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.