Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5) for Public Water Systems and Announcement of Public Meeting

The U.S. Environmental Protection Agency (EPA or Agency) is proposing a Safe Drinking Water Act (SDWA) rule that would require public water systems to collect national occurrence data for 29 per- and polyfluoroalkyl substances (PFAS) and lithium. This proposed rule would require all community and non-transient non community water systems serving 3,300 or more people, and a representative sample of smaller water systems, to conduct monitoring. PFAS and lithium are not currently subject to national primary drinking water regulations, and EPA is proposing to require the collection of drinking water occurrence data to inform EPA decisions. This proposal fulfills a key commitment in “EPA’s 2019 Per- and Polyfluoroalkyl Substances (PFAS) Action Plan” (https://www.epa.gov/pfas/epas-pfas-action-plan) by proposing the collection of more drinking water occurrence data for a broader group of PFAS. EPA is also announcing two public meetings (via webinar) to discuss this proposal of the fifth Unregulated Contaminant Monitoring Rule (UCMR 5).