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EPA/OW RIN: 2040-AF89 Publication ID: Spring 2022 
Title: Unregulated Contaminant Monitoring Rule (UCMR 5) for Public Water Systems 

The Safe Drinking Water Act (SDWA), as amended in 1996, requires that EPA establish a program to monitor specified unregulated contaminants every five years. 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), the fourth (UCMR4) on December 20, 2016 (81 FR 92666), and the fifth (UCMR5) on December 27, 2021 (86 FR 73131). This action addresses SDWA requirements by establishing the terms for the fifth cycle of monitoring including a list of the new unregulated contaminants to be monitored during the UCMR 5 period of 2022 to 2026 (with sample collection expected to take place between 2023-2025). The final rule fulfills a key commitment in "EPA's 2019 Per- and Polyfluoroalkyl Substances (PFAS) Action Plan" by providing for the collection of more drinking water occurrence data for a broader group of 29 PFAS.

Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Completed Actions 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 141    40 CFR 142   
Legal Authority: 42 U.S.C. 300f et seq. Safe Drinking Water Act   
Legal Deadline:
Action Source Description Date
Final  Statutory  Five years after publication of UCMR 4. SDWA section 1445; U.S.C. 300j-4.  12/20/2021 
Action Date FR Cite
Notice  05/30/2019  84 FR 25026   
NPRM  03/11/2021  86 FR 13846   
Final Rule  12/27/2021  86 FR 73131   
Correction  01/25/2022  87 FR 3679   
Final Rule Effective  01/26/2022 
Additional Information: EPA-HQ-OW-2020-0530.
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 Information URL:   Public Comment URL:  
Sectors Affected: 221310 Water Supply and Irrigation Systems; 924110 Administration of Air and Water Resource and Solid Waste Management Programs 
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