BetaBetaDataset
To provide public access to analytical monitoring results for contaminants in drinking water that are not currently regulated under the Safe Drinking Water Act, supporting contaminant occurrence assessment.
The Safe Drinking Water Act requires the EPA to identify and monitor unregulated contaminants every five years through the Unregulated Contaminant Monitoring Rule (UCMR). UCMR 5 was published in 2021 and requires monitoring for 30 chemical contaminants, including 29 PFAS compounds and lithium, between 2023 and 2025.
The Data Finder includes analytical monitoring results from public water systems participating in UCMR 5. Data can be filtered by public water system ID or name, state, contaminant, source water type, system size, minimum reporting levels, and health-based reference concentrations
The data are collected through mandatory sampling and laboratory analysis conducted by participating public water systems under EPA UCMR 5 requirements. Public water systems collect drinking water samples according to EPA-approved sampling schedules and analytical methods, and laboratories submit results through EPA’s Safe Drinking Water Accession and Review System (SDWARS)