U.S. Steel will pay $135,000 and make several changes to stop the release of oil from its Irvin Works plant into the Monongahela River, the Pennsylvania Department of Environmental Protection announced.

State inspections from August 2022 and April 2025 found “repeated unauthorized discharges of wastewater contaminated with oil” from the West Mifflin facility with visible sheens that in some cases stretched more than a mile downstream, the department said in a statement Tuesday.

The company was first ordered to contain the issue and investigate its cause in October 2023, but subsequent inspections in 2024 and 2025 documented continued violations of Pennsylvania’s Clean Streams Law, according to the state.

U.S. Steel must now monitor its wastewater with live-feed cameras and weekly boat i

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