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Search EPA's final UCMR 5 test results for PFAS (“forever chemicals”) by water system name, city or ZIP code. Results are for public water systems, not individual homes.
Search runs in your browser. A ZIP code can be served by several water systems; check your water bill or utility to confirm yours.
UCMR 5 is a one-time EPA monitoring program, not a compliance determination. The values shown are the highest single sample result at any of the system's sampling points; one result above 4.0 ppt does not mean the system violates the PFAS rule, which is judged on running annual averages under separate compliance monitoring. Results describe the public water system, not an individual home.
Under the fifth Unregulated Contaminant Monitoring Rule (UCMR 5), public water systems sampled their treated water for 29 PFAS and lithium between January 2023 and December 2025. EPA required all systems serving more than 10,000 people to take part, and, subject to funding, systems serving 3,300–10,000 people and a nationally representative sample of smaller systems. Many small systems were therefore not tested; if yours is not listed, that does not mean it has no PFAS. EPA released the final dataset in August 2026 (EPA UCMR occurrence data ↗).
For each system we show the highest single result for each PFAS across all its sampling points, how many samples had a detection, and the sampling dates. Results below EPA's minimum reporting level (4 ppt for PFOA and PFOS) are shown as “not detected”, which does not mean zero.
In April 2024 EPA set enforceable limits (MCLs) of 4.0 ppt each for PFOA and PFOS, plus 10 ppt for PFHxS, PFNA and HFPO-DA (GenX) and a Hazard Index for mixtures, with compliance based on a running annual average at each sampling point and due in 2029 (EPA ↗). In May 2026 EPA proposed letting systems request two more years for PFOA/PFOS (to April 2031) and rescinding the PFHxS, PFNA, GenX and Hazard Index limits (EPA: extension proposal ↗ · EPA: rescission proposal ↗). These are proposals, not final rules, as of the date this page was built.
EPA lists water systems on tribal lands by EPA region, and the Navajo Nation separately.
In Connecticut, Massachusetts, New York and New Jersey you can also look up an address in the utility's lead service line inventory; 266 of those utilities' pages also show their PFAS results.