EPA proposes rescinding NPDWR provisions for PFHxS, PFNA, HFPO‑DA (GenX) and Hazard Index mixture (incl. PFBS)

EPA issued a proposed rule to rescind SDWA regulatory determinations and remove associated PFAS NPDWR provisions for PFHxS, PFNA, HFPO‑DA (GenX chemicals), and the Hazard Index mixture (PFHxS+PFNA+HFPO‑DA+PFBS). If finalized, this would remove related drinking-water requirements (e.g., monitoring/compliance obligations) for those constituents under the 2024 PFAS NPDWR while leaving PFOA/PFOS elements unaffected per the proposal description. Compliance teams at public water systems and supporting laboratories should track the proposal and participate in the comment/hearing process because finalization could materially change which PFAS parameters are regulated under the federal NPDWR.