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EPA/OW RIN: 2040-AF89 Publication ID: Spring 2020 
Title: Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5) for Public Water Systems 

The Safe Drinking Water Act (SDWA), as amended in 1996, requires that the EPA establish a program to monitor specified unregulated contaminants every five years. The EPA published the first Unregulated Contaminant Monitoring Rule (UCMR 1) in the Federal Register on September 17, 1999 (64 FR 50556), the second (UCMR 2) on January 4, 2007 (72 FR 368), the third (UCMR 3) on May 2, 2012 (77 FR 26072), and the fourth (UCMR4) on December 20, 2016 (81 FR 92666). This action addresses the SDWA requirements by proposing the terms for the next cycle of monitoring and drafting a list of the new unregulated contaminants proposed to be monitored during the UCMR 5 period of 2022 to 2026. The proposal will fulfill a key commitment in EPA’s 2019 Per- and Polyfluoroalkyl Substances (PFAS) Action Plan” ( by proposing the collection of more drinking water occurrence data for a broader group of PFAS.

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 
EO 13771 Designation: Other 
CFR Citation: 40 CFR 141    40 CFR 142   
Legal Authority: 42 U.S.C. 300f et seq., Safe Drinking Water Act   
Legal Deadline:  None
Action Date FR Cite
Notice  05/30/2019  84 FR 25026   
NPRM  09/00/2020 
Final Rule  12/00/2021 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State, Tribal 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Brenda Bowden
Environmental Protection Agency
Office of Water
Mail Code 140, 26 West Martin Luther King Drive,
Cincinnati, OH 45268
Phone:513 569-7961

Melissa Simic
Environmental Protection Agency
Office of Water
26 West Martin Luther King Drive,
Cincinnati, OH 45268
Phone:513 569-7864