PFAs and PFOAs

Concerns of citizens and state and national regulators have placed PFAs and PFOAs in the national news. 

During a fire in McKeesport on July 16, 2021, legacy class-B foam was introduced into the drinking water system in the Lower 10th Ward. While several rounds of testing and flushing resolved the issue to the satisfaction of the Department of Environmental Protection, the test results are posted here:


According to the EPA, per- and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that includes PFOA, PFOS, GenX, and many other chemicals. PFAS have been manufactured and used in a variety of industries around the globe, including in the United States since the 1940s. PFOA and PFOS have been the most extensively produced and studied of these chemicals.

Areas with Defense Department bases, where the substances were used in firefighting foam, and waterproofing and tanneries were sometimes users of the chemicals.


EPA: Basic Information on PFAS

DEP: PFAS in Pennsylvania