PFAS in Connecticut tap water

35 of 63 tested systems measured above the federal limit. 40 had a detection of any kind.

Every public water system below was required by the EPA to test for 29 PFAS compounds. Sorted by the highest PFOA or PFOS reading, worst first. Find yours for the full set of readings and what removes them.

Water systemHighest PFOAHighest PFOSFoundAgainst the 4 ppt limit
Norwich Public Utilities6.7 ppt16.2 ppt5 of 29Above
Manchester Water Department13 ppt16 ppt7 of 29Above
Aquarion Water Co of Ct-newtown System15.9 ppt12.7 ppt8 of 29Above
Wallingford Water Departmentnone detected13.9 ppt3 of 29Above
Ctwc - Shoreline Region-guilford System6 ppt12 ppt7 of 29Above
Norwalk First Taxing District9.5 ppt11.2 ppt6 of 29Above
Aquarion Water Co of Ct-main System10.9 ppt6.6 ppt7 of 29Above
Regional Water Authority7.1 ppt10.7 ppt4 of 29Above
Aquarion Water Co of Ct-ridgefield Sys10.6 ppt6.1 ppt7 of 29Above
Ctwc - Crystal System9.9 ppt6.8 ppt4 of 29Above
Meriden Water Division6.1 ppt9.5 ppt7 of 29Above
East Lyme Water & Sewer Commission9.2 ppt7.2 ppt6 of 29Above
Colchester Sewer & Water Commissionnone detected9 ppt2 of 29Above
Hazardville Water Company8.6 ppt5.4 ppt6 of 29Above
Putnam Water Pollution Control Authority8.5 ppt7.5 ppt5 of 29Above
Aquarion Water Co of Ct-valley System8.1 ppt6.9 ppt6 of 29Above
Avon Water Co.7 ppt8 ppt4 of 29Above
Ctwc - Northern Reg-western System8 ppt6 ppt7 of 29Above
Southington Water Department8 ppt6 ppt7 of 29Above
Valley Water Systems, Inc.5.2 ppt6.8 ppt3 of 29Above
Aquarion Water Co of Ct-tlwc Woodrich6.3 ppt6.2 ppt5 of 29Above
Ctwc - Unionville System6 ppt6 ppt6 of 29Above
Bethel Water Dept5.9 pptnone detected3 of 29Above
Aquarion Water Co of Ct-noroton System5.8 pptnone detected4 of 29Above
Aquarion Water Co of Ct-greenwich System5.6 ppt4.1 ppt4 of 29Above
Aquarion Water Co of Ct-new Canaan Sys5.6 pptnone detected3 of 29Above
Ctwc - Naugatuck Reg-collinsville Sys4.9 ppt5.6 ppt2 of 29Above
Danbury Water Department5.4 pptnone detected4 of 29Above
Aquarion Water Co of Ct-new Milford5.3 ppt5.3 ppt5 of 29Above
University of Connecticut - Main Campusnone detected5 ppt2 of 29Above
Cromwell Fire District Water Departmentnone detected4.6 ppt2 of 29Above
Aquarion Water Co of Ct-simsbury System4.4 ppt4.3 ppt4 of 29Above
Aquarion Water Co of Ct-stamford4.3 pptnone detected3 of 29Above
Bristol Water Department4.1 pptnone detected2 of 29Above
Heritage Water Company4.1 pptnone detected2 of 29Above
Aquarion Water Co of Ct-litchfield Sysnone detectednone detected0 of 29Within
Aquarion Water Co of Ct-mysticnone detectednone detected1 of 29Within
Berlin Water Control Commissionnone detectednone detected1 of 29Within
Ctwc - Coventry Hills Divnone detectednone detected0 of 29Within
Ctwc - Naugatuck Reg-terryville Systemnone detectednone detected0 of 29Within
Ctwc - Naugatuck Reg-thomaston Systemnone detectednone detected0 of 29Within
Ctwc - Naugatuck Region-central Systemnone detectednone detected0 of 29Within
Ctwc - Shoreline Region-chester Systemnone detectednone detected0 of 29Within
Greenwich American Centernone detectednone detected0 of 29Within
Groton Utilitiesnone detectednone detected0 of 29Within
Jewett City Water Companynone detectednone detected1 of 29Within
Kensington Fire Districtnone detectednone detected0 of 29Within
Metropolitan District Commissionnone detectednone detected0 of 29Within
Middlebury Hamletnone detectednone detected0 of 29Within
Middletown Water Departmentnone detectednone detected0 of 29Within
New Britain Water Departmentnone detectednone detected0 of 29Within
New Hartford Water Departmentnone detectednone detected0 of 29Within
New London Dept. of Public Utilitiesnone detectednone detected0 of 29Within
Portland Water Departmentnone detectednone detected2 of 29Within
South Norwalk Electric & Waternone detectednone detected0 of 29Within
Sterling Engineering Corp.none detectednone detected0 of 29Within
Torrington Water Companynone detectednone detected0 of 29Within
Waterbury Water Departmentnone detectednone detected0 of 29Within
Waterford Wpcanone detectednone detected0 of 29Within
Watertown Fire Districtnone detectednone detected0 of 29Within
Watertown Water & Sewer Authoritynone detectednone detected0 of 29Within
Windham Water Worksnone detectednone detected1 of 29Within
Winsted Water Worksnone detectednone detected0 of 29Within

All 63 systems the EPA tested in Connecticut, every one of them with its own page. Each was tested for 29 PFAS compounds.

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Source, the EPA’s fifth Unregulated Contaminant Monitoring Rule, final dataset published 2026-10-15. Original data →