OSHA Cites US Steel for Fatal Coke Works Explosion

Regulators propose penalties for steel giant and contractor after deadly 2025 incident.

Published on Feb. 25, 2026

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The U.S. Department of Labor has cited United States Steel Corp. and contractor MPW Industrial Services following an August 2025 explosion at the Clairton Coke Works in Pennsylvania that killed two workers and injured 12 others. OSHA found that both companies failed to follow required safety protocols during hazardous work involving flammable gas and high-pressure equipment, exposing employees to explosion, struck-by, and injection risks.

Why it matters

This incident highlights ongoing safety concerns in the steel industry, where workers face inherent risks from high-pressure equipment, flammable materials, and other hazards. The citations and proposed penalties underscore the importance of rigorous safety procedures and oversight to protect workers, especially during maintenance and repair operations.

The details

According to OSHA, U.S. Steel failed to follow required safety protocols during hazardous work involving flammable gas at the Clairton Coke Works facility. Meanwhile, cleaning services contractor MPW was cited for failing to provide a relief valve for a high-pressure water system, among other violations. In total, OSHA cited U.S. Steel for 8 violations and proposed $118,214 in penalties, while MPW was cited for 6 violations with proposed penalties of $61,473.

  • The explosion occurred in August 2025 at the Clairton Coke Works facility in Pennsylvania.

The players

United States Steel Corp.

A major American steel producer that operates the Clairton Coke Works facility where the fatal explosion took place.

MPW Industrial Services

A contractor that provided cleaning services at the Clairton Coke Works facility and was also cited by OSHA for safety violations.

Occupational Safety and Health Administration (OSHA)

The federal agency that investigated the explosion and cited both U.S. Steel and MPW Industrial Services for safety violations.

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The takeaway

This tragic incident underscores the critical importance of rigorous safety protocols and oversight in the steel industry, where workers face inherent risks from high-pressure equipment, flammable materials, and other hazards. The OSHA citations and proposed penalties serve as a stark reminder that companies must prioritize worker safety above all else.