Methyl tert-butyl ether (MTBE) is a gasoline additive used as an oxygenate and to raise the octane number. Its use has declined in the United States in response to environmental and health concerns. It has polluted groundwater due to MTBE-containing gasoline being spilled or leaked at gas stations. MTBE spreads more easily underground than other gasoline components due to its higher solubility in water. Cost estimates for removing MTBE from groundwater and contaminated soil range from $1 to $30 billion, including removing the compound from aquifers and municipal water supplies, and replacing leaky underground oil tanks. Who will pay for remediation is controversial. In one case, the cost to oil companies to clean up the MTBE in wells belonging to Santa Monica is estimated to exceed $200 million.
Recent state laws have been passed to ban MTBE in certain areas. California and New York, which together accounted for 40% of U.S. MTBE consumption, banned the chemical starting January 1, 2004, and as of September 2005, twenty-five states had signed legislation banning MTBE. A table of state by state information, as of 2002, is available at the United States Department of Energy website.
In 2000, the EPA drafted plans to phase out the use of MTBE nationwide over four years. As of fall 2006, hundreds of lawsuits are still pending regarding MTBE contamination of public and private drinking water supplies.
The Energy Policy Act of 2005, passed in the House on April 21, 2005, did not include a provision for shielding MTBE manufacturers from water contamination lawsuits. This provision was first proposed in 2003 and had been thought by some to be a priority of Tom DeLay and Rep. Joe Barton, chairman of the Energy and Commerce Committee. This bill did include a provision that gives MTBE makers, including some major oil companies, $2 billion in transition assistance as MTBE is phased out over the next nine years. Due to opposition in the Senate, the conference report dropped all MTBE provisions. The final bill was passed by both houses and signed into law by President Bush. The lack of MTBE liability protection is resulting in a switchover to the use of ethanol as a gasoline additive. Some traders and consumer advocates are blaming this for an increase in gasoline prices.
Notable incidents in the US
In 2005, an Exxon-Mobil station in Fallston, Maryland, was found to be leaking MTBE into the local wells. The discovery resulted in the station being abruptly closed. Exxon-Mobil referred to the closure as a "business decision". Following the closure, MTBE levels in the area dropped.
In 2006, the wells of a neighborhood in Jacksonville, Maryland, were contaminated by a spill of 26,000 gallons from an Exxon-Mobil station in the area, resulting in an ongoing court battle. The suit has been filed by the state of Maryland's department of the environment on behalf of the area's residents, seeking millions of dollars in damages from Exxon-Mobil. Many residents also filed their own separate lawsuits.
The case began in 2006, when a gasoline tank sprang a leak that was not detected for 34 days. Testing of 120 wells resulted in dangerously high levels of MTBE being found. Residents were put in danger by the spill, and in order to prevent further health problems, they required bottled water for cooking, drinking, and brushing teeth. Residents of Jacksonville continue to use bottled water for all activities despite having MTBE filters and alarms installed in their homes. Home values also dropped as a result of the spill.
In September 2008, Exxon-Mobil settled the case with the state by agreeing to pay a $4 million fine, and face an additional $1 million in penalties annually if they did not work to clean up the spill.
In March 2009, a jury awarded $150 million in damages to some of the area's residents. The jury did not assess any punitive damages in the case, finding that Exxon Mobil did not act fraudulently. A separate case including over 150 property owners as plaintiffs began in early 2011. Punitive damages were awarded to the second group of plaintiffs, who were able to prove that Exxon DID act fraudulently.
Santa Monica, California
In 1995 high levels of MTBE were unexpectedly discovered in the water wells of Santa Monica, California, and the U.S. Geological Survey reported detections. Subsequent U.S. findings indicate tens of thousands of contaminated sites in water wells distributed across the country. As per toxicity alone, MTBE is not classified as a hazard for the environment, but it imparts an unpleasant taste to water already at very low concentrations. The maximum contaminant level of MTBE in drinking water has not yet been established by the United States Environmental Protection Agency (EPA). The leakage problem is partially attributed to the lack of effective regulations for underground storage tanks, but spillage from overfilling is also a contributor. As an ingredient in unleaded gasoline, MTBE is the most water soluble component. When dissolved in groundwater, MTBE will lead the contaminant plume with the remaining components such as benzene and toluene following. Thus the discovery of MTBE in public groundwater wells indicates that the contaminant source was a gasoline release. Its criticism and subsequent decreased usage, some claim, is more a product of its easy detectability (taste) in extremely low concentrations (ppb) than its toxicity. The MTBE concentrations used in the EU (usually 1.0–1.6%) and allowed (maximum 5%) in Europe are lower than in California.
- Hartman, Blayne. "Which Compound Requires More Attorneys: MTBE or Benzene?". H&P Mobile GeoChemistry. Archived from the original on 2009-03-01.
- "SIGMA Weekly Report". SIGMA. 2005-05-23. Archived from the original on 2009-10-09.
- "Long Island Utility Fighting to Defeat MTBE Safe Harbor". Napoli, Kaiser, Bern & Associates. 2004-03-16. Archived from the original on 2007-10-20.
- "Oil Companies Pay Santa Monica MTBE Cleanup Costs". AmeriScan. Environment News Service. 2005-02-17. Retrieved 2013-10-24.
- "Status and Imact of State MTBE Bans". Energy Information Administration. 2003-03-27. Retrieved 2013-10-24.
- "House approves energy bill". CNN. 2005-04-21. Archived from the original on 2005-04-22.
- "House approves $12 billion energy package". MSNBC.com. 2005-04-21. Archived from the original on 2010-09-07.
- Babington, Charles (June 16, 2004). "House Again Passes GOP Energy Measures". Washington Post. p. A4.
House passes Energy Bill, but Senate opponents of MTBE provision in House Bill have the votes to prevent its enactment
- "Bill Summary & Status - 109th Congress (2005 - 2006) - H.R.6". THOMAS. Library of Congress. 2005-04-18. Retrieved 2013-10-24.
- "Gas Prices Ethanol". CNN Money. 2006-04-18.[dead link]
- "CCL 2 List and Regulatory Determinations: Chemical Contaminant Candidates". United States Environmental Protection Agency.
- Shelsby, Ted (2004-10-06). "Traces of MTBE found at more Harford sites". The Baltimore Sun. Archived from the original on 2004-11-16.
- Wheeler, Timothy B. (2004-07-21). "State considers new MTBE rules". The Baltimore Sun. Archived from the original on 2004-11-20.
- Pelton, Tom (2004-08-12). "Regulations aim to protect Md. wells from fuel additive". The Baltimore Sun. Archived from the original on 2004-11-10.
- Mitchell, Josh (2005-04-28). "Gas station in Fallston tied to leaks of MTBE and fouled wells is closed". Hartford Courant. Retrieved 2013-10-24.
- "MTBE level drops near gas station in Fallston". Daily Press. 2004-07-16. Retrieved 2013-10-24.
- Shelsby, Ted (2004-09-08). "Harford approves gas station moratorium". Baltimore Sun. Retrieved February 22, 2012.
- Wheeler, Timothy B. (2006-05-11). "Exxon to face more lawsuits over gas leak". Baltimore Sun.
- Hirsch, Arthur (2013-06-26). "High court won't reconsider most of ExxonMobil ruling". Baltimore Sun.
- "State Sues Exxon Over Gas Spill". WBAL-TV. 2006-04-27. Retrieved 2013-10-24.
- [dead link]
- Wheeler, Timothy B. (2006-03-16). "Residential well's MTBE levels exceed guidelines". Baltimore Sun.
- van den Beemt, Pat (2008-12-10). "Plaintiffs describe shattered dreams in Exxon trial". Explorebaltimorecounty.com. Retrieved 2013-10-24.
- Malik, Shezad (2009-03-13). "Exxon Found Liable in Maryland Gas Leak". Dallas Fort Worth Injury Lawyer Blog. Retrieved 2013-10-24.
- Madigan, Nick (2008-09-17). "Exxon fined $4 million for gas leak". baltimoresun.com. Retrieved 2013-10-24.
- Hare, Mary Gail (2009-03-13). "Exxon liable for gas leak damage". Baltimore Sun. Retrieved 2014-01-02.
- Hirsch, Arthur (2011-06-17). "Jacksonville gas spill: Exxon Mobil accused of 'fraud' in Jacksonville gas spill trial closing arguments". baltimoresun.com. Retrieved 2013-10-24.
- "Occurrence of the gasoline additive MTBE in shallow ground water in urban and agricultural areas". Pubs.er.usgs.gov. 1995-07-01. Retrieved 2013-10-24.
- Arthur D. Little (March 2001). "MTBE and the Requirements for Underground Storage Tank Construction and Operation in Member States". European Commission.
- Wilson, Janet (2008-05-08). "$423-million MTBE settlement is offered". Los Angeles Times. Retrieved February 16, 2012.