PFAs and PFOAs

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

In June 2022, the U.S. EPA announces new PFAS health advisories

The U.S. Environmental Protection Agency (EPA) released new and revised drinking water lifetime health advisories (HAs) for four per- and polyfluoroalkyl substances (PFAS). Lifetime HAs are intended, with a margin of safety, to represent levels at which adverse health effects are not expected to occur over a lifetime of exposure. The values are: 

Final Lifetime Health Advisories 
Hexafluoropropylene oxide dimer acid (GenX) - 10 ng/L 
Perfluorobutanesulfonic acid (PFBS) - 2,000 ng/L

Interim Lifetime Health Advisories 
Perfluorooctanesulfonic acid (PFOA) - 0.004 ng/L 
Perfluorooctanesulfonic acid (PFOS) - 0.020 ng/L

The interim lifetime PFOA and PFOS HAs replace the previous 70 ng/L combined advisory value released in 2016. Approved analytical methods for PFOA and PFOS have minimum reporting levels (MRLs) of 4 ng/L. EPA recommendations accompanying the interim advisories recommended further investigation, public communication and evaluation of exposure reduction when PFOA and PFOS levels exceed the MRLs.

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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.

Links:

EPA: Basic Information on PFAS

DEP: PFAS in Pennsylvania