Is there PFAS in Norwalk First Taxing District water?

Yes. EPA's final UCMR 5 results show Norwalk First Taxing District averaged 5.0 ppt of PFOA at its worst sampling point, 1.3 times the EPA limit of 4 ppt.

Norwalk First Taxing District is a public water system drawing on surface water, based in Norwalk, Connecticut, serving about 40,256 people, including New Canaan, Norwalk, Westport, Wilton. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 6 times across 1 sampling point between Nov 2023 and Sep 2024.

Every PFAS detected

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

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

• Middletown Water Department none detected
• South Norwalk Electric & Water none detected
• Torrington Water Company none detected
• Southington Water Department above an EPA limit
• Wallingford Water Department 3 PFAS detected
• Norwich Public Utilities 5 PFAS detected

All 63 tested systems in Connecticut

ZIP codes served

06840 06850 06851 06855 06880 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 Norwalk First Taxing District water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID CT1030011. https://wellandtap.com/pfas/connecticut/norwalk-first-taxing-district/

About this data

Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID CT1030011). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.