Revisions to Establish the Sixth Unregulated Contaminant Monitoring Rule (UCMR 6) for Public Water Systems

9 organizations filed 11 public comments on Revisions to Establish the Sixth Unregulated Contaminant Monitoring Rule (UCMR 6) for Public Water Systems, at the Environmental Protection Agency. The comment window closes Sep 1, 2026.

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 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. Related Docket: EPA-HQ-OW-2020-0530

Commenters (9)

• American Water Works Associationtrade assoc.

  2 filings · confidence 97%
• U.S. Chamber of Commerce

  2 filings · confidence 97%
• American Chemistry Counciltrade assoc.

  1 filing · confidence 97%
• American Water Works Association (AWWA).trade assoc.

  1 filing · confidence 85%
• Association of Metropolitan Water Agenciestrade assoc.

  1 filing · confidence 97%
• Association of State Drinking Water Administratorstrade assoc.

  1 filing · confidence 85%
• California-Nevada Section of the American Water Works Associationtrade assoc.

  1 filing · confidence 85%
• Natural Resources Defense Council (NRDC)trade assoc.

  1 filing · confidence 97%
• United Chemical Technologiesunverified attribution

  1 filing · confidence 70%