U. S. STEEL’S CLAIRTON PLANT
At U. S. Steel, environmental stewardship is a top priority.
U. S. Steel has invested hundreds of millions of dollars in environmental improvements, including over $50 million in Clairton improvements as part of the plan we submitted to the Allegheny County Health Department (ACHD) in August 2018 and to which the ACHD approved. Those improvements, as well as the hiring of over fifty new employees to work at Clairton Plant on coke oven battery operations and maintenance, have helped make 2018 the best year ever recorded for PM2.5 at the Liberty Monitor in Allegheny County.
In 2018, we also completed an over $40M investment on time, as committed to the ACHD, to improve SO2 ambient air levels. In addition, we recently announced an over $1B investment that includes new technology and a cogeneration facility at Mon Valley Works, which will secure steel making and good paying union jobs for decades to come in the Mon Valley. The planned cogeneration facility at Clairton Plant is a part of that $1B investment and will turn coke oven gas into electricity and include state-of-the art emissions controls which, with the other investments at Edgar Thomson Plant announced this May, will make further improvements in SO2, PM 2.5 and greenhouse gas emissions.
Additionally, U. S. Steel is absolutely committed to making even more substantial investments in Clairton to make further environmental improvements and we have been working with the ACHD for input and assistance before implementation.
As the Allegheny County Health Department has confirmed, at no time during the brief disruption to our facility following the small electrical fire on June 17, was there any public health risk. Protecting our shared environment remains a top priority for U. S. Steel and we are thankful to crew members who worked tirelessly to restore operations as quickly and safely as possible.
On June 28, the company announced that it reached an agreement with the Allegheny County Health Department to resolve the company’s appeal of enforcement orders associated with battery compliance at the Clairton Plant. The full announcement is available here and the full agreement can be read here.
Our Operations

Mon Valley Works Facts
U. S. Steel’s Mon Valley Works includes four facilities, three of which are in the Pittsburgh area. Learn more about these facilities, as well as U. S. Steel’s other operations and locations in Southwestern Pennsylvania.

Coke Making Process
Coke is a critical raw material in the blast furnace method of steel production used by U. S. Steel. Learn more about the process used to transform coal into coke.
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