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ARTICLE · 23 MAY 2025

EPA Provides Update On PFAS Drinking Water Standards

K&L Gates
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On 14 May 2025, Environmental Protection Agency (EPA) Administrator Lee Zeldin announced the agency's plan to address the National Primary Drinking Water Regulations (NPDWR) for per- and polyfluoroalkyl substances (PFAS) finalized last spring, as discussed in our prior alert (22 April 2024).

United StatesEnvironment
Brian Montag
Brian Montag
Dawn M. Lamparello
Dawn M. Lamparello
Cliff L. Rothenstein
Cliff L. Rothenstein
B. David Naidu
B. David Naidu
David L Rieser
David L Rieser
Julia A. McGowan
Julia A. McGowan

On 14 May 2025, Environmental Protection Agency (EPA) Administrator Lee Zeldin announced the agency's plan to address the National Primary Drinking Water Regulations (NPDWR) for per- and polyfluoroalkyl substances (PFAS) finalized last spring, as discussed in our prior alert (22 April 2024). Administrator Zeldin announced that the agency would continue to defend the "maximum contaminant levels" (MCLs) for perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) of 4 ppt, but would propose regulations intended to withdraw MCLs for four additional PFAS that were included in the NPDWR: perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), hexafluoropropylene oxide dimer acid (HFPO-DA, commonly known as GenX), and perfluorobutane sulfonic acid (PFBS). EPA is expected to reconsider the regulatory determinations for these four PFAS, which are found in various products, including water or stain protectants and surface coatings for fabrics,

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