Is there PFAS in Ambler Boro Water Dept water?
Yes. EPA's final UCMR 5 results show Ambler Boro Water Dept averaged 14.1 ppt of PFOA at its worst sampling point, 3.5 times the EPA limit of 4 ppt.
Ambler Boro Water Dept
Serves 20,000 people · 20 PFOA samples from 9 sampling points · Aug 2024 to May 2025
Average above an EPA limit
PFOA Perfluorooctanoic acid
14.1 ppt avg · max 15.3
PFOS Perfluorooctanesulfonic acid
12.6 ppt avg · max 13.7
PFHxS Perfluorohexanesulfonic acid
4.6 ppt avg · max 5.0
PFNA Perfluorononanoic acid
11.7 ppt avg · max 13.5
Hazard index GenX, PFBS, PFNA, PFHxS combined
1.6 avg · max 1.8
Also detected, no federal limit: PFPeA, PFHxA, PFBA, PFBS, PFHpA, 6:2 FTS.
Ambler Boro Water Dept is a public water system drawing on surface water, based in Ambler, Pennsylvania, serving about 20,000 people, including Ambler, Fort Washington, Kimberton. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 20 times across 9 sampling points between Aug 2024 and May 2025.
Every PFAS detected
Not detected: PFEESA, 11Cl-PF3OUdS, 9Cl-PF3ONS, ADONA, HFPO-DA, PFUnA, 4:2 FTS, 8:2 FTS, PFHpS, NFDHA, PFTA, PFMBA, PFPeS, PFMPA, NMeFOSAA, NEtFOSAA, PFTrDA, PFDoA, PFDA.
Lithium, tested in the same program: highest 22.4 ppb, detected in 14 of 20 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
19002 19034 19442
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 Ambler Boro Water Dept water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID PA1460020. https://wellandtap.com/pfas/pennsylvania/ambler-boro-water-dept/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID PA1460020). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
