Is your tap water safe? Check PFAS by ZIP.*
PFAS are forever chemicals that ride in with your water, not from your pipes, and their health-based goal is effectively zero.
As of mid-2026 the federal limit is 4.0 parts per trillion each for PFOA and PFOS (the April 2024 EPA rule; water systems must meet it by 2029, which the EPA has proposed moving to 2031). Enter your ZIP or address to see what your water system has actually reported. In a study of 73 homes, under-sink reverse-osmosis filters removed more than 94 percent of it, as long as the membrane is replaced on schedule.
What you should know about PFAS in tap water.
What are PFAS in tap water?
PFAS (per- and polyfluoroalkyl substances) are a class of thousands of synthetic forever chemicals built around a carbon-fluorine bond that barely breaks down. Unlike lead, they do not come from your home’s plumbing. They enter the water supply upstream, from industrial discharge, contaminated groundwater, and firefighting foam, so what the treatment plant delivers is essentially what reaches your tap. Read the full PFAS science brief.
Is my tap water safe from PFAS?
It depends on your water system, and the honest answer is often that we do not know yet. Use the lookup above to see what your system has actually reported. A non-detect result is a clean reading for the four PFAS this panel tracks, though it is not every PFAS that carries a federal limit (PFNA and GenX are regulated too and are not in this panel). But many systems have not tested for PFAS at all, and not tested is not the same as safe. The only way to know your own tap is a direct test.
What is the legal limit for PFAS in drinking water right now?
The EPA’s April 2024 rule set the federal limit at 4.0 parts per trillion each for PFOA and PFOS. Water systems have until 2029 to meet it, and the EPA has proposed moving that to 2031, so a reading above 4.0 today is over the coming limit, not yet a violation. In 2025 the EPA also proposed dropping the limits for four other PFAS; that is a proposal, not final law. See EPA’s PFAS rule.
How do I remove PFAS from my tap water?
A reverse-osmosis filter at the kitchen tap is the most reliable point-of-use fix. In peer-reviewed testing, under-sink reverse-osmosis and two-stage filters reduced PFAS, including replacement PFAS like GenX, by 94 percent or more; common carbon pitcher and faucet filters were far less consistent. Look for certification to NSF/ANSI 58. How reverse osmosis works.
Is this the same as testing my own tap?
No. This tool shows public monitoring data (UCMR5 and utility reports) for the water system that serves your address, the same public record consumer groups publish. It does not measure the water at your own tap, and it cannot see PFAS from a private well or your own plumbing. A direct test is the only way to measure your home.
This is public utility data, and it is honest about that.*
*This lookup shows the monitoring data your water system reported (EPA UCMR5 and utility reports), the same public record consumer groups publish. It is not a Stasis water test and does not measure the water at your own tap. A system that never tested for PFAS shows as not tested, never as safe. To read your whole home, your water, air, and light together, start with a free Stasis Score from your address.
Sources cited on this page