Is there PFAS in North Penn Water Authority water?
Yes. EPA's final UCMR 5 results show North Penn Water Authority averaged 4.7 ppt of PFOA at its worst sampling point, 1.2 times the EPA limit of 4 ppt.
North Penn Water Authority
Serves 91,941 people · 12 PFOA samples from 5 sampling points · Apr 2024 to Jan 2025
Average above an EPA limit
PFOA Perfluorooctanoic acid
4.7 ppt avg · max 5.1
PFOS Perfluorooctanesulfonic acid
not detected
Hazard index GenX, PFBS, PFNA, PFHxS combined
not detected
Also detected, no federal limit: PFBS, PFPeA.
North Penn Water Authority is a public water system drawing on surface water, based in Lansdale, Pennsylvania, serving about 91,941 people, including Doylestown, Chalfont, Colmar, Franconia, Line Lexington, Montgomeryville. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 12 times across 5 sampling points between Apr 2024 and Jan 2025.
Every PFAS detected
Not detected: PFMPA, PFHxA, PFUnA, 9Cl-PF3ONS, PFBA, 6:2 FTS, PFDoA, 8:2 FTS, 11Cl-PF3OUdS, PFMBA, PFEESA, PFHpS, HFPO-DA, NFDHA, PFPeS, 4:2 FTS, PFOS, PFNA, PFHxS, PFHpA, NMeFOSAA, PFTrDA, PFTA, PFDA, NEtFOSAA, ADONA.
Lithium, tested in the same program: highest 23.6 ppb, detected in 8 of 12 samples. EPA's health-based screening level is 10 ppb.
What the EPA limits mean here
In April 2024 EPA set enforceable limits of 4 ppt for PFOA and PFOS, 10 ppt each for PFHxS, PFNA and GenX, and a hazard index of 1 for mixtures. Utilities were given until 2029 to comply. In May 2026 EPA proposed keeping only the PFOA and PFOS limits and moving that deadline to 2031. Until that proposal is final, the 2024 limits stand.
Compliance is judged on a running annual average at each entry point, so we show the average at this system's worst sampling point next to its single highest result. UCMR 5 results do not by themselves put a utility in or out of compliance.
What you can do at home
Two routes work for PFAS. For drinking and cooking water only, a reverse osmosis system certified to NSF/ANSI 58 with a PFOA/PFOS reduction claim is the cheapest proven option. To treat every tap and shower, a whole-house carbon system with enough contact time works, but check that the maker has PFAS test data, not just a marketing claim. See the best filters for PFAS and how PFAS removal works.
Other systems in Pennsylvania
All 390 tested systems in Pennsylvania
ZIP codes served
18901 18914 18915 18924 18932 18936 18944 18960 18964 18969 18971 19348 19403 19406 19426 19438 19440 19443 19446 19451 19454 19473 19474 19490
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Cite this page
Well & Tap. "PFAS in North Penn Water Authority water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID PA1460034. https://wellandtap.com/pfas/pennsylvania/north-penn-water-authority/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID PA1460034). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
