Via Data is Plural: “Through the Unregulated Contaminant Monitoring Rule, the Environmental Protection Agency “collect[s] data for contaminants that are suspected to be present in drinking water and do not have health-based standards set under the Safe Drinking Water Act.” The current version of the rule requires public water systems to test for lithium and 29 per- and polyfluoroalkyl substances, better known as PFAS. (Prior iterations, which go back to the early 2000s, have tested for other contaminants.) The EPA publishes the data collected, with the most detailed files listing each sample, its public water system, facility, sampling point, sample date, contaminant tested, concentration detected, and more. Related: Last week, the EPA finalized its first-ever limits for PFAS in drinking water. [h/t Lisa Sorg]