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EPA/OW RIN: 2040-AG33 Publication ID: Fall 2024 
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 unregulated contaminants every five years. The EPA published the rule defining the fifth cycle of monitoring (UCMR 5) on December 27, 2021 (86 FR 73131) covering 2022-2026. 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. To prepare for this future action, the agency: (1) solicited public input on the development of drinking water analytical methods for emerging contaminants in drinking water, particularly those listed on the agency’s Fifth Contaminant Candidate List (CCL 5), that might support monitoring under UCMR 6; (2) held a pre-proposal public webinar to discuss potential approaches to develop UCMR 6 and included time for public discussion; (3) hosted an informational webinar for Tribal government representatives to discuss the development of UCMR 6 and Tribal Consultation efforts; (4) held an informational webinar for state representatives to discuss potential approaches to UCMR 6 development and the implementation of the rule; and (5) seek public comment through the publication of the proposal. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: Undetermined  Unfunded Mandates: Undetermined 
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    SDWA   
Legal Deadline:
Action Source Description Date
Other  Statutory  Statutory: SDWA (Section 1445; USC 300j-4) requires EPA to issue a list of unregulated contaminants to be monitored by public water systems every five years. The next cycle is 2027-2031.  12/27/2026 
Timetable:
Action Date FR Cite
Notice  02/08/2024  89 FR 8584   
Comment Period End  04/08/2024 
NPRM  11/00/2025 
Final Action  04/00/2027 
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

Rachel Kaiser
Environmental Protection Agency
Office of Water
26 West Martin Luther King Drive, MS-140,
Cincinnati, OH 45268
Phone:516 569-7835
Email: kaiser.rachel@epa.gov