EPA proposes rescinding SDWA/NPDWR determinations and related drinking-water standards for PFHxS, PFNA, HFPO‑DA (GenX) and Hazard Index mixture (incl. PFBS)

EPA posted a proposed rule to rescind SDWA regulatory determinations and associated provisions of the 2024 PFAS National Primary Drinking Water Regulation (NPDWR) that apply to PFHxS, PFNA, HFPO‑DA (GenX), and the Hazard Index mixture (PFHxS, PFNA, HFPO‑DA plus PFBS). If finalized, this would remove the MCLs/MCLGs and related monitoring/treatment obligations that are specific to these PFAS/mixture, while leaving PFOA and PFOS provisions intact. Compliance teams supporting water utilities, product stewardship, and risk communication should monitor the docket and comment/hearing process because it could materially change monitoring and treatment programs built around these four components.