Tap Water Results

Connecticut tap water quality

476 community water systems serving 2.8 million people.

Data: U.S. EPA · How we read the data · How we check it

29
systems with PFAS above a federal limit
1.2 million
people served by them
62
systems EPA tested for PFAS
1
systems above the lead action level

PFAS: EPA's 2023–2025 testing. Lead: results from the last five years.

Water systems with PFAS above the federal limit

Based on EPA's UCMR 5 results (2023–2025) compared to the April 2024 limits, the way EPA compares them. Systems have until 2029 to comply. Largest first.

Connecticut PFAS report: chart, rankings and data to download →

Connecticut's own PFAS limits

Action level (not enforceable): PFOS 10 ppt, PFNA 12 ppt, PFOA 16 ppt, HFPO-DA 19 ppt, PFHxS 49 ppt, PFHxA 240 ppt, PFBS 760 ppt, PFBA 1800 ppt.

CT DPH health-based action levels (June 2022 / June 2023). Also 6:2 Cl-PFESA 2 and 8:2 Cl-PFESA 5 ng/L. Replaced earlier summed approach.

Source: CT DPH Drinking Water Section: Per- and Polyfluoroalkyl Substances, checked 2026-11-14. Utility pages compare each system's EPA results with these limits. State compliance is judged on the state's own sampling.

Largest water systems in Connecticut

Connecticut cities and towns

Most health-based violations since 2016

All Connecticut utilities on this site

Every Connecticut system serving 50,000+ people or with PFAS above a federal limit, A to Z. Download all 476 systems as CSV.

Questions

Does Connecticut tap water have PFAS?

EPA tested 62 community water systems in Connecticut for 29 PFAS between 2023 and 2025. 37 had at least one regulated PFAS detected, and 29 had an entry-point average above a 2024 federal limit. Those 29 systems serve about 1.2 million people (43% of people on community water in Connecticut). Systems have until 2029 to meet the limits.

How many Connecticut water systems have violations?

199 systems in Connecticut had at least one health-based violation since 2016 (410 violations in total). 386 violations are currently listed as unaddressed.

Which Connecticut water systems are over the lead action level?

1 system had a lead 90th percentile above the 15 ppb action level in their most recent results from the last five years. Lead depends on each home's pipes, so a test of your own tap is the only way to know your level.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.