What PFAS did they find in your water?
EPA sampled 10,313 public water systems for 29 PFAS between 2023 and 2025. Enter a US ZIP code to read what your system reported — the compounds detected, the highest result, and what it means.
Data: US EPA UCMR 5 final occurrence data, file dated 2026-10-15, aggregated here per system (method and files). A result is reported only at or above the reporting level: for PFOA and PFOS that level is 4 ng/L, the same as the 2024 federal limit — so "not detected" means below 4 ng/L, not zero. Small systems were sampled in a representative subset, so some ZIPs have no system listed.
No UCMR 5 system is listed for that ZIP. Your supplier may be a small system that was not in the sample, or the ZIP may be served under a neighbouring one — try the ZIP of your water utility's office, or ask the utility for its PFAS results.
What to do with the number
If PFOA or PFOS was detected, your system reported at least 4 ng/L in at least one sample — the level at which the 2024 federal rule requires action over the coming years. Ask the utility what it has done since; the UCMR 5 samples are from 2023–2025. If you want to act at the tap now, the one thing that reliably works is a filter certified to NSF/ANSI 53 or 58 for PFAS reduction, checked in the certifier's own listing. A private well is not in this data: test it through a state-certified lab.