Louisville sewer explosions

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The Louisville sewer explosions were a series of explosions on February 13, 1981, that destroyed more than 13 miles (21 km) of sewer lines and streets in the center of Louisville, Kentucky.[1][2][3] The explosions resulted in extensive damage to property and infrastructure and four people were injured, but none of the injuries were serious and there were no fatalities.[4][5]

The blasts were caused by the ignition of hexane vapors which had been illegally discharged from a Ralston-Purina soybean processing plant located near the University of Louisville. The plant, located on Floyd Street, was a long-standing landmark built early in the century and recognizable by its 22 large silos topped with a Ralston-Purina sign and checkerboard logo. It was visible from two major arteries – Eastern Parkway and Interstate 65 – until the facility was sold in the wake of the incident and the site was eventually purchased by the university and demolished in 2014.[6][7] The site had been a processing facility for cotton seed or soybeans since at least 1900.[6]

Repairs to the sewers and streets took about two years.[8] Ralston-Purina paid $18 million to the Louisville Metropolitan Sewer District, about $9 million to about 17,000 plaintiffs in a lawsuit settled in 1984, $4 million to the city, and $2 million to affected members of the public that did not sue the company.[9] The company admitted that it had released hexane into the sewers, but initially did not accept responsibility for the blasts[1] and continued to deny negligence for years[10] until eventually pleading guilty to four counts of violating federal environmental laws and paying the maximum possible fine, $62,500.[5][11][12][13]

The event[edit]

The Ralston-Purina plant used hexane as a solvent to extract oil from soybeans. The plant employed a containment system designed to recycle used hexane from the process back to the plant. However, the containment system was not functioning that night, and a large quantity of hexane was released into the sewers. The U.S. Government Accountability Office and American Society of Civil Engineers estimated the amount of hexane spilled as being thousands of gallons (roughly 10,000 liters or more), although the company disputed the amount.[8][14] The hexane then began to vaporize in the sewers and seep out of manholes in the streets.[15] At about 1:30 a.m. on the day of the explosions, the company called an inspector and informed him that there had been some leakage from the facility. The inspector visited the site and checked for vapors on some nearby streets but did not notice a serious problem.[4] The circumstances surrounding the visit by the inspector and the amount and type of information given to him were later disputed.

At approximately 5:16 a.m. on Friday, February 13, 1981, a cascading series of explosions ripped through the southern part of Old Louisville near the University of Louisville. The trigger of the explosions was eventually determined to have been a spark from a car driving near the intersection of 12th and Hill Streets, which ignited the hexane fumes in the street and the sewers.[11] The car contained two women who were on their way to work at the local hospital, and the force of the blast reduced the street to rubble and threw the car onto its side. Officers in a police helicopter that happened to be over the area at the time said the series of explosions looked like a bombing run.[9]

More than 13 miles (21 km) of sewer lines, including the entire two miles (3 km) of the main trunk line with a diameter of 7.5–12 feet (2.3–3.7 m), were destroyed in the blast.[2][8][15] Manhole covers shot up into the sky and came crashing down with great destructive force.[15][16][17] One manhole cover crashed completely through the ceiling and floor of a third-floor apartment on Second street, and another narrowly missed a child when it landed in a house at the corner of 9th and Hill streets.[16] The streets under which the sewer lines ran were destroyed – completely fragmenting some streets and leaving large holes in others as much as 38 feet (12 m) deep, exposing raw sewage pits where the sewers had been.[2][3] In some places, sections of pavement were left standing on end near the gaping holes. Water lines and gas lines were severed, leaving area residents without service for weeks.[15] The chimneys of 43 buildings fell and some stairways collapsed.[2]

As the day progressed after the major series of explosions, the fumes continued to build up in some areas. "It's still potentially explosive," said Louisville mayor William Stansbury as a 20-block area was being evacuated.[4] A buildup of fumes occurred where the sewers ran under an Ashland Oil refinery, raising the potential for a further major conflagration, but workers were able to flush out the system in the area.[4] At 3:45 p.m., the last explosion occurred, blowing out a manhole cover at the intersection of Second street and Burnett Avenue.[2]

The university and all businesses and other schools in the area were shut down for varying periods (including the shops and restaurants that area residents needed to use, especially as they had no running water and could not access the area by car due to the damage to the streets). The fact that the incident took place in the heart of winter compounded the hardship, and some residents were left without heat until gas lines and furnaces could be tested and repaired. The Kentucky National Guard was called up to control the damaged area, which was declared a disaster area by U.S. President Ronald Reagan.[5][17] About 2,000 people had to be evacuated, and water and sewage service was disrupted for about 23,000 people.[17] Rain showers followed in the days after the incident, and heavy rains followed later, causing further damage by flooding and eroding the open pits of sewage.[1][16][17] Once water service was restored, residents were told to conserve water, boil the water if they needed to drink it, and avoid flushing toilets as much as possible. The open trench along Hill street remained exposed through the summer, emitting a foul stench for about six months before the system could be enclosed again.[2]

The women in the car that sparked the explosion were injured, but not seriously. Luckily, the streets were nearly deserted since it was early in the morning, so no fatalities resulted from the blasts.[14]

Aftermath and legacy[edit]

After the incident, Ralston-Purina used more than $2 million of city industrial bonds to fund a rebuilding of its facility in 1983, and then sold it in 1984.[11]

In 1985, the city of Louisville and Jefferson County, Kentucky, passed a hazardous materials ordinance in response to the disaster. This ordinance gave the Louisville Metropolitan Sewer District the authority to regulate the handling of hazardous materials.[9]

The incident has been cited by such entities as the American Society of Civil Engineers[14] and the U.S. Government Accountability Office as an example of the need for increased security concerning the United States' wastewater systems,[8] and by the United States Environmental Protection Agency as an example of the dangers associated with discharges of hazardous waste to sewer systems.[18] Articles discussing the event have been published in Environmental Geology[19] and Journal of the American Oil Chemists' Society.[20]

See also[edit]


  1. ^ a b c Williams, Winston (February 18, 1981). "Louisville's cleanup begins in Wake of Sewer Explosion". The New York Times. Retrieved February 23, 2018.
  2. ^ a b c d e f Dayton, Scottie (March 2008). "The Big Bang". Municipal Sewer and Water Magazine. Retrieved February 24, 2018.
  3. ^ a b McKenzie, Elijah (September 23, 2017). "The restoration of Garvin Gate in Old Louisville". Insider Louisville. Retrieved February 25, 2018.
  4. ^ a b c d "Area of Louisville Damaged by Blasts". The New York Times. Associated Press. February 14, 1981. Retrieved February 23, 2018.
  5. ^ a b c Sheeran, Thomas J. (December 31, 1981). "Ralston Purina, indicted in sewer blasts, apologizes". Retrieved February 24, 2018.
  6. ^ a b Smith, Lawrence (December 18, 2013). "U of L purchases iconic silos; plans to tear them down". WDRB. Retrieved February 23, 2018.
  7. ^ Shafer, Sheldon S. (July 31, 2014). "U of L silo demolition begins". The Courier-Journal. Retrieved February 25, 2018.
  8. ^ a b c d United States Government Accountability Office (January 2005). "GAO-05-165, Wastewater Facilities: Experts' Views on How Federal Funds Should Be Spent to Improve Security". Retrieved October 18, 2007.
  9. ^ a b c Bruggers, James (July 13, 2003). "Blasts Ripped Louisville streets, Spurred Hazardous Material Law". The Courier-Journal.[dead link]
  10. ^ "Company Pays Millions In 1981 Sewer Explosion". The New York Times. Associated Press. December 9, 1984.
  11. ^ a b c "A Time of Crises – MSD History". Metropolitan Sewer District of Louisville official website. Archived from the original on September 27, 2007. Retrieved February 24, 2018.
  12. ^ "Ralston Purina Indicted In Louisville Sewer Blast". The New York Times. Associated Press. December 31, 1981. Retrieved February 23, 2018.
  13. ^ Bernstein, Adam (March 20, 2012). "Obituaries – Raymond W. Mushal, Justice Department lawyer". The Washington Post. Retrieved February 25, 2018.
  14. ^ a b c American Society of Civil Engineers (2006). "Guidelines for the Physical Security of Water Utilities". American Society of Civil Engineers: 1–6. Archived from the original on July 14, 2007. Retrieved October 18, 2007.
  15. ^ a b c d Vesilind, P. Aarne; Thomas D. DiStefano (2005). Controlling Environmental Pollution: An Introduction to the Technologies, History, and Ethics. DEStech Publications, Inc. p. 168. ISBN 1-932078-39-8.
  16. ^ a b c "The day Louisville's sewers exploded in 1981". The Courier-Journal. February 22, 2018. Retrieved February 22, 2018.
  17. ^ a b c d Claxton, Matthew (February 18, 2014). "The day Purina blew up Louisville". The Vancouver Courier. Retrieved February 23, 2018.
  18. ^ United States Environmental Protection Agency (February 1999). "Introduction to the National Pretreatment Program". Diane Publishing Company: 3. ISBN 978-1-4289-0271-8. Retrieved October 18, 2007.
  19. ^ Bennett, Gary F. (May 1989). "Impact of toxic chemicals on local wastewater treatment plant and the environment". Environmental Geology. Springer Berlin / Heidelberg. 13 (3): 201–212. Bibcode:1989EnGeo..13..201B. doi:10.1007/BF01665370. Retrieved October 18, 2007.
  20. ^ Kingsbaker, C. L. (February 1983). "Recent safety experiences". Journal of the American Oil Chemists' Society. Springer Berlin / Heidelberg. 60 (2): 245–257. doi:10.1007/BF02543492. Retrieved October 18, 2007.

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