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EPA/OW RIN: 2040-AG33 Publication ID: Fall 2023 
Title: ●Revisions to Establish the Sixth Unregulated Contaminant Monitoring Rule (UCMR 6) for Public Water Systems 
Abstract:

The Safe Drinking Water Act (SDWA), as amended in 1996, requires that the EPA establish a program to monitor up to 30 unregulated contaminants every five years. EPA published the rule defining the fifth cycle of monitoring (UCMR 5) on December 27, 2021 (86 FR 73131). This upcoming action meets the SDWA requirement by establishing the terms for the next (sixth) cycle of monitoring and identifying the new unregulated contaminants to be monitored during the five-year UCMR 6 period of 2027-2031. Monitoring preparations are anticipated in 2027, with sample collection between 2028-2030 and reporting concluding in 2031.

 
Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Long-Term Actions 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 141.35    40 CFR 141.40   
Legal Authority: 42 U.S.C. 300f    42 U.S.C. 300j    42 U.S.C. 300g   
Legal Deadline:
Action Source Description Date
Final  Statutory  SDWA (Section 1445; USC 300j-4) requires EPA to issue a list of up to 30 unregulated contaminants to be monitored by public water systems every five years. The next cycle is 2027-2031.  12/31/2026 
Timetable:
Action Date FR Cite
NPRM  05/00/2025 
Final Action  11/00/2026 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State, Tribal 
Federalism: Undetermined 
Included in the Regulatory Plan: No 
RIN Information URL: https://www.epa.gov/dwucmr/  
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
Email: bowden.brenda@epa.gov