EPA Moves Forward with Proposed Fifth Unregulated Contaminant Monitoring Rule by ACWA Staff Mar 11, 2021 Water News WASHINGTON, D.C. – The U.S. Environmental Protection Agency (EPA) today published the proposed fifth Unregulated Contaminant Monitoring Rule (UCMR 5) for public water systems and announced corresponding public meetings. The UCMR 5 was initially on hold due to a regulatory freeze issued on the first day of the Biden Administration. After further review, EPA determined that the UCMR 5 is consistent with EPA’s efforts to address PFAS in drinking water and published the proposed rule in the Federal Register. The proposed UCMR 5 would require public water systems to collect national occurrence data for 29 PFAS and lithium. There will be a 60-day comment period with comments due on May 10. EPA is hosting two identical virtual public meetings on April 6 and 7. ACWA members interested in learning more about the UCMR 5 can register for the webinars online. ACWA plans to weigh in during the public comment period. For questions regarding the UCMR 5, please contact Federal Relations Representative Madeline Voitier.