Is there PFAS in Ctwc - Northern Reg-western System water?

Some. At least one sample reached an EPA limit, but the average at every sampling point stayed below it.

Ctwc - Northern Reg-western System is a public water system drawing on surface water, based in Clinton, Connecticut, serving about 101,313 people, including Broad Brook, Ellington, Manchester, Vernon Rockville, Somers, South Windsor. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 16 times across 1 sampling point between Mar 2024 and Jul 2025.

Every PFAS detected

Not detected: PFUnA, PFDoA, PFDA, 11Cl-PF3OUdS, PFNA, PFTrDA, PFHpA, NMeFOSAA, NEtFOSAA, PFTA, PFMBA, PFPeS, 9Cl-PF3ONS, PFEESA, PFHpS, PFMPA, 8:2 FTS, 4:2 FTS, 6:2 FTS, HFPO-DA, ADONA, NFDHA.

Lithium, tested in the same program: highest 19.8 ppb, detected in 2 of 16 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 Connecticut

• Waterbury Water Department none detected
• Aquarion Water CO of Ct-stamford 3 PFAS detected
• New Britain Water Department none detected
• Danbury Water Department above an EPA limit
• Meriden Water Division 7 PFAS detected
• Aquarion Water CO of Ct-greenwich System above an EPA limit

All 63 tested systems in Connecticut

ZIP codes served

06016 06029 06042 06066 06071 06074 06078 06082 06084 06088 06093 06096 06268 06269

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 Ctwc - Northern Reg-western System water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID CT0473011. https://wellandtap.com/pfas/connecticut/ctwc-northern-reg-western-system/

About this data

Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID CT0473011). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.