PITTSBURGH – The U.S. Department of Labor has cited two Pennsylvania employers after a federal investigation into an August 2025 explosion at a United States Steel Corp. worksite that injured 12 and claimed the lives of two employees.
The department’s Occupational Safety and Health Administration concluded United States Steel Corp. and MPW Industrial Services Inc. exposed workers at the Clairton Steel Works plant to unsafe working conditions including explosion, struck-by, and high-pressure injection hazards.
Federal safety inspectors determined that United States Steel Corp. failed to use required safety management and energy control practices for hazardous work involving flammable gas. OSHA also concluded that cleaning services contractor MPW Industrial Services failed to provide a relief valve for a high-pressure water system and did not coordinate energy control practices for hazardous work involving flammable gas at the steel works.
OSHA cited United States Steel Corp. with seven serious and one other-than-serious violations and proposed $118,214 in penalties. The agency cited MPW Industrial Services Inc. with four serious and two other-than-serious violations and proposed $61,473 in penalties.
Both employers have 15 business days from receipt of their citations and penalties to comply, request an informal conference with OSHA, or contest the findings before the independent Occupational Safety and Health Review Commission. Penalties and citations may be adjusted throughout the course of the case. Please check the OSHA establishment search page periodically for any changes in the inspection or penalty status.
Learn more about OSHA, including controlling hazardous energy, the agency’s general duty clause, permit-required confined spaces, and process safety management.
Employers may contact the agency for information about OSHA’s compliance assistance resources and for free help on complying with OSHA standards.
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