Unregulated Contaminant Monitoring Rule (UCMR5) Public Comment Period

Today’s Federal Register contains a notice of the proposed Unregulated Contaminant Monitoring Rule (UCMR5) and seeks public comment by May 10, 2021.
 
EPA is proposing an SDWA rule that would require public water systems to collect national occurrence data for 29 PFAS and lithium. This proposed rule would require all community and nontransient 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 the data to inform EPA decisions. This proposal fulfills a key commitment in ‘‘EPA’s 2019 Per and Polyfluoroalkyl Substances (PFAS) Action Plan’’ (USEPA, 2019a) by proposing the collection of more drinking water occurrence data for a broader group of PFAS. This proposal identifies three analytical methods to support water system monitoring for a total of 30 contaminants, consisting of 29 PFAS and lithium.
 
 
Sponsors