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EPA/OW RIN: 2040-AG36 Publication ID: 2026 
Title: National Primary Drinking Water Regulation for Perchlorate 
Abstract:

The EPA is developing a National Primary Drinking Water Regulation (NPDWR) for perchlorate under the authority of the Safe Drinking Water Act (SDWA) and as required by a court order. The EPA is obligated to issue a proposed NPDWR for perchlorate by January 2, 2026, and a final regulation by May 21, 2027.

 
Agency: Environmental Protection Agency(EPA)  Priority: Economically Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Long-Term Actions 
Major: Yes  Unfunded Mandates: No 
EO 14192 Designation: Regulatory 
CFR Citation: 40 CFR 141   
Legal Authority: 42 U.S.C. 300   
Legal Deadline:
Action Source Description Date
NPRM  Judicial  Consent Decree: In May 2023, the D.C. Circuit vacated and remanded EPA’s 2020 withdrawal of its’ determination not to regulate perchlorate, resulting in a modified Consent Decree deadline.  01/02/2026 
Final  Judicial  Consent Decree: After the DC Circuit vacated and remanded EPA’s July 2020 final determination, the EPA and NRDC modified the Consent Decree deadlines.  05/21/2027 
Timetable:
Action Date FR Cite
NPRM  01/06/2026  91 FR 398   
Final Rule  07/00/2027 
Regulatory Flexibility Analysis Required: Undetermined  Government Levels Affected: Federal, Local, State, Tribal 
Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Anne Lausier
Environmental Protection Agency
Office of Water
1201 Constitution Avenue NW,
Washington, DC 20004
Phone:202 564-0518
Email: lausier.anne@epa.gov