All water systems in Connecticut
2,334 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Ctwc Naugatuck Reg-Collinsville Sys Avon, Burlington, Canton and 1 more · Hartford County |
6,324 | 0 | 0 | |
|
Aquarion-Newtown Regional Newtown · Fairfield County |
6,054 | 1 | 1 | |
|
Ctwc Naugatuck Reg-Terryville System Plymouth · Litchfield County |
5,607 | 0 | 0 | |
|
Berlin Water Control Commission Berlin, Middletown, Newington · Hartford County |
5,128 | 5 | 2 | |
|
Ctwc Shoreline Region-Chester System Chester, Deep River, Essex · Middlesex County |
5,030 | 0 | 0 | |
|
Portland Water Department Middletown, Portland · Middlesex County |
5,010 | 1 | 0 | |
|
Colchester Sewer & Water Commission Colchester · New London County |
4,020 | 4 | 0 | |
|
Ctwc Naugatuck Reg-Thomaston System Plymouth, Thomaston · Litchfield County |
3,789 | 0 | 0 | |
|
Ctwc Shoreline Region-Sound View Old Lyme · New London County |
3,397 | 0 | 0 | |
|
Ledyard Wpca Ledyard Center Ledyard · New London County |
3,294 | 3 | 1 | |
|
Aquarion-Litchfield Regional Goshen, Litchfield, Torrington · Litchfield County |
3,097 | 0 | 0 | |
|
Connecticut Valley Hospital Middletown · Middlesex County |
2,928 | 1 | 0 | |
|
Worthington Fire District Berlin · Hartford County |
2,875 | 3 | 0 | |
|
Pratt & Whitney Middletown · Middlesex County |
2,800 | 0 | 0 | |
|
Fairfield Hills Newtown · Fairfield County |
2,610 | 3 | 2 | |
|
Weston Schools and Municipal Buildings Weston · Fairfield County |
2,600 | 2 | 0 | |
|
Ridgefield High and Middle School Ridgefield · Fairfield County |
2,575 | 1 | 1 | |
|
Scwa, Montville Division (mtv) Montville · New London County |
2,570 | 0 | 0 | |
|
Scwa, Tower-Ferry View Division Ledyard · New London County |
2,567 | 1 | 1 | |
|
Wolcott Water Department Waterbury, Wolcott · New Haven County |
2,550 | 0 | 0 | |
|
Ctwc Gallup System Plainfield · Windham County |
2,538 | 0 | 0 | |
|
Groton Long Point Association Groton · New London County |
2,400 | 2 | 0 | |
|
Connecticut Correctional Institute Enfield, Somers · Hartford County |
2,385 | 1 | 0 | |
|
Ledyard Wpca, Gales Ferry System Groton, Ledyard · New London County |
2,369 | 1 | 0 | |
|
Salmon Brook District Water Dept Granby · Hartford County |
2,151 | 2 | 0 | |
|
Noank Fire District Groton · New London County |
1,947 | 2 | 0 | |
|
Aquarion-Salisbury Salisbury · Litchfield County |
1,932 | 0 | 0 | |
|
Ctwc Hebron Center Division Hebron · Tolland County |
1,927 | 0 | 0 | |
|
Aquarion-New Hartford New Hartford · Litchfield County |
1,872 | 1 | 0 | |
|
Scwa, North Stonington Division (nst) North Stonington · New London County |
1,860 | 1 | 1 | |
|
Ctwc Plainfield System Brooklyn, Killingly, Plainfield · Windham County |
1,713 | 0 | 0 | |
|
Durham Center Division Durham · Middlesex County |
1,601 | 2 | 1 | |
|
Aquarion-North Canaan North Canaan · Litchfield County |
1,481 | 0 | 0 | |
|
Tariffville Fire District Water Dept Simsbury · Hartford County |
1,477 | 3 | 1 | |
|
Leonard J.tyl Middle School&high School Montville · New London County |
1,466 | 1 | 1 | |
|
Scwa, Mohegan Division Montville · New London County |
1,428 | 0 | 0 | |
|
New Fairfield Elementary School New Fairfield · Fairfield County |
1,425 | 3 | 2 | |
|
Killingly High School & Agricultural Ctr Killingly · Windham County |
1,400 | 2 | 1 | |
|
New Fairfield High/middle School New Fairfield · Fairfield County |
1,400 | 5 | 0 | |
|
Ctwc Legend Hill System Madison · New Haven County |
1,368 | 0 | 0 | |
|
Aquarion-Marlborough Marlborough · Hartford County |
1,348 | 0 | 0 | |
|
Candlewood Shores Tax District Brookfield, New Fairfield · Fairfield County |
1,315 | 2 | 0 | |
|
Montville Water Supply Montville, Waterford · New London County |
1,300 | 0 | 0 | |
|
Coventry High & Nathan Hale Schools Coventry · Tolland County |
1,252 | 1 | 1 | |
|
Tolland Water Department Tolland · Tolland County |
1,251 | 0 | 0 | |
|
Lone Oak Campground North Canaan · Litchfield County |
1,250 | 3 | 0 | |
|
Aquarion-Woodbury Woodbury · Litchfield County |
1,209 | 0 | 0 | |
|
Woodstock Academy Woodstock · Windham County |
1,125 | 3 | 2 | |
|
Region 18 Schools Lyme Street Old Lyme · New London County |
1,102 | 0 | 0 | |
|
Aquarion-East Derby Derby, Orange · New Haven County |
1,101 | 1 | 1 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules currently in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Connecticut records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.