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EPA/OW RIN: 2040-AG36 Publication ID: Fall 2024 
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 has committed to issuing a proposed NPDWR for perchlorate by November 21, 2025, and a final regulation by May 21, 2027.

 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 141   
Legal Authority: 42 U.S.C. 300   
Legal Deadline:
Action Source Description Date
NPRM  Judicial  U.S. District Court for Southern District of NY.  11/21/2025 
Final  Judicial  U.S. District Court for Southern District of NY.  05/28/2027 
Timetable:
Action Date FR Cite
NPRM  11/00/2025 
Final Rule  05/00/2027 
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:
Richard Weisman
Environmental Protection Agency
Office of Water
Mail Code 4607M, 1200 Pennsylvania Avenue NW,
Washington, DC 20460
Phone:202 564-2822
Email: weisman.richard@epa.gov