Tap WaterIndex

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Tap water quality report

Connecticut

Across Connecticut's 505 community water suppliers, 1.4% exceed the EPA lead action level and 58.7% have detectable PFAS.

1.4%
exceed lead action level
(7/499 suppliers)
58.7%
PFOA/PFOS detected
(37/63 suppliers)
505
water suppliers
Lead by supplier PFAS by supplier

Largest water suppliers

Lead is the LCR 90th-percentile result; a value above 0.015 mg/L exceeds the EPA action level. “—” means no lead sample is on file for that supplier.
SupplierCityPopulationLead (p90)
Regional Water Authority Ansonia 418,900 0.0000 mg/L
Metropolitan District Commission Berlin 390,887 0.0000 mg/L
Aquarion-Eastern Fairfield County Beacon Falls 351,756 0.0000 mg/L
Aquarion-Stamford Darien 119,214 0.0000 mg/L
Waterbury Water Department Middlebury 107,271 0.0040 mg/L
Ctwc - Northern Reg-Western System East Granby 101,313 0.0000 mg/L
New Britain Water Department Berlin 73,534 0.0000 mg/L
Danbury Water Department Bethel 62,055 0.0000 mg/L
Meriden Water Division Berlin 58,441 0.0000 mg/L
Aquarion-Greenwich Greenwich 53,297 0.0000 mg/L
Bristol Water Department Bristol 52,079 0.0000 mg/L
Manchester Water Department Glastonbury 51,198 0.0000 mg/L
Southington Water Department Cheshire 43,069 0.0000 mg/L
South Norwalk Electric & Water Darien 42,000 0.0000 mg/L
Middletown Water Department Cromwell 41,019 0.0000 mg/L
Norwalk First Taxing District New Canaan 40,256 0.0030 mg/L
Torrington Water Company Harwinton 37,915 0.0000 mg/L
Wallingford Water Department North Haven 37,267 0.0000 mg/L
Norwich Public Utilities Bozrah 36,163 0.0000 mg/L
Aquarion Water/Nh Hampton 34,000 0.0000 mg/L
Ctwc - Shoreline Region-Guilford System Clinton 33,975 0.0000 mg/L
Mohegan Tribal Utility Authority Uncasville 31,961 0.0026 mg/L
Groton Utilities Groton 30,200 0.0000 mg/L
New London Dept. of Public Utilities New London 27,620 0.0000 mg/L
University of Connecticut - Main Campus Mansfield 27,199 0.0007 mg/L
Ctwc - Naugatuck Region-Central System Beacon Falls 22,735 0.0000 mg/L
Mashantucket Pequot Water System Mashantucket 22,171 0.0010 mg/L
Windham Water Works Mansfield 21,214 0.0043 mg/L
Aquarion-Darien Darien 18,737 0.0020 mg/L
Hazardville Water Company East Windsor 18,544 0.0007 mg/L
Aquarion-Plainville Regional Bristol 18,231 0.0000 mg/L
Waterford Wpca Montville 16,578 0.0015 mg/L
East Lyme Water & Sewer Commission East Lyme 15,245 0.0000 mg/L
Ctwc - Unionville System Avon 14,693 0.0024 mg/L
Aquarion-Simsbury Regional East Granby 14,691 0.0003 mg/L
Cromwell Fire District Water Department Berlin 14,316 0.0000 mg/L
Aquarion-New Milford Regional Brookfield 13,331 0.0020 mg/L
Aquarion-Valley Ansonia 13,080 0.0011 mg/L
Avon Water Co Avon 11,590 0.0000 mg/L
Aquarion-Mystic Groton 10,788 0.0000 mg/L
Aquarion-New Canaan New Canaan 10,097 0.0000 mg/L
Watertown Water & Sewer Authority Middlebury 9,972 0.0020 mg/L
Bethel Water Dept Bethel 9,507 0.0000 mg/L
Winsted Water Works Barkhamsted 7,784 0.0000 mg/L
Kensington Fire District Berlin 7,553 0.0022 mg/L
Aquarion-Ridgefield Ridgefield 7,476 0.0031 mg/L
Heritage Water Company Middlebury 7,300 0.0007 mg/L
Putnam Water Pollution Control Authority Putnam 7,300 0.0028 mg/L
Jewett City Water Company Griswold 6,840 0.0000 mg/L
Watertown Fire District Watertown 6,718 0.0022 mg/L
Ctwc - Crystal System Brooklyn 6,378 0.0005 mg/L
Ctwc - Naugatuck Reg-Collinsville Sys Avon 6,324 0.0000 mg/L
Aquarion-Newtown Regional Newtown 6,054 0.0040 mg/L
Ctwc - Naugatuck Reg-Terryville System Plymouth 5,607 0.0006 mg/L
Berlin Water Control Commission Berlin 5,128 0.0000 mg/L
Ctwc - Shoreline Region-Chester System Chester 5,030 0.0000 mg/L
Portland Water Department Middletown 5,010 0.0000 mg/L
Colchester Sewer & Water Commission Colchester 4,020 0.0000 mg/L
Ctwc - Naugatuck Reg-Thomaston System Plymouth 3,789 0.0028 mg/L
Ctwc - Shoreline Region-Sound View Old Lyme 3,397 0.0000 mg/L
Ledyard Wpca - Ledyard Center Ledyard 3,294 0.0000 mg/L
Aquarion-Litchfield Regional Goshen 3,097 0.0000 mg/L
Connecticut Valley Hospital Middletown 2,928 0.0000 mg/L
Worthington Fire District Berlin 2,875 0.0028 mg/L
Fairfield Hills Newtown 2,610 0.0040 mg/L
Scwa, Montville Division (Mtv) Montville 2,570 0.0025 mg/L
Scwa, Tower-Ferry View Division Ledyard 2,567 0.0033 mg/L
Wolcott Water Department Waterbury 2,550 0.0000 mg/L
Ctwc - Gallup System Plainfield 2,538 0.0023 mg/L
Groton Long Point Association Groton 2,400 0.0000 mg/L
Connecticut Correctional Institute Enfield 2,385 0.0000 mg/L
Ledyard Wpca, Gales Ferry System Groton 2,369 0.0000 mg/L
Salmon Brook District Water Dept Granby 2,151 0.0000 mg/L
Noank Fire District Groton 1,947 0.0000 mg/L
Aquarion-Salisbury Salisbury 1,932 0.0000 mg/L
Ctwc - Hebron Center Division Hebron 1,927 0.0000 mg/L
Aquarion-New Hartford New Hartford 1,872 0.0013 mg/L
Scwa, North Stonington Division (Nst) North Stonington 1,860 0.0019 mg/L
Ctwc - Plainfield System Brooklyn 1,713 0.0000 mg/L
Durham Center Division Durham 1,601 0.0000 mg/L
Aquarion-North Canaan North Canaan 1,481 0.0013 mg/L
Tariffville Fire District Water Dept Simsbury 1,477 0.0000 mg/L
Scwa, Mohegan Division Montville 1,428 0.0000 mg/L
Ctwc - Legend Hill System Madison 1,368 0.0000 mg/L
Aquarion-Marlborough Marlborough 1,348 0.0000 mg/L
Candlewood Shores Tax District Brookfield 1,315 0.0061 mg/L
Montville Water Supply Montville 1,300 0.0000 mg/L
Tolland Water Department Tolland 1,251 0.0000 mg/L
Aquarion-Woodbury Woodbury 1,209 0.0000 mg/L
Aquarion-East Derby Derby 1,101 0.0000 mg/L
Ctwc - Thompson System Thompson 1,070 0.0011 mg/L
Ctwc - Shoreline Region-Point O Woods Old Lyme 1,068 0.0000 mg/L
Sprague Water & Sewer Authority Sprague 1,058 0.0000 mg/L
Rosebrook Water Carroll 1,050 0.0480 mg/L
Aquarion Water Company Sheffield 987 0.0011 mg/L
Aquarion-Ridgefield Knolls Ridgefield 958 0.0030 mg/L
Aquarion-Norfolk Norfolk 913 0.0000 mg/L
Woodlake Tax District Woodbury 912 0.0010 mg/L
Ctwc - Amston Lake Division Colchester 910 0.0015 mg/L
Scwa, Oakdale Heights Division Montville 876 0.0076 mg/L