Pace Analytical® has more than 30 years of experience providing comprehensive drinking water testing services to a broad range of clients including public and private utilities. Having analyzed upwards of 100,000 samples under EPA UCMR 3 and 4 programs, the Pace UCMR team is nationally recognized; and its members are regular presenters at the nation’s water utility conferences.

UCMR 5 sampling is scheduled to take place from January 2023 to December 2025.
In anticipation of this event, the Pace team started preparations in 2019.


On 1/19/21, the U.S. EPA announced its intent to issue the UCMR 5 proposal for public comment. The public comment period (60 days) will not begin until official notification in the Federal Register. The EPA will review the comments, potentially change the proposal, and issue the final UCMR version late 2021. Here are some key pieces of information about the UCMR 5 proposal:

  • On 1/20/21, the incoming Biden administration issued a regulatory freeze on all pending rules that includes this proposal. The freeze puts the proposal on hold until the new EPA administrator or designee can review and approve it. The freeze also includes a stipulation that any rule that has been published in the Federal Register or issued in any other manner that has not gone into effect be postponed for further review.
  • The current version of the proposal would require all public water systems that serve 3,300 or more consumers to sample each entry point to the distribution system for 30 contaminants that include PFAS and Lithium. Up until the 1/19/21 announcement, the EPA has been considering the inclusion of 29 additional contaminants. During the course of its review of responses to the proposal, the EPA may add more contaminants to the required list when the Rule is made final in late 2021.
  • The current version of the proposal would require public water systems to identify potential and/or historical sources of PFAS from a list of 23 different categories.

We will update this page as new information becomes available. In the meantime, if you have questions, please contact us.