-year study of hydraulic fracturing's environmental impacts, thus creating a de facto moratorium on hydraulic fracturing. Delegate Heather Mizeur plans to introduce a bill formally banning hydraulic fracturing in Maryland until state officials can determine whether it can be done without harming drinking water or the environment. The gas industry has refused to fund the three-year study and opposed a bill sponsored by Mizeur to fund the study with fees on gas drilling leases. The industry has objected to paying for any studies unless it receives guarantees that it will eventually be able to drill for gas.
In January 2012 Governor Chris Christie rejected a permanent ban on hydraulic fracturing in New Jersey. The New Jersey Legislature accepted Governor Chris Christie's alternative recommendation for a one-year ban on hydraulic fracturing instead. New Jersey does not have many shale reserves under the ground within its borders. In September 2012 New Jersey Governor Chris Christie vetoed Senate bill (S253) that had passed by a margin of 30-5. The bill would have banned the treatment, discharge, disposal or storage of hydraulic fracturing waste in New Jersey. Pennsylvania sends its waste to New Jersey companies interested in processing and disposing of waste water or "flowback" from hydraulic fracturing within the state. Christie claimed Senate bill (S253) would undercut the state’s ongoing study of hydraulic fracturing, and would discriminate against other states, a violation of the Dormant Commerce Clause of U.S. Constitution.
The New York State assembly voted 93 to 43, 30 November 2010, to place a moratorium or freeze on hydraulic fracturing to give the state more time to undertake safety and environmental concerns. A 2013 review focusing on Marcellus shale gas hydraulic fracturing and the New York City water supply stated, "Although potential benefits of Marcellus natural gas exploitation are large for transition to a clean energy economy, at present the regulatory framework in New York State is inadequate to prevent potentially irreversible threats to the local environment and New York City water supply. Major investments in state and federal regulatory enforcement will be required to avoid these environmental consequences, and a ban on drilling within the NYC water supply watersheds is appropriate, even if more highly regulated Marcellus gas production is eventually permitted elsewhere in New York State." In 2014, New York State banned hydraulic fracturing entirely, citing health risks.
In September 2012, the Cuomo administration decided to wait until it completes a review of the potential public health effects of hydraulic fracturing before it allows high-volume hydraulic fracturing in New York. State legislators, medical societies and health experts pressed Joseph Martens, commissioner of the State Department of Environmental Conservation, for an independent review of the health impacts of hydraulic fracturing by medical experts before any regulations are made final and drilling is allowed to start. Martens rejected commissioning an outside study. Instead, he appointed the health commissioner, Dr. Nirav Shah, to assess the department's analysis of the health effects closely and said Shah could consult qualified outside experts for his review.
At the municipal level, some towns and cities in central New York state have moved to regulate drilling by hydraulic fracturing and its attendant effects, either by banning it within municipal limits, maintaining the option to do so in the future, or banning wastewater from the drilling process from municipal water treatment plants.
New York City. The New York City watershed includes a large area of the Marcellus shale formation. The NYC Dept. of Environmental Protection's position: "While DEP is mindful of the potential economic opportunity that this represents for the State, hydraulic fracturing poses an unacceptable threat to the unfiltered water supply of nine million New Yorkers and cannot safely be permitted with the New York City watershed."
Niagara Falls. Niagara Falls' City Council approved an ordinance that prohibits natural gas extraction in Niagara Falls, as well as the "storage, transfer, treatment or disposal of natural gas exploration and production wastes." Elected officials there said that they didn't want their citizens, who experienced the Love Canal toxic waste crisis firsthand, to be guinea pigs for hydraulic fracturing, the new technology used in gas drilling operations. City council member, Glenn Choolokian said, “We won’t let the temptation of millions of dollars in reward for out-of-town companies, corporations and individuals to be the driving force that puts the health and lives of our children and families at risk from the dangers of hydraulic fracturing and its toxic water. I will not take part in bringing another Love Canal to the City of Niagara Falls.”“Our once great city and all the families of Niagara Falls have been through so much over the years. With Love Canal alive in our memories we aren’t going to allow another environmental tragedy to happen in our city, not today, not ever,” said Glenn Choolokian. Council Chairman Sam Fruscione said he was against selling out future generations of children for corporate greed. Rita Yelda of Food and Water Watch, pointed out that pollutants don't only affect Niagara's citizens, but those in communities downstream as well.
According to the Ohio Department of Natural Resources, approximately 80,000 oil and gas wells in Ohio have been hydraulically fractured since 1951. Ohio does not allow frac flowback or produced brine to be disposed of to surface streams; 98 percent of produced water is injected into Class II disposal wells, the remaining 2 percent is used for dust and ice control on roads, subject to local ordinances.
On May 24, 2012, House of Representatives of Ohio passed Senate Bill 315 regulating oil and gas drilling, including hydraulic fracturing. The bill requires companies to test water wells within 1,500 feet (460 m) of proposed drill sites and to report the fluids and chemicals used while drilling and fracking, except for those considered proprietary. Companies will also be required to track wastewater injected into disposal wells. According to John Funk of The Plain Dealer, the bill does not require complete disclosure of all chemicals used during drilling and hydraulic fracturing, and only requires any disclosure of chemicals after the well is already drilled. Proprietary formulas are protected. The Ohio Department of Natural Resources is allowed up to 60 days after drilling to post the chemicals on its website. Opponents had wanted the bill to require chemicals to be disclosed before drilling so that citizens could have their wells tested for baseline levels of contaminants. The Ohio Senate also removed the requirement for disclosure of drilling lubricants in the space below the local water table but above its final depth. The bill does not give the public the right to appeal a drilling permit, and does not require public notices of permits. The bill allows doctors to reveal the formula only to the patient, family and other doctors solely for the purpose of treatment, not in legal or other proceedings.
In May 2013, the Youngstown, Ohio city council turned down a proposed ban on fracking within city limits. The Niles, Ohio city council passed a fracking ban in August 2013, but unanimously rescinded the ban the following month, after testimony from labor union representatives.
Pennsylvania's Act 13  law on the one hand implements a Statewide regulation of hydraulic fracturing with the impact fee and on the other hand enshrines a really low standard of regulation preventing the possibilities for procedural justice and empowerment of local communities on the issue. Firstly, the law harmonizes the conditions for hydraulic fracturing regulations at the state level prohibiting local governments from legislating on the topic. It creates an impact fee for unconventional gas wells which benefits go to local counties and are to be used to tackle the effects of hydraulic fracturing locally. Nevertheless, the law has been widely criticized by environmentalists  for it prevents local governments from adopting tougher regulations of hydraulic fracturing activities. Indeed, zoning powers to decide where and when to allow hydraulic fracturing do not belong anymore to local authorities. The Pennsylvania Utility Commission has the power to invalidate any local ordinance conflicting with oil and gas operations. Hydraulic fracturing has to be authorized in all districts, comprising residential areas. Some chemicals are considered by the law as trade secret and information cannot be made public on their health effects. This bill, as well as most state-level regulations of hydraulic fracturing, has henceforth been seen as oriented towards the interests of the hydraulic fracturing industry against growing local concerns.
In 2011, President Obama and the governors of Maryland and Pennsylvania independently formed committees to provide advice about all aspects of fracking. However, a study conducted on the advisory committees of the Marcellus Shale gas area has shown that not a single member of these committees had public health expertise and that some concern existed about whether the commissions were not biased in their composition. Indeed, among 51 members of the committees, there is no evidence that a single one has any expertise in environmental public health, even after enlarging the category of experts to “include medical and health professionals who could be presumed to have some health background related to environmental health, however minimal”. This cannot be explained by the purpose of the committee since all three executive orders of the different committees mentioned environmental public health related issues. Another finding of the authors is that a quarter of the opposed comments mentioned the possibility of bias in favor of gas industries in the composition of committees. The authors conclude saying that political leaders may not want to raise public health concerns not to handicap further economic development due to fracking.
Marcellus Shale Drilling Permits
The Marcellus Center at Pennsylvania State University reports that the number of permits issued for wells has increased from 122 in 2007 to 3249 in 2011. The Marcellus Center has posted an animated map of the proliferation of Marcellus Shale Drilling Permits in Pennsylvania. Another map displays both wells and waste processing centers. The bulk of waste from hydraulic fracturing in Pennsylvania is disposed of or used within the state. Not all companies submit reports on production or waste.
In November 2012 the PA DEP was again accused of withholding information about chemicals from hydraulic fracturing fluid that were found in residents' drinking water. The DEP had previously failed to notify residents about hydraulic fracturing related contamination events. In 2013, under pressure from the Corbett administration, the PADEP attempted to suppress negative information about the impact of hydraulic fracturing in the state's shade plays from a mandated report on climate change. Members of the Corbett administration wanted all references to a 2011 Cornell University study by Howarth removed from the report. Corbett received over a million dollars in campaign contributions from the oil and gas industry.
The Marcellus Shale Law (House Bill 1950)
The Marcellus Shale Law (House Bill 1950) was signed on February 14, 2012, by Governor Tom Corbett. Despite warnings from the EPA about the safety of wastewater, the law changes the zoning laws applicable to Marcellus Shale Well Drilling. The law was slated to take effect in April 2012, but legal challenges from a growing group of Pennsylvania municipalities and organizations led Commonwealth Senior Judge Keith Quigley to order that the implementation of parts of Act 13 be delayed for 120 days. Some of its provisions are that all municipalities must allow Marcellus Shale well drilling (in all zoning districts, including residential and may not limit hours of operation), water and wastewater pits (in all zoning district, including residential), compressor stations (in industrial and agricultural zoning districts and may not limit hours of operation), gas processing plants (in industrial zoning districts and cannot limit hours of operation), and gas pipelines (in all zoning districts, including residential). The law helps pave the way for a new pipeline across Pennsylvania to export terminals in Maryland.
The Marcellus Shale Law also contains a provision that allows doctors access to the list of chemicals in hydraulic fracturing fluid in emergency situations, but forbids them from discussing this information with their patients. This provision was added during the last revisions of the bill. Specifically, the bill reads that, "(11) If a health professional determines that a medical emergency exists and the specific identity and amount of any chemicals claimed to be a trade secret or confidential proprietary information are necessary for emergency treatment, the vendor, service provider or operator shall immediately disclose the information to the health professional upon a verbal acknowledgment by the health professional that the information may not be used for purposes other than the health needs asserted and that the 'health professional shall maintain the information as confidential.' The vendor, service provider or operator may request, and the health professional shall provide upon request, a written statement of need and a confidentiality agreement from the health professional as soon as circumstances permit, in conformance with regulations promulgated under this chapter." The bill also says that vendors, service providers, and operators cannot be held responsible for inaccuracy in information that is provided to them, nor do they have to reveal the identities of chemicals that are not disclosed to them, that were not intentionally added to the hydraulic fracturing fluid, that are accidentally present in trace amounts, or are a product of a chemical reaction or process that occurs within the fluid.
The EPA is increasing its oversight regarding investigations of hydraulic fracturing in Pennsylvania, which is currently under the administration of pro-drilling Governor Tom Corbett. The New York Times reported that regulations are lax in Pennsylvania. The oil and gas industry is generally left to police itself in the case of accidents. Unannounced inspections are not made by regulators: the companies report their own spills, and create their own remediation plans. A recent review of the state-approved plans found them to appear to be in violation of the law. There are signs of regulatory capture. As noted previously, Corbett received over a million dollars in campaign contributions from the oil and gas industry. Ronald Krancer, father of 2012 Pennsylvania DEP Secretary Michael Krancer, donated $25,000 to the State Republican Committee the day before his son was confirmed as the new Department of Environmental Protection Secretary. In addition, Michael Krancer's father contributed $150,000 to Governor Corbett's campaign, tens of thousands to GOP Bob Asher's political action committee and at least $125,000 to the state Republican Party since 2008.
Denton, Texas held a referendum to on whether to ban hydraulic fracturing on November 4, 2014. The ban received 59% support and the city became the first in Texas to ban fracking. The fight between the two sides was strong: the anti-ban group 'Denton Taxpayers for a Strong Economy raised nearly $700,000 to campaign against the ban, most of it from gas and oil companies XTO Energy, Devon Energy and Enervest. The pro-ban group Frack Free Denton raised $75,000, $40,000 from the national advocacy group Earthworks Action.
In May 2015, the Texas state legislature passed HB40, signed by Texas governor Greg Abbott, making local fracking bans illegal.[better source needed] In response, the Denton City Council repealed the ban in June 2015.
Vermont's Act 152 has banned hydraulic fracturing in the exploitation and exploration of unconventional oil and gas as long as it is not demonstrated that it has no impact on the environment or public health.
Although there has been no oil or gas production or hydraulic fracturing in the state, the Vermont House of Representatives passed a moratorium on hydraulic fracturing in February 2012, and on May 17, 2012 Governor Peter Shumlin (Democrat) signed the law making Vermont the first state to ban hydraulic fracturing. On Friday, May 4, 2012, the Vermont legislature voted 103-36 to ban hydraulic fracturing in the state. The bill also requires the state's regulations be revised to prohibit injection well operators from accepting oil and natural gas drilling waste water from out of state.
Media and public relations
The opposition against fracking activities in local townships has led companies to adopt a variety of public relations measures to assuage fears about fracking, including the admitted use of "military tactics to counter drilling opponents". At a conference where public relations measures were discussed, a senior executive at Anadarko Petroleum was recorded on tape saying, "Download the US Army / Marine Corps Counterinsurgency Manual, because we are dealing with an insurgency", while referring to fracking opponents. Matt Pitzarella, spokesman for the most important fracking company in Pennsylvania, Range Resources, also told other conference attendees that Range employed psychological warfare operations veterans. According to Pitzarella, the experience learnt in the Middle East has been valuable to Range Resources in Pennsylvania, when dealing with emotionally charged township meetings and advising townships on zoning and local ordinances dealing with fracking. Furthermore, in a February 2012 campaign speech, Rick Santorum, a candidate for the 2012 Republican Party presidential nomination, referred to those objecting to hydraulic fracturing as environmental terrorists.
- Energy in the United States
- Environmental Defense Fund
- Marcellus natural gas trend
- Shale gas in the United States
- Mark S. Guralnick
- Montgomery, Carl T.; Smith, Michael B. (2010-12-10). "Hydraulic fracturing. History of an enduring technology" (PDF). JPT Online. Society of Petroleum Engineers: 26–41. Archived from the original (PDF) on November 14, 2012. Retrieved 22 September 2014.
- US Dept. of Energy, How is shale gas produced?, Apr. 2013.
- Marie Cusick (August 27, 2013). "DEP Attempted To Suppress Controversial Study That Criticized Shale Gas". State Impact Pennsylvania. NPR. Retrieved October 19, 2013.
- Urbina, Ian (August 3, 2011). "A Tainted Water Well, and Concern There May be More". The New York Times. Retrieved February 22, 2012.
- Fox, Josh (June 18, 2010). "New Film Investigates 'Fracking' For Natural Gas". Science Friday (Interview). Interview with Ira Flatow. Washington, D.C.: WAMU. Retrieved June 21, 2010.
- Margot Roosevelt (June 18, 2010). "Gulf oil spill worsens -- but what about the safety of gas fracking?". LA Times. Retrieved June 21, 2010.
- "EPA Announces a Schedule of Public Meetings on Hydraulic Fracturing Research Study". United States Environmental Protection Agency. June 21, 2010. Retrieved June 21, 2010.
- "FracTracker's Mapping Tool". March 17, 2011. Retrieved October 6, 2012.
- "APNewsBreak: EPA theorizes fracking-pollution link". United States Environmental Protection Agency. December 8, 2011. Retrieved December 9, 2011.
- Watson, Thomas L. (1910), Granites of the southeastern Atlantic states (PDF), U.S. Geological Survey Bulletin (426), retrieved 22 September 2014[page needed]
- Charlez, Philippe A. (1997). Rock Mechanics: Petroleum Applications. Paris: Editions Technip. p. 239. Retrieved May 14, 2012.
- Zaffarano, R.F.; Lankford, J.D. "Petroleum and natural gas". Mineral Facts and Problems: 1965 Edition. Washington, D.C.. UNT Digital Library: US Bureau of Mines, Bulletin 630. p. 673. Retrieved 22 September 2014.
- Ben E. Law and Charles W. Spencer, 1993, "Gas in tight reservoirs-an emerging major source of energy," in David G. Howell (ed.), The Future of Energy Gases, US Geological Survey, Professional Paper 1570, p.233–252.
- C.R. Fast, G.B. Holman, and R. J. Covlin, "The application of massive hydraulic fracturing to the tight Muddy 'J' Formation, Wattenberg Field, Colorado," in Harry K. Veal, (ed.), Exploration Frontiers of the Central and Southern Rockies (Denver: Rocky Mountain Association of Geologists, 1977) 293-300.
- Russ Rountree, "Rocky Mountain Oil History," Western Oil Reporter, v.41 n.10, Oct. 1984, p.77.
- Robert Chancellor, "Mesaverde hydraulic fracture stimulation, northern Piceance Basin - progress report," in Harry K. Veal, (ed.), Exploration Frontiers of the Central and Southern Rockies (Denver: Rocky Mountain Association of Geologists, 1977) 285-291.
- US Environmental Protection Agency, Evaluation of Impacts to Underground Sources of Drinking Water by Hydraulic Fracturing of Coalbed Methane Reservoirs, EPA 816-R-04-003 (2004) p3-11, 5-14.
- Stephen Holditch, Applying North American experience to the rest of the world, Texas A&M Univ.
- “Giddings comes full circle,” E&P Magazine, 4 Sept. 2012.
- C.E Bell and others, Effective diverting in horizontal wells in the Austin Chalk, Society of Petroleum Engineers conference paper, 1993.
- E. O. Ray, Shale development in eastern Kentucky, US Energy Research and Development Administration, 1976.
- United States National Research Council; Committee to Review the Gas Research Institute's Research; Development Demonstration Program; Gas Research Institute (1989). A review of the management of the Gas Research Institute. National Academies.
- Robbins, Kalyani (2013). "Awakening the Slumbering Giant: How Horizontal Drilling Technology Brought the Endangered Species Act to Bear on Hydraulic Fracturing" (PDF). Case Western Reserve Law Review. 63 (4). Archived from the original (PDF) on 2014-03-26. Retrieved 2016-09-18.
- Gold, Russell (2014). The Boom: How Fracking Ignited the American Energy Revolution and Changed the World. New York: Simon & Schuster. pp. 115–121. ISBN 978-1-4516-9228-0.
- Zukerman, Gregory (2013-11-06). "Breakthrough: The Accidental Discovery That Revolutionized American Energy". The Atlantis. Retrieved 2016-09-18.
- "US Government Role in Shale Gas Fracking: An Overview"
- SPE production & operations. 20. Society of Petroleum Engineers. 2005. p. 87.
- The Breakthrough Institute. Interview with Dan Steward, former Mitchell Energy Vice President. December 2011.
- Zuckerman, Gregory (2013-11-15). "How fracking billionaires built their empires". Quartz. The Atlantic Media Company. Retrieved 15 November 2013.
- "Shale of the century". The Economist (June 2, 2012). Retrieved June 2, 2012.
- Hallibuton, Hydraulic fracturing 101.
- Ground Water Protection Council and ALL Consulting (April 2009). Modern shale gas development in the United States: A primer (PDF). U.S. Department of Energy, Office of Fossil Energy; and National Energy Technology Laboratory. Retrieved 8 October 2014.
- Rowland, Sebastian (29 May 2012). "EPA Releases Draft Guidelines on Fracking Permits". RegBlog. University of Pennsylvania Law School. Penn Program on Regulation. Retrieved 8 October 2014.
- "Constructing your well" (PDF). Land & Water: Conserving Natural Resources in Illinois. University of Illinois Extension - College of Agricultural, Consumer and Environmental Sciences (16). September 2007. Retrieved 8 October 2014.
- Moniz (chair), Ernest J.; Jacoby (Co-Chair), Henry D.; Meggs (Co-Chair), Anthony J. M. (June 2011). The future of natural gas: An interdisciplinary MIT study (PDF). Massachusetts Institute of Technology. Retrieved 8 October 2014.
- Fracking Growth - Estimating the Economic Impact of Shale Oil and Gas Development in the US, Fetzer, Thiemo (2014)
- Dutch Disease or Agglomeration? The Local Economic Effects of Natural Resource Booms in Modern America, Alcott and Kenniston (2013)
- "The housing market impacts of shale gas development", by Lucija Muehlenbachs, Elisheba Spiller and Christopher Timmins. NBER Working Paper 19796, January 2014.
- AEO2013 Early Release Overview (PDF) (Report). U.S. Energy Information Administration. Retrieved 17 September 2014.
- National Petroleum Council, Prudent Development: Realizing the Potential of North America’s Abundant Natural Gas and Oil Resources, 15 September 2011.
- IHS Global Insight, Measuring the Economic and Energy Impacts of Proposals to Regulate Hydraulic Fracturing, 2009.
- US Energy Information Administration, United States Annual Energy Outlook 2012, p.208.
- US Energy Information Administration, Natural gas imports
- Adam Sieminski, U.S. Energy Outlook, US Energy Information Administration, 14 Mar. 2013, p.12.
- Jad Mouwad, Fuel to burn: now what?, New York Times, April 2012.
- Fracking pushes US crude output to highest level since 1989, Bloomberg, 11 Sept. 2013.
- Danny Fortson (September 11, 2011). "America to be No 1 oil producer". The Sunday Times. Retrieved March 4, 2012.
Goldman Sachs, the investment bank, has predicted that US production will hit 10.9m barrels a day by 2017, a one-third rise over its current level of 8.3m barrels a day. . . . Jeffrey Currie, Goldman's head of commodities, said the reversal of fortune for America was a combination of "technological innovation, as shale technologies developed in gas were applied to oil, and a surge of investment into the US oil industry".
- Paul Ames (30 May 2013). "Could fracking make the Persian Gulf irrelevant?". GlobalPost via Salon. Retrieved May 30, 2012.
- Rich Miller; Asjylyn Loder; Jim Polson (February 7, 2012). "Americans Gaining Energy Independence With U.S. as Top Producer". Bloomberg. Retrieved February 21, 2012.
- Benoit Faucon and Sarah Kent, "IEA pegs U.S. as top producer by 2020," Wall Street Journal, 12 Nov. 2012.
- US EIA, U.S. to become world's leading producer of oil and gas hydrocarbons in 2013, 4 October 2013.
- "World Energy Outlook 2011: Are We Entering a Golden Age of Gas?" (PDF). International Energy Agency. November 9, 2011. Retrieved March 3, 2012.
Based on the assumptions of the GAS Scenario, from 2010 gas use will rise by more than 50% and account for over 25% of world energy demand in 2035—surely a prospect to designate the Golden Age of Gas.
- Polson, Jim; Haas, Benjamin (January 4, 2012). "Sinopec Group to Buy Stakes in Devon Energy Oil Projects". Bloomberg Businessweek. Retrieved February 4, 2014.
- Carroll, Joe; Polson, Jim (January 9, 2012). "U.S. Shale Bubble Inflates After Near-Record Prices for Untested Fields". Bloomberg Businessweek. Retrieved February 4, 2014.
- Scott, Mark (October 17, 2011). "Norway's Statoil to Acquire Brigham Exploration for $4.4 Billion". Dealb%k. New York Times. Retrieved March 4, 2012.
- "Production Decline of a Natural Gas Well Over Time". Geology.com. The Geology Society of America. January 3, 2012. Retrieved March 4, 2012.
- Urbina, Ian (June 25, 2011). "Insiders Sound an Alarm Amid a Natural Gas Rush". New York Times. Retrieved June 28, 2011.
- Urbina, Ian (June 27, 2011). "S.E.C. Shift Leads to Worries of Overestimation of Reserves". New York Times. Retrieved June 28, 2011.
- Arthur S. Brisbane, “Clashing views on the future of natural gas,” New York Times, 16 July 2001.
- Global Macroeconomics Team. "The wide gap between U. S. natural gas prices and European natural gas and crude oil prices suggests downside risks on oil prices". Prospects Weekly. The World Bank Group. Archived from the original on November 27, 2012. Retrieved 15 September 2014.
- Editorial (February 16, 2012). "Energy Independence Gives Opening for Renewables". Bloomberg. Retrieved February 21, 2012.
- McAllister, Edward (March 7, 2012). "Show, don't tell: U.S. natural gas traders question cuts. North American natural gas producers face one big problem as they pledge to cut production to bolster prices: skeptical traders.". Reuters. Retrieved March 8, 2012.
- "LNG exports: Marcellus Shale goes global". StateImpact Pennsylvania. WITF. Retrieved 16 September 2014.
- Asian Refiners Get Squeezed by U.S. Energy Boom, Wall Street Journal, 1 January 2014
- Taraska, Gwynne. "U.S. Liquefied Natural Gas Exports: A Primer on the Process and the Debate". Energy and Environment. Center for American Progress. Retrieved 15 September 2014.
- "Free Trade Agreements". Office of the United States Trade Representative. USA.gov. Retrieved 15 September 2014.
- Rascoe, Ayesha (February 7, 2012). "Sierra Club opposes Maryland LNG export terminal". Reuters. Retrieved February 4, 2014.
- Gies, Erica (February 24, 2012). "Push to Export Natural Gas Could Threaten U.S. Energy Security". Green Tech. Forbes. Retrieved February 4, 2014.
- Maykuth, Andrew (2 March 2012). "$1B Marcellus pipeline proposed". The Philadelphia Inquirer. Retrieved 16 September 2014.
- Barnhardt, Laura (April 19, 2006). "Firm to hold meetings on LNG pipeline plan". Baltimore Sun. Retrieved March 6, 2012.
- Prezioso, Jeanine (July 28, 2011). "Analysis: U.S. shale gas sector girds for next battle: pipeline". Reuters. Retrieved March 6, 2012.
- "Hydraulic Fracturing Study Plan Draft 2011" (PDF). Environmental Protection Agency's Hydraulic Fracturing Study Plan Draft 2011. Environmental Protection Agency. Retrieved May 3, 2011.
- King, Hobart. "Mineral Rights: Basic information about mineral, surface, oil and gas rights". Geology.com. Retrieved 9 October 2014.
- Whittmeyer, Hannah (17 June 2013). "Mineral rights & fracking". frackwire. Retrieved 13 October 2014.
- Conlin, Michelle; Grow, Brian (9 October 2013). "They own the house but not what lies beneath" (PDF). Thomson Reuters. Retrieved 9 October 2014.
- Ian Urbina; Jo Craven McGinty (December 1, 2011). "Learning Too Late of the Perils in Gas Well Leases". The New York Times. Retrieved February 23, 2012.
- Lovejoy, Wallace F.; Homan, Paul T. (2011). Economic aspects of oil conservation regulation. Hoboken: Taylor and Francis. ISBN 9781135985462.
- Peters, Andy (13 October 2014). "Fracking Boom Gives Banks Mortgage Headaches". American Banker. Retrieved 13 October 2014.
- Ian Urbina (October 19, 2011). "Rush to Drill for Natural Gas Creates Conflicts With Mortgages". The New York Times. Retrieved February 23, 2012.
- Ian Urbina (November 24, 2011). "Officials Push for Clarity on Oil and Gas Leases". The New York Times. Retrieved February 23, 2012.
- Mary Esch; Rik Stevens (July 13, 2012). "U.S. insurer won't cover gas drill fracking exposure". Associated Press. Retrieved July 14, 2012.
- Chemicals Used in Hydraulic Fracturing (PDF) (Report). Committee on Energy and Commerce U.S. House of Representatives. April 18, 2011.
- Brown, Valerie J. (February 2007). "Industry Issues: Putting the Heat on Gas". Environmental Health Perspectives (115(2).). US National Institute of Environmental Health Sciences.
- "Incidents where hydraulic fracturing is a suspected cause of drinking water contamination are suspected of non science". U.S. NRDC. December 2011. Retrieved February 23, 2012.
- Ian Urbina (March 3, 2011). "Pressure Limits Efforts to Police Drilling for Gas". The New York Times. Retrieved February 23, 2012.
- David Biello (March 30, 2010). "What the Frack? Natural Gas from Subterranean Shale Promises U.S. Energy Independence--With Environmental Costs". Scientific American. Retrieved February 21, 2012.
- Daphne Wysham (February 6, 2012). "Fracking Perils: A Dangerous Misstep on the Road to U.S. Energy Independence". Common Dreams. Retrieved February 22, 2012.
- Ramanuja, Krishna (March 7, 2012). "Study suggests hydrofracking is killing farm animals, pets". Cornell Chronicle Online. Cornell University. Retrieved March 9, 2012.
- "Chapter 5 Natural Gas Development Activities And High‐Volume Hydraulic Fracturing" (PDF). New York Department of Environmental Conservation. June 2010.
- Hass, Benjamin (14 August 2012). "Fracking Hazards Obscured in Failure to Disclose Wells". Bloomberg News. Retrieved March 27, 2013.
- Soraghan, Mike (13 December 2013). "White House official backs FracFocus as preferred disclosure method". E&E News. Retrieved March 27, 2013.
- "Colorado Sets The Bar on Hydraulic Fracturing Chemical Disclosure". Environmental Defense Fund. Retrieved March 27, 2013.
- Maykuth, Andrew (22 January 2012). "More states ordering disclosure of fracking chemicals.". Philadelphia Inquirer. Retrieved March 27, 2013.
- Grant, Alison (4 April 2013). "FracTracker monitors shale development in Ohio". The Plain Dealer. Retrieved July 28, 2013.
- Staff. "FracTracker. Exploring data, sharing perspectives, and mapping impacts of the gas industry". FracTracker. Retrieved July 28, 2013.
- "Assessment of the Potential Impacts of Hydraulic Fracturing for Oil and Gas on Drinking Water Resources Executive Summary" (PDF). www.epa.gov.
- Environmental and Energy Study Institute. "Transatlantic Perspectives on Shale Gas Development".
- U.S. EPA. "Case Study Locations for Hydraulic Fracturing Study".
- Ikeda, Robin (April 26, 2013). "Review of Federal Hydraulic Fracturing Research Activities. Testimony before the Subcommittees on Energy and Environment Committee on Science, Space and Technology U.S. House of Representatives.". CDC Washington. US Center for Disease Control and Prevention. Retrieved May 11, 2013.
- "Assessment of the Potential Impacts of Hydraulic Fracturing for Oil and Gas on Drinking Water Resources (External Review Draft)".
- DiCosmo, Bridget (May 15, 2012). "SAB Pushes To Advise EPA To Conduct Toxicity Tests In Fracking Study". InsideEPA. US Environmental Protection Agency. Retrieved May 19, 2012.
But some members of the chartered SAB are suggesting that the fracking panel revise its recommendation that the agency scale back its planned toxicity testing of chemicals used in the hydraulic fracturing, or fracking, process, because of the limited resources and time frame...Chesapeake Energy supported the draft recommendation, saying that “an in-depth study of toxicity, the development of new analytical methods and tracers are not practical given the budget and schedule limitation of the study.”
- Deborah L. Swackhamer and David Dzomback, SAB review of EPA's draft hydraulic fracturing study plan, 4 Aug. 2011.
- Satterfield, John (June 30, 2011). "Letter from Chesapeake Energy to EPA" (PDF). InsideEPA. US Environmental Protection Agency. Retrieved May 19, 2012.
- Timothy A. Bartrand; Jeffrey S. Rosen (October 2013). Potential Impacts and Significance of Elevated 131 I on Drinking Water Sources [Project #4486]ORDER NUMBER: 4486 (PDF) (Report). Water Research Foundation. Retrieved November 11, 2013.
- Jeff McMahon (April 10, 2011). "EPA: New Radiation Highs in Little Rock Milk, Philadelphia Drinking Water". Forbes. Retrieved February 22, 2012.
- "Japanese Nuclear Emergency: Radiation Monitoring". EPA. June 30, 2011. Retrieved February 23, 2012.
- Sandy Bauers (July 21, 2011). "Cancer patients' urine suspected in Wissahickon iodine-131 levels". Philadelphia inquirer, Carbon County Groundwater Guardians. Retrieved February 25, 2012.
-  Scott III, George L. (03-June-1997) US Patent No. 5635712: Method for monitoring the hydraulic fracturing of a subterranean formation. US Patent Publications.
-  Fertl; Walter H. (15-Nov-1983) US Patent No. US4415805: Method and apparatus for evaluating multiple stage fracturing or earth formations surrounding a borehole. US Patent Publications.
-  Scott III, George L. (15-Aug-1995) US Patent No. US5441110: System and method for monitoring fracture growth during hydraulic fracture treatment. US Patent Publications.
- Draft Plan to Study the Potential Impacts of Hydraulic Fracturing on Drinking Water Resources
- Andrews, Anthony; et al. (30 October 2009). Unconventional Gas Shales: Development, Technology, and Policy Issues (PDF) (Report). Congressional Research Service. pp. 7; 23. Retrieved 22 February 2012.
- Abdalla, Charles W.; Drohan, Joy R. (2010). Water Withdrawals for Development of Marcellus Shale Gas in Pennsylvania. Introduction to Pennsylvania’s Water Resources (PDF) (Report). The Pennsylvania State University. Retrieved 16 September 2012.
Hydrofracturing a horizontal Marcellus well may use 4 to 8 million gallons of water, typically within about 1 week. However, based on experiences in other major U.S. shale gas fields, some Marcellus wells may need to be hydrofractured several times over their productive life (typically five to twenty years or more)
- Ground Water Protection Council; ALL Consulting (April 2009). Modern Shale Gas Development in the United States: A Primer (PDF) (Report). DOE Office of Fossil Energy and National Energy Technology Laboratory. pp. 56–66. DE-FG26-04NT15455. Retrieved 24 February 2012.
- Arthur, J. Daniel; Uretsky, Mike; Wilson, Preston (May 5–6, 2010). Water Resources and Use for Hydraulic Fracturing in the Marcellus Shale Region (PDF). Meeting of the American Institute of Professional Geologists. Pittsburgh: ALL Consulting. p. 3. Retrieved 2012-05-09.
- Cothren, Jackson. Modeling the Effects of Non-Riparian Surface Water Diversions on Flow Conditions in the Little Red Watershed (PDF) (Report). U. S. Geological Survey, Arkansas Water Science Center Arkansas Water Resources Center, American Water Resources Association, Arkansas State Section Fayetteville Shale Symposium 2012. p. 12. Retrieved 16 September 2012.
...each well requires between 3 and 7 million gallons of water for hydraulic fracturing and the number of wells is expected to grow in the future
- Ridlington, Elizabeth; John Rumpler (October 3, 2013). "Fracking by the numbers". Environment America.
- Lubber, Mindy (28 May 2013). "Escalating Water Strains In Fracking Regions". Forbes. Retrieved 20 October 2013.
- Ridlington, Rumpler "Fracking by the numbers: key impact of dirty drilling at the state and national level", Environment America, October 2013[unreliable source?]
- Gas eruption fallout, The River Reporter, June 10–16, 2010
- Anya Litvak, Marcellus Shale well blowout prompts second DEP suspension, Pittsburgh business Times, June 9, 2010.
- Casselman, Ben (August 13, 2009). "Wastewater Disposal Well May Have Caused Texas Earthquakes". Wall Street Journal. Retrieved May 8, 2011.
- "Drilling Might Be Culprit Behind Texas Earthquakes". Associated Press. June 12, 2009.
- Caroline Zilk, “Permanent disposal-well moratorium issued”, Arkansas Online, 31 July 2011.
- Arkansas Oil and Gas Commission, “Permanent disposal well moratorium area, 20 Jun. 2011.
- Joyce, Christopher, How Fracking Wastewater Is Tied To Quakes, National Public Radio, January 5, 2012.
- David Brown, "Dispelling myths about seismicity," AAPG Explorer, Oct. 2015.
- "Earthquakes in Oklahoma". Office of the Oklahoma Secretary of Energy and Environment. Oklahoma City, Oklahoma: Government of Oklahoma. April 21, 2015. Retrieved April 24, 2015.
- "Earthquakes in Oklahoma: What We Know". Office of the Oklahoma Secretary of Energy and Environment. Oklahoma City, Oklahoma: Government of Oklahoma. April 21, 2015. Retrieved April 24, 2015.
- "Earthquakes in Oklahoma of M3+" (PNG). Earthquake Hazards Program. United States Geological Survey. September 24, 2014. Retrieved April 24, 2015.
- J. Geertsma, “Land subsidence above compacting oil and gas reservoirs, Journal of Petroleum Technology, June 1973, v.25 n.6 p.734-743.
- Department of Energy and Climate Change, Fracking UK Shale: Understanding Earthquakes Risk, Feb. 2014.
- McHaney, Sarah (October 21, 2012). "Shale Gas Extraction Brings Local Health Impacts". IPS News. Inter Press Service. Retrieved October 21, 2012.
- "Oil and Gas Air Pollution". Earthworks. Retrieved May 8, 2011.[unreliable source]
- Hanson, Hilary (January 12, 2013). "WATCH: Home Has Flammable Tap Water". Huffington Post.
- Rabinowitz, P.M., et al. (2014) "Proximity to Natural Gas Wells and Reported Health Status: Results of a Household Survey in Washington County, Pennsylvania" Environ Health Perspect DOI:10.1289/ehp.1307732[unreliable medical source?][non-primary source needed]
- Johnsen, Reid; LaRiviere, Jacob; Woff, Hendrik. "Estimating indirect benefits: Fracking, coal and air pollution" (PDF). Retrieved 10 November 2016.
- Finkel; Hays (2015). "Environmental and health impacts of 'fracking': why epidemiological studies are necessary.". Epidemiol Community Health. 70 (3): 221–222. doi:10.1136/jech-2015-205487.
- "REPORT: Five Major Health Threats from Fracking-Related Air Pollution [Press Release].". National Resource Defense Council.
- "Worker Exposure to Silica during Hydraulic Fracturing.". The National Institute for Occupational Safety and Health.
- Year, B. "Health Concerns for Silica in Outdoor Air.".
- Glauser, Wendy (2014). "New legitimacy to concerns about fracking and health". CMAJ : Canadian Medical Association Journal. 186 (6): E245–E246. doi:10.1503/cmaj.109-4725.
- McKenzie; Guo; Witter; Savitz; Newman; Adgate (April 2014). "Birth Outcomes and Maternal Residential Proximity to Natural Gas Development in Rural Colorado.". Environmental Health Perspectives: Children's Health,. 122 (4). doi:10.1289/ehp.1306722.
- "REPORT: Five Major Health Threats from Fracking-Related Air Pollution [Press Release].". National Resource Defense Council. Retrieved 22 October 2016.
- Kron, A (2015). "EPA's Role in Implementing and Maintaining the Oil and Gas Industry's Environmental Exemptions: A Study in Three Statutes." (PDF). Vermont Journal of Environmental Law. 16 (4): 586. doi:10.2307/vermjenvilaw.16.4.586.
- Hoffman, J. "Potential Health and Environmental Effects of Hydrofracking in the Williston Basin, Montana.". Retrieved 26 October 2016.
- "Worker Exposure to Silica during Hydraulic Fracturing". OSHA. Retrieved 15 January 2013.
- Eric Esswein, MSPH; Max Kiefer, MS; John Snawder; Michael Breitenstein, BS (23 May 2012). "Worker Exposure to Crystalline Silica During Hydraulic Fracturing". NIOSH Science Blog. United States Center for Disease Control. Retrieved September 8, 2012.
- Gayle Nicoll (October 1, 2012). "Radiation Sources in Natural Gas Well Activities. More attention and monitoring of occupational radiation exposure in the natural gas industry are warranted". Occupational Health and Safety. Retrieved October 6, 2012.
- RegBlog (August 18, 2015). "Legal Challenges to Fracking Regulation". Retrieved October 22, 2015.
- Rubinkam M, Esch M. (September 10, 2010). Lawsuit: Gas drilling fluid ruined Pennsylvania water wells. AP.
- Associated Press (June 27, 2011). "Company sues W.Va town over drilling ban". Bloomberg Businessweek. Retrieved June 28, 2011.
- Pless, Jacquelyn. "Fracking Update: What States Are Doing to Ensure Safe Natural Gas Extraction". National Conference of State Legislatures. Retrieved 15 September 2014.
- Negro, Sorrell E. (February 2012). "Fracking Wars: Federal, State, and Local Conflicts over the Regulation of Natural Gas Activities" (PDF). Zoning and Planning Law Report. Thomson Reuters. 35 (2): 1–14. Retrieved 2014-05-01.
- "Fracking disclosure rules", Trade Secrets Watch, October 2013
- Kiparsky, Michael; Hein, Jayni Foley (April 2013). "Regulation of Hydraulic Fracturing in California: A Wastewater and Water Quality Perspective" (PDF). University of California Center for Law, Energy, and the Environment. Retrieved 2014-05-01.
- Freeman, Jody (July 5, 2012). "The Wise Way to Regulate Gas Drilling". New York Times. Retrieved October 19, 2012.
- Eggert, David (October 19, 2012). "Yes or No? Obama, Romney answer 'fracking' question". Retrieved October 19, 2012.
- Karlin, Rick (July 31, 2012). "Gas drilling firm threatens to sue over potential frack bans". Retrieved October 19, 2012.
- Nicholson, Barclay; Blanson, Kadian (December 5, 2012). "Trends emerge on hydraulic fracturing litigation". Retrieved October 19, 2012.
- "Regulation of Hydraulic Fracturing Under the Safe Drinking Water Act". Water. United States Environmental Protection Agency. Retrieved 10 October 2014.
- State Review of Oil and Gas Environmental Regulations, home page
- Davis C and Hoffer K "Federalizing energy? Agenda change and the politics of tracking", Policy Science, Volume 45, September 2012
- , Environmental Protection Agency
- "Did the 11th Ciurcuit Crack "Frac"? – Hydraulic Fracturing after the Court's Landmark LEAF Decision". Virginia Environmental Law Journal. 18 (4). 1999.
- "Does Natural-Gas Drilling Endanger Water Supplies?". BusinessWeek. November 11, 2008.
- "Hydraulic Fracturing (Fracking)". Environment and Natural Resources. National Conference of State Legislatures. Retrieved 22 September 2014.
- Letter from Representatives Henry A. Waxman, Edward J. Markey, Diana DeGette, and Rush Holt to EPA Administrator Lisa Jackson, 8 August 2011
- Mulkern, Anne C. (May 7, 2009). "Industry campaign targets 'hydraulic fracturing' bill". The New York Times. Retrieved May 4, 2010.
- Colman, Zack (November 30, 2012). "GOP lawmakers say fracking study could hurt job growth". The Hill (E2 Wire). Retrieved February 4, 2014.
- Staff (30 November 2012). "Lawmakers fear Kathleen Sebelius taking aim at natural gas boom". Beltway Confidential. The Examiner. Retrieved December 1, 2012.
- Wayne, Alex; Klimasinska, Katarzyna (January 4, 2012). "Health Effects of Fracking for Natural Gas Need Study, Says CDC Scientist". Bloomberg. Retrieved February 4, 2014.
- H.R. 1084: S. 587: FRAC Act
- H.R. 1084: Fracturing Responsibility and Awareness of Chemicals Act of 2011
- "H.R. 1084: Fracturing Responsibility and Awareness of Chemicals Act of 2011". GovTrack.us. Retrieved March 9, 2012.
- "S. 587: FRAC Act". GovTrack.us. Retrieved March 9, 2012.
- "Oil & Gas: Money to Congress". OpenSecrets.org. Retrieved March 9, 2012.
- U.S. proposes new rules for fracking on federal lands. Reuters.
- Litvak, Anya (20 April 2011). "A new home for Marcellus Shale frac water".
- Mireya Navarro (12 July 2011). "Fracking Water Killed Trees, Study Finds". Green. The New York Times. Retrieved February 22, 2012.
- Draft Supplemental Generic Environmental Impact Statement. Chapter 5 Natural Gas Development Activities And High‐Volume Hydraulic Fracturing.
- Suddes, Thomasn (January 14, 2012). "'Fracking' debate exposes weaknesses in Ohio Statehouse – term limits and the death of home rule". The Plain Dealer. Retrieved March 26, 2012.
- "Recent Court Decisions May Affect Hydraulic Fracturing in New York and Ohio". The National Law Review. McDermott Will & Emery. April 1, 2012. Retrieved July 3, 2012.
- "Motion for a fracking moratorium"
- Hiltzik, Michael (9 June 2012). "Let's close the information gap about fracking. The oil and gas industry wanted to withhold information even from regulators about the exact formulation of the fluids injected into the ground during fracking, calling them trade secrets.". Los Angeles Times. Retrieved June 9, 2012.
- California lawmakers approve fracking bill, NBC Bay Area, 12 Sept. 2013.
- Bernstein, Sharon. "California Fracking Bill Signed Into Law By Governor Jerry Brown." The Huffington Post. TheHuffingtonPost.com, 21 Sept. 2013. Web. 02 Mar. 2014.<http://www.huffingtonpost.com/2013/09/21/california-fracking-bill_n_3965069.html>
- Stock, Stephen (13 Sep 2013). "California Fracking Law Has Huge Holes, Critics Argue". NBC Bay Area. National Broadcasting Company. Retrieved 18 September 2014.
- Mark Melincoe, Brown says he'll sign California bill regulating fracking, Bloomberg, 12 Sept, 2013.
- Feldman, Dana. "Beverly Hills Bans Fracking; First City In California To Do So." Huffington Post 7 May 2014. Web. 14 May 2014. <http://www.huffingtonpost.com/2014/05/07/beverly-hills-bans-fracking_n_5277953.html>.
- O'Connor, Lydia. "California City Becomes First to Vote to Ban Fracking." Huffington Post 24 Apr. 2014. Web. 14 May 2014. <http://www.huffingtonpost.com/2014/04/24/beverly-hills-fracking-ban_n_5208377.html>
- Streeja VN, "Three Colorado Cities Vote In Favor Of Anti-Fracking Measures, While Initiative Fails In Broomfield By 194 Votes", International Business Times, 6 Nov. 2013
- Elliott, Dan. "Colorado Oil and Gas Task Force Weighs Disclosure Of Fracking Chemicals". Huffington Post. AP. Retrieved 9 July 2015.
- Minor, Joel (January 2014). "Local Government Fracking Regulation: A Colorado Case Study". Stanford Environmental Law Journal. 33 (1): 61–122.
- Ray, Kelsey. "Post-mortem: Why Colorado's anti-fracking measures didn't make the ballot". The Colorado Independent.
- "Characterizing Emissions from Natural Gas Drilling and Well Completion Operations in Garfield County, CO" (PDF). Colorado State University Department of Atmospheric Science. Retrieved 20 October 2016.
- "Health Impact Assessment for Battlement Mesa, Garfield County Colorado" (PDF). Retrieved 2 October 2016.
- "Health Impact Assessment for Battlement Mesa, Garfield County Colorado" (PDF). Colorado School of Public Health. Retrieved 2 October 2016.
- Adler, Ben. "Living next to natural gas wells is no fun.". Retrieved 22 October 2016.
- Adler, Ben. "Living next to natural gas wells is no fun.". Retrieved 22 October 2016.
- Wheeler, Tim (September 12, 2012). "Greens urge 'fracking' ban in Maryland. Lawmaker vows to bar controversial gas drilling until impact studies done". Baltimore Sun. Retrieved February 4, 2014.
- "New Jersey Fracking Ban: Gov. Chris Christie's 1-Year Recommendation Accepted By Lawmakers". The Huffington Post. 10 January 2012. Retrieved 13 November 2013.
- Jim, Malewitz (24 September 2012). "In New Jersey, Christie Vetoes Anti-Fracking Bill". Stateline. The Daily News Service of The Pew Charitable Trusts. Retrieved 13 November 2013.
- Navarro, Mireya (30 November 2010). "N.Y. Assembly Approves Fracking Moratorium". The New York Times Company.
- Eaton TT. Science-based decision-making on complex issues: Marcellus shale gas hydrofracking and New York City water supply. Sci Total Environ. 2013 Sep 1;461-462:158-69. doi: 10.1016/j.scitotenv.2013.04.093. Epub 2013 May 28. PMID 23722091
- Brady, Jeff (December 18, 2014). "Citing Health, Environment Concerns, New York Moves To Ban Fracking". National Public Radio. Retrieved 6 January 2015.
- Navarro, Mireya (20 September 2012). "New York State Plans Health Review as It Weighs Gas Drilling". The New York Times Company.
- Editorial Board (17 December 2014). "Gov. Cuomo Makes Sense on Fracking". New York Times. Retrieved 18 December 2014.
- Barnes, Shawnee (12 July 2011). "Town of Ithaca bans gas drilling". Ithaca Journal. Retrieved July 14, 2011.
- Munzer, Aaron (30 June 2011). "Ulysses residents at hearing back proposed fracking ban". Ithaca Journal. Retrieved July 14, 2011.[dead link]
- Martin, Alyson (13 July 2011). "Caroline rejects move to stay out of hydrofracking". Ithaca Journal. Retrieved July 14, 2011.
- AP (8 July 2011). "Auburn to ban wastewater from gas drillers". Ithaca Journal. Retrieved July 14, 2011.
-  NYC DEP, 2011
- Gerken, James (March 6, 2012). "Niagara Falls: Drilling Wastewater Won't Be Treated Here". Huffington Post. Associated Press. Retrieved March 8, 2012.
- James Zehringer, Testimony to the Ohio House of Representatives, 16 May 2013.
- "Ohio Senate Bill 315". May 24, 2012. Retrieved June 9, 2012.
- "Ohio passes drilling regulation bill". Upstream Online. NHST Media Group. May 25, 2012. Retrieved May 28, 2012.
- John Funk (May 24, 2012). "Ohio lawmakers race to finish shale gas regulations despite complaints from environmentalists". Cleveland Plain Dealer. Cleveland Plain Dealer. Retrieved June 9, 2012.
- John Funk (May 20, 2012). "Gov. John Kasich's proposed fracking law is riddled with loopholes, say environmental groups". Cleveland Plain Dealer. Cleveland Plain Dealer. Retrieved June 9, 2012.
- Jordan Cohen, Niles council rescinds ban on fracking ordinance, Vindy, 19 Sept. 2013.
- "Pennsylvania Act 13 (HB 1950)"
- "The impact of Act 13 (HB 1950) on Pennsylvania's People and Communities", Marcellus Outreach Butler
- Goldstein, B. D.; Kriesky, J; Pavliakova, B (April 2012). "Missing from the table: role of the environmental public health community in governmental advisory commission related to the Marcellus Shale Drilling". Environmental Health Perspectives. 120 (4): 483–486. doi:10.1289/ehp.1104594. PMC . PMID 22233770.
- Matt Kelso (August 20, 2013). "PA Releases Unconventional Production and Waste Data". StateImpact Pennsylvania. Fractracker.org. Retrieved October 19, 2013.
- Susan Phillips (2 November 2012). "DEP Employee Says Agency Withholds Water Contamination Information from Residents". StateImpact Pennsylvania. NPR. Retrieved November 10, 2012.
- David Caruso (2011-01-03). "44,000 Barrels of Tainted Water Dumped Into Neshaminy Creek. We're the only state allowing tainted water into our rivers". NBC Philadelphia. Associated Press. Retrieved April 28, 2012.
- Howarth, Robert W.; Santoro, Renee; Ingraffea, Anthony (13 March 2011). "Methane and the greenhouse-gas footprint of natural gas from shale formations" (PDF). Climatic Change. Springer. 106 (4): 679–690. doi:10.1007/s10584-011-0061-5. Retrieved May 7, 2012.
- Howarth, Robert W.; Ingraffea, Anthony; Engelder, Terry (15 September 2011). "Should Fracking Stop? Extracting gas from shale increases the availability of this resource, but the health and environmental risks may be too high. Point: Yes, it's too high risk". Nature. 477 (477): 271–275. doi:10.1038/477271a.
- Bill McKibben (March 8, 2012). "Why Not Frack?". The New York Review of Books. 59 (4). Retrieved February 21, 2012.
- Don Hopey (February 24, 2011). "Corbett repeals policy on gas drilling in parks". Pittsburgh Post-Gazette. Retrieved March 7, 2012.
- Pennsylvania House bill 1950
- "Local zoning provisions in Pa.'s gas drilling law". USA Today. Associated Press. March 3, 2012. Retrieved February 23, 2012.[dead link]
- Conrad D. Volz; Kyle Ferrar; Drew Michanowicz; Charles Christen; Shannon Kearney; Matt Kelso; Samantha Malone (March 28–29, 2011). "Contaminant Characterization of Effluent from Pennsylvania Brine Treatment Inc., Josephine Facility:Implications for Disposal of Oil and Gas Flowback Fluids from Brine Treatment Pollutants" (PDF). EPA Hydraulic Fracturing Study Technical Workshop 3, Fate and Transport. Retrieved February 4, 2014.
- Susana G. Baumann (July 20, 2012). "Fracking regulations, a legal battle in Pennsylvania". VOXXI News. Retrieved July 21, 2012.
- Sheppard, Kate (March 23, 2012). "For Pennsylvania's Doctors, a Gag Order on Fracking Chemicals. A new provision could forbid the state's doctors from sharing information with patients exposed to toxic fracking solutions.". Mother Jones. Retrieved March 23, 2012.
- "The EPA Says Pennsylvania Is Screwing Up The Fracking Investigating And It's Taking Over". Associate Press. March 6, 2012. Retrieved May 11, 2013.
- "EPA heightens scrutiny over Pa. gas drilling". Fox News. March 5, 2012. Retrieved May 11, 2013.
- "Pennsylvania DEP Secretary Defends States' Ability to Regulate Hydraulic Fracturing". PR Newswire. November 17, 2011.
- Ian Urbina (February 26, 2011). "Regulation Lax as Gas Wells' Tainted Water Hits Rivers". The New York Times. Retrieved February 22, 2012.
- Olson, Laura (Post-Gazette Harrisburg Bureau) (July 7, 2011). "Dad's donation riles state Democrats: Father of DEP secretary gave $25,000 to GOP on the eve of his confirmation by Pennsylvania Senate". Pittsburgh Post-Gazette. Retrieved March 7, 2012.
- Greg Abbott
- "Vermont Act 152"
- "Vermont becomes first state to ban fracking". Fox News. May 17, 2012. Retrieved August 15, 2012.
- CNN Wire Staff (May 17, 2012). "Vermont first state to ban fracking". CNN. Retrieved June 9, 2012.
- White, Rodney (May 4, 2012). "Vermont legislature votes 103-36 to ban hydraulic fracturing". Washington (Platts). Retrieved May 4, 2012.
- David O. Williams, oil and gas regulators approve new rules for frack fluid disclosure, June 8, 2010, The Colorado Independent.
- Wyoming approves 'fracking' disclosure rules , June 9, 2010, trib.com
- Javers, Eamon (November 8, 2011). "Oil Executive: Military-Style 'Psy Ops' Experience Applied". CNBC.
- Phillips, Susan (November 9, 2011). "'We're Dealing with an Insurgency,' says Energy Company Exec of Fracking Foes". National Public Radio.
- Adam Aigner-Treworgy (February 9, 2012). "Santorum takes on 'environmental terror'". CNN. Retrieved February 24, 2012.
- "Chemicals that may be used in Australian CSG fraccing fluid" Australian Petroleum Ptoduction & Exploration Association Limited
- "Will The EPA Crack Down On 'Fracking'?", Investopedia
- Wilber, Tom (2012). Under the Surface: Fracking, Fortunes, and the Fate of the Marcellus Shale. Ithaca, NY: Cornell University Press. ISBN 9780801450167.
- Introduction to hydraulic fracturing – United States Geological Survey
- Hydraulic fracturing – Bureau of Land Management
- Hydraulic fracturing in California – California Department of Conservation
- Questions and Answers About Hydraulic Fracturing in Michigan – Michigan Department of Environmental Quality
- Natural Gas Drilling in Marcellus Shale – City of New York