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ARTICLE · 24 APRIL 2024

EPA Finalizes PFAS Safe Drinking Water Regulations

McGlinchey Stafford
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On April 10, 2024, the U.S. Environmental Protection Agency (EPA) announced the final National Primary Drinking Water Regulation (NPDWR) under the Safe Drinking Water Act.

United StatesEnvironment
Michael Blumenthal
Michael Blumenthal

On April 10, 2024, the U.S. Environmental Protection Agency (EPA) announced the final National Primary Drinking Water Regulation (NPDWR) under the Safe Drinking Water Act. The NPDWR established legally enforceable levels, called Maximum Contaminant Levels (MCLs), for six per- and polyfluoroalkyl substances (PFAS) in drinking water.

Specific PFAS Regulations and Levels

Five of the PFAS, specifically perfluorooctanoic acid (PFOA), perfluorooctane sulfonic acid (PFOS), perfluorohexane sulfonate (PFHxS), perfluorononanoic acid (PFNA), and hexafluoropropylene oxide dimer acid (HFPO-DA) are contaminants with individual MCLs. PFAS mixtures containing at least two or more of PFHxS, PFNA, HFPO-DA, and perfluorobutane sulfonate (PFBS) use a Hazard Index MCL to account for the combined and co-occurring levels of these PFAS in drinking water.

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