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EPA Proposes Maximum Contaminant Levels for PFAS

technical bulletin explaining requirements

EPA has announced a proposed National Primary Drinking Water Regulation (NPDWR) for six per- and polyfluoroalkyl substances (PFAS). EPA anticipates finalizing the NPDWR by the end of 2023 and enforcing the regulation by 2026. Compliance is required within 3 years of when

 the regulation is finalized.

EPA is proposing to establish legally-enforceable Maximum Contaminant Levels (MCLs) for six PFAS in drinking water:

  • PFOA and PFOS as individual contaminants at 4 ng/L each, and
  • PFHxS, PFNA, PFBS, and HFPO-DA (GenX) as a PFAS mixture (see Hazard Index, below).

EPA is also proposing health-based, non-enforceable Maximum Contaminant Level Goals (MCLGs) for these six PFAS.

Utilities are not required to take any actions until the PFAS NPDWR is finalized.