2025-20414: Clean Air Act Operating Permit Program; Order on Petitions for Objection to State Operating Permit for U.S. Steel Mon Valley Works, Irvin Plant
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The Environmental Protection Agency (EPA) Administrator signed an order dated September 16, 2025, granting in part and denying in part two petitions: one dated November 15, 2024 from United States Steel Corporation; and one dated November 15, 2024, from the Environmental Integrity Project, PennFuture, and Clean Air Council. The petitions requested that the EPA object to a Clean Air Act (CAA) title V operating permit issued by the Allegheny County Health Department to U.S. Steel Mon Valley Works Irvin Plant for its secondary steel processing facility located in West Mifflin, Allegheny County, Pennsylvania.
The agency’s own summary, as published.
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