Is there PFAS in Hamilton Public Water System water?
Some. At least one sample reached an EPA limit, but the average at every sampling point stayed below it.
Hamilton Public Water System
Serves 62,447 people · 4 PFOA samples from 2 sampling points · May 2024 to Nov 2024
One or more samples at an EPA limit
PFOA Perfluorooctanoic acid
2.6 ppt avg · max 5.3
PFOS Perfluorooctanesulfonic acid
not detected
PFHxS Perfluorohexanesulfonic acid
2.1 ppt avg · max 4.1
Hazard index GenX, PFBS, PFNA, PFHxS combined
0.2 avg · max 0.4
Also detected, no federal limit: PFBS.
Hamilton Public Water System is a public water system drawing on groundwater, based in Fairfield, Ohio, serving about 62,447 people, including Hamilton, Fairfield. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 4 times across 2 sampling points between May 2024 and Nov 2024.
Every PFAS detected
Not detected: PFPeS, PFDoA, PFHxA, PFUnA, 11Cl-PF3OUdS, 9Cl-PF3ONS, ADONA, HFPO-DA, PFMPA, PFPeA, PFMBA, PFNA, NFDHA, PFOS, PFHpS, PFBA, 6:2 FTS, 4:2 FTS, 8:2 FTS, PFTA, PFTrDA, NEtFOSAA, NMeFOSAA, PFEESA, PFHpA, PFDA.
Lithium, tested in the same program: not detected.
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 Ohio
All 347 tested systems in Ohio
ZIP codes served
45011 45013 45014 45015
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 Hamilton Public Water System water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID OH0904012. https://wellandtap.com/pfas/ohio/hamilton-public-water-system/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID OH0904012). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
