PEMEX Deer Park Chemical Release Location: Deer Park, TX Final Report Released On: 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. full Investigation details About the CSB The U.S. Chemical Safety Board (CSB) is an independent, nonregulatory federal agency that investigates the root causes of major chemical incidents. Our public safety mission is to drive chemical safety excellence through independent investigations to protect communities, workers, and the environment. A CSB safety video on its investigation into the fatal combustible dust explosions and fires at the Didion Milling facility in Cambria, Wisconsin, that occurred on May 31, 2017. U.S. Chemical Safety Board Releases New Video, “Safety Pays Off: The Value of Vigilance” Washington D.C., June 23, 2025 - Today, the U.S. Chemical Safety and Hazard Investigation Board (CSB) released a new video outlining the importance of safety at chemical facilities and the significant role that the CSB plays in protecting the American people and improving safety in the chemical. The CSB issues safety recommendations to prevent the recurrence or reduce the likelihood or consequences of similar incidents or hazards in the future. Recommendations are issued to a variety of parties, including government entities, safety organizations, trade unions, trade associations, corporations, emergency response organizations, educational institutions, and public interest groups. CSB staff evaluate recipient responses, and the Board votes to assign status designations to recommendations based on staff evaluation. Recommendations are considered open while in progress and closed when evidence of appropriate action has been provided. December 23, 2025, Washington, D.C. — The U.S. Chemical Safety and Hazard Investigation Board (CSB) today issued two interim safety recommendations in connection with the agency’s ongoing investigation into the August 11, 2025, fatal explosion at U.S. Steel’s Clairton Coke Works facility in Clairton, Pennsylvania. The explosion occurred when coke oven gas was released from process piping. The CSB is currently updating its Drivers of Critical Safety Change pages - the FY26 CDL items (with subtopic areas) are as follows: U.S. Chemical Safety Board Releases Final Report on Fatal 2024 Explosion at Givaudan Facility in Louisville, Kentucky Final Report Released Read More 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.