Trump EPA proposed UCMR5 focuses largely on PFAS

The Trump EPA in its final days signed off on a proposed rule to require monitoring of 30 unregulated contaminants in drinking water systems, focusing on 29 per- and polyfluoroalkyl substances (PFAS) and lithium, but the proposed rule has yet to appear in the Federal Register and is undergoing review by the Biden administration. The proposed fifth unregulated contaminant monitoring rule (UCMR 5) would require all community and non-transient non community water systems serving 3,300 or more people, and...