On December 20, 2021, the U.S. Environmental Protection Agency finalized the Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) to establish nationwide monitoring for 29 per- and polyfluoroalkyl substances (PFAS) and lithium in drinking water. Distilled to its essence, the new rule requires certain public water systems to collect data for 29 PFAS, as well as lithium, over a five-year period, with preliminary preparations beginning in 2022. According to the summary of the rule, published by the EPA, UCMR 5 “will provide new data critically needed …
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