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EPA/OW RIN: 2040-AG53 Publication ID: Spring 2025 
Title: ●Withdrawal of Regulatory Determinations and removal of Related Provisions for Four PFAS Substances (PFHxS, PFNA, HFPO-DA (GenX), and the mixture of these three PFAS plus PFBS) 
Abstract:

The Environmental Protection Agency intends to propose to withdraw its regulatory determinations to regulate four per- and polyfluoroalkyl substances (PFAS)perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), hexafluoropropylene oxide dimer acid and its ammonium salt (HFPO-DA, commonly known as GenX), and the mixture of these three PFAS plus perfluorobutane sulfonic acid (PFBS)under the Safe Drinking Water Act. EPA also intends to propose to rescind all associated regulatory provisions associated with the Final PFAS NPDWR (89 FR 32532) currently codified in 40 CFR part 141 and 142 exclusive to these PFAS that were promulgated pursuant to the regulatory determinations that EPA is now proposing to withdraw.

 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
EO 14192 Designation: Deregulatory 
CFR Citation: Not Yet Determined     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: 42 U.S.C. 300f et seq Safe Drinking Water Act   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  09/00/2025 
Final Action  02/00/2026 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State, Tribal 
Small Entities Affected: No  Federalism: Undetermined 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Alexis Lan
Environmental Protection Agency
Office of Water
1200 Pennsylvania Avenue NW, 4601M,
Washington, DC 20460
Phone:202 564-0841
Email: lan.alexis@epa.gov