Is there PFAS in Aquarion Water CO of Ct-main System water?
Yes. EPA's final UCMR 5 results show Aquarion Water CO of Ct-main System averaged 10.9 ppt of PFOA at its worst sampling point, 2.7 times the EPA limit of 4 ppt.
Aquarion Water CO of Ct-main System
Serves 351,756 people · 14 PFOA samples from 3 sampling points · Jan 2023 to Feb 2024
Average above an EPA limit
PFOA Perfluorooctanoic acid
10.9 ppt avg
PFOS Perfluorooctanesulfonic acid
6.6 ppt avg
Hazard index GenX, PFBS, PFNA, PFHxS combined
not detected
Also detected, no federal limit: PFBA, PFHxA, PFPeA, PFBS, PFHpA.
Aquarion Water CO of Ct-main System is a public water system drawing on surface water, based in Shelton, Connecticut, serving about 351,756 people, including Monroe, Shelton, Bridgeport, Trumbull, Easton, Stratford. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 14 times across 3 sampling points between Jan 2023 and Feb 2024.
Every PFAS detected
Not detected: 11Cl-PF3OUdS, PFNA, PFHxS, NMeFOSAA, NEtFOSAA, PFTrDA, PFTA, PFDA, PFDoA, 4:2 FTS, PFUnA, PFHpS, 9Cl-PF3ONS, ADONA, HFPO-DA, 6:2 FTS, 8:2 FTS, PFMPA, PFMBA, PFEESA, NFDHA, PFPeS.
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 Connecticut
All 63 tested systems in Connecticut
ZIP codes served
06468 06484 06604 06605 06606 06607 06608 06610 06611 06612 06614 06615 06824 06825 06880 06883 06890 06897
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 Aquarion Water CO of Ct-main System water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID CT0150011. https://wellandtap.com/pfas/connecticut/aquarion-water-co-of-ct-main-system/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID CT0150011). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
