Investigations

Location: Baileyville, ME
Incident Occurred On: 01/27/2026

On February 9, 2026, the CSB opened an investigation into the fatal release of a toxic gas, hydrogen sulfide, that occurred on January 27, 2026, at the Woodland Pulp Mill manufacturing facilit...
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Location: McEwen, TN
Incident Occurred On: 10/10/2025

On October 27, 2025, the CSB opened an investigation into the fatal explosion that occurred on October 10, 2025, at the Accurate Energetic Systems, LLC (AES) explosive manufacturing facility i...
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Location: Clairton, PA
Incident Occurred On: 08/11/2025

On August 11, 2025, at approximately 10:45 a.m. local time, an explosion at the Unites States Steel Corporation Clairton Plant coke oven batteries 13 and 14 caused two fatalities and mult...
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Location: Fremont, NE
Incident Occurred On: 07/29/2025

On July 29, 2025 at approximately 11:56 am local time, multiple explosions occurred at the Horizon Biofuels facility in Fremont, Nebraska, resulting in three fatalities.

Incident Occurred On: 06/11/2025

On June 11, 2025, at approximately 8:15 a.m., local time, the Austin Powder facility in McArthur, Ohio, experienced an accidental release of nitrogen oxides and nitric acid from an acid s...
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Location: Monaca , PA
Incident Occurred On: 06/04/2025

On June 4, 2025, at approximately 2:19 p.m. local time, the Shell Polymers Monaca facility experienced an accidental release of butadiene and benzene from the ethane cracking unit. The inciden...
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Location: Louisville , KY
Incident Occurred On: 11/12/2024

A massive explosion on November 12, 2024, at the Givaudan Sense Colour facility in Louisville, KY, fatally injured t...
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Location: Plaquemine, LA
Final Report Released On: 02/26/2026

On July 14, 2023, at approximately 9:15 p.m., multiple explosions occurred in the Dow Louisiana Operations Glycol II Ethylene Oxide Finishing unit in Plaquemine, Louisiana.

This inci...
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Location: Deer Park, TX
Final Report Released On: 02/23/2026

October 10, 2024, at approximately 4:30 p.m., a hydrogen sulfide release occurred at the PEMEX Deer Park facility’s amine recovery unit while workers were attempting to remove an isolati...
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Location: Sterling, VA
Final Report Released On: 09/25/2025

A July 31, 2024, ammonia release at Cuisine Solutions, Inc., a food processing facility in Loudon County, VA led to forty people being evaluated at local hospitals. O...
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Final Report Released On: 06/03/2025

On May 30, 2024 a worker at a liquid nitriding facility in Chattanooga was fatally injured  following a chemical release/eruption of chemicals from a process ...
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Location: Geismar, LA
Final Report Released On: 05/27/2025

A heat exchanger rupture resulted in the release of hydrogen fluoride (HF) gas, chlorine gas, and various other process fluids. No injurie...
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Location: Martinez, CA
Final Report Released On: 03/13/2025

The incident involved a fire event at the Hydrodeoxygenation Unit recycle furnace. One operator sustained serious burn injures as a result of the fire.

Study Released On: 07/25/2024

Over the last several years, the U.S. Chemical Safety and Hazard Investigation Board (CSB) has reviewed and investigated numerous incidents where the consequences escalated following a lo...
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