Tap Truth EPA drinking water records, in plain English

State drinking water records

Connecticut drinking water systems

476 community water systems serve Connecticut. 474 of them are listed below under 9 counties and on the pages of 187 cities and towns. Their own population figures add up to 2,753,022 people, a sum that counts people twice where one system sells water to another.

188 of them (39%) had at least one health-based violation in the last 10 years. 183 systems still have one unresolved.

397 rely mainly on groundwater and 79 on surface water, counting water bought from other systems.

464 systems filed a lead service line inventory listing 8,004 lead lines, 5,178 galvanized lines that must be replaced and 280,938 lines of unknown material.

13 systems are placed by mailing address or by the county their records name: EPA has no service area map for 9 of them, and 4 have one that does not line up with their own records.

2 systems have no county on record and are listed at the end of this page: EPA has no usable service area map for them, and their mailing address does not reliably place them in a county of Connecticut.

Community water systems
476
People served, sum of each system's own figure
2,753,022
Systems with a health-based violation, last 10 years
188
Systems with one unresolved
183
Lead service lines in inventories
8,004

Counties

9 counties

Each county counts the systems whose service area map reaches it. Systems placed only by a mailing address are listed on the county pages but not counted here.

County Systems People served With a health-based violation, 10 years With one unresolved
Capitol Planning Region 106 811,658 49 48
Greater Bridgeport Planning Region 3 361,888 0 0
Lower Connecticut River Valley Planning Region 59 114,804 24 23
Naugatuck Valley Planning Region 39 1,063,003 7 11
Northeastern Connecticut Planning Region 53 24,648 40 37
Northwest Hills Planning Region 44 62,049 9 10
South Central Connecticut Planning Region 11 551,096 3 3
Southeastern Connecticut Planning Region 80 228,786 32 24
Western Connecticut Planning Region 72 688,461 20 21

Largest systems

System Main county People served Main source Health-based violations, 10 years Unresolved Lead lines
Regional Water Authority South Central Connecticut Planning Region and 1 other county 418,900 Surface water 0 0 17
Metropolitan District Commission Capitol Planning Region 390,887 Surface water 0 0 0
Aquarion-Eastern Fairfield County Western Connecticut Planning Region and 2 other counties 351,756 Surface water 0 0 3,948
Aquarion-Stamford Western Connecticut Planning Region 119,214 Surface water 0 0 4
Waterbury Water Department Naugatuck Valley Planning Region 107,271 Surface water 0 1 952
CTWC - Northern Reg-Western System Capitol Planning Region 101,313 Surface water 0 1 34
New Britain Water Department Capitol Planning Region 73,534 Surface water 0 0 0
Danbury Water Department Western Connecticut Planning Region 62,055 Surface water 1 0 0
Meriden Water Division South Central Connecticut Planning Region 58,441 Surface water 1 0 0
Aquarion-Greenwich Naugatuck Valley Planning Region and 1 other county 53,297 Surface water 0 0 1,553
Bristol Water Department Naugatuck Valley Planning Region 52,079 Surface water 0 0 0
Manchester Water Department Capitol Planning Region 51,198 Surface water 0 0 5
Southington Water Department Capitol Planning Region 43,069 Surface water 0 0 0
South Norwalk Electric & Water Western Connecticut Planning Region 42,000 Surface water 3 0 19
Middletown Water Department Lower Connecticut River Valley Planning Region 41,019 Surface water 0 0 257

Systems with unresolved health-based violations

183 systems

The 100 with the most unresolved violations are listed. The county pages list the other 83.

System Main county People served Main source Health-based violations, 10 years Unresolved Lead lines
27 Maple Drive No county on record 38 Groundwater 0 16 0
Round Hill LLC - Well# 1&2 Northeastern Connecticut Planning Region 72 Groundwater 1 8 0
Village Market Place Northwest Hills Planning Region 462 Groundwater 2 7 0
Old Newgate Ridge Water Company Inc Capitol Planning Region 208 Groundwater 1 7 No inventory
Birch Groves Association, Inc Western Connecticut Planning Region 300 Groundwater 0 6 0
Evangelical Christian Center - Main Northeastern Connecticut Planning Region 84 Groundwater 2 6 0
Crestview Condominium Association Naugatuck Valley Planning Region 84 Groundwater 1 6 No inventory
Goodspeed Actor Housing - the Village Lower Connecticut River Valley Planning Region 40 Groundwater 2 6 0
Eldridge Elderly Housing Northwest Hills Planning Region 40 Groundwater 1 6 0
31 Grist Mill Rd Lower Connecticut River Valley Planning Region 30 Groundwater 6 5 0
Sunny Valley Tax District Western Connecticut Planning Region 500 Groundwater 5 4 0
Cornell Hills Assoc, Inc Western Connecticut Planning Region 108 Purchased surface water 1 4 0
Juniper Club Inc. Capitol Planning Region 104 Groundwater 7 4 0
Grant Hill Associates, Inc. Capitol Planning Region 97 Groundwater 1 4 0
890 Boston Turnpike Capitol Planning Region 60 Groundwater 2 4 0
Brookview Water Company Western Connecticut Planning Region 55 Groundwater 1 4 No inventory
Lyme Academy Apartments,LLC Lower Connecticut River Valley Planning Region 48 Groundwater 4 4 0
Sunset Apartments LLC Capitol Planning Region 46 Groundwater 3 4 0
Freedom Village Elderly Housing Southeastern Connecticut Planning Region 43 Groundwater 4 4 0
Fairfield Hills Western Connecticut Planning Region 2,610 Groundwater 1 3 0
Yeshiva of Waterbury-Durham Campus Lower Connecticut River Valley Planning Region 490 Groundwater 2 3 0
GQC Well Commission Capitol Planning Region 360 Groundwater 1 3 0
Colchester Estates Southeastern Connecticut Planning Region 276 Groundwater 1 3 0
Blue Trails Water Association South Central Connecticut Planning Region and 1 other county 228 Groundwater 2 3 0
Ivy Woods Capitol Planning Region 207 Groundwater 1 3 0
White Oak Condominiums Capitol Planning Region 192 Groundwater 1 3 0
Renwood Apartments Capitol Planning Region 190 Groundwater 5 3 0
Maplewood-Millbrook Apartments Capitol Planning Region 153 Groundwater 3 3 0
Chelsea Common Condominium Association Capitol Planning Region 126 Groundwater 1 3 0
Deer Park Apartments Capitol Planning Region 125 Groundwater 4 3 0
Club House Apartments Capitol Planning Region 115 Groundwater 1 3 0
Pinecrest Condominiums Northeastern Connecticut Planning Region 110 Groundwater 8 3 0
Lake Hills Village Condominiums Naugatuck Valley Planning Region 102 Groundwater 1 3 No inventory
Woodlawn Apartments Northeastern Connecticut Planning Region 96 Groundwater 2 3 No inventory
School Hill Association, Inc. Capitol Planning Region 77 Groundwater 1 3 0
Woodcreek Village Condominium Assn, Inc Western Connecticut Planning Region 72 Groundwater 1 3 No inventory
Essex Gardens Lower Connecticut River Valley Planning Region 72 Groundwater 1 3 0
Lakeside Manor Apartments Southeastern Connecticut Planning Region 72 Groundwater 2 3 0
Country Manor Northeastern Connecticut Planning Region 66 Groundwater 8 3 0
North Willington Village Condo Assoc. Capitol Planning Region 66 Groundwater 2 3 No inventory
Little Brook Rd Property Owners Assn Northwest Hills Planning Region 64 Groundwater 2 3 0
Conrads Park Northeastern Connecticut Planning Region 60 Groundwater 5 3 No inventory
Mile Creek Apartments Lower Connecticut River Valley Planning Region 60 Groundwater 1 3 0
Neighbors of Rogers, LLC Southeastern Connecticut Planning Region 57 Groundwater 1 3 0
Oakdale Manor Water Association Naugatuck Valley Planning Region 40 Groundwater 3 3 No inventory
Hebron Arms Apartments Capitol Planning Region 39 Groundwater 2 3 0
Ridgewood Hills Association System 1 Lower Connecticut River Valley Planning Region 36 Groundwater 1 3 0
Old Indian Trail Lower Connecticut River Valley Planning Region 32 Groundwater 1 3 0
Woodstock Housing Authority Northeastern Connecticut Planning Region 26 Groundwater 1 3 0
Salem Manor Condominiums, System #2 Southeastern Connecticut Planning Region 25 Groundwater 1 3 0
Durham Center Division Lower Connecticut River Valley Planning Region 1,601 Purchased surface water 0 2 0
Sharon Water & Sewer Commission Northwest Hills Planning Region 803 Surface water 1 2 No inventory
Woodstock Academy South Campus Northeastern Connecticut Planning Region 620 Groundwater 1 2 0
Edgemere Condominium Assn., Inc. Lower Connecticut River Valley Planning Region 540 Groundwater 0 2 0
Stone Bridge Center for Health & Rehab Western Connecticut Planning Region 504 Groundwater 1 2 0
Woodhaven Apartments Capitol Planning Region 489 Groundwater 1 2 0
Pomfret School Northeastern Connecticut Planning Region 400 Groundwater 1 2 0
Turkey Hill of East Granby, LLC Capitol Planning Region 360 Groundwater 1 2 0
Ethel Walker School Capitol Planning Region 325 Groundwater 1 2 0
Aquarion-Carmen Hill Western Connecticut Planning Region 322 Groundwater 0 2 0
Knollwood Apartments Capitol Planning Region 312 Groundwater 2 2 0
The Rectory School Northeastern Connecticut Planning Region 300 Groundwater 1 2 0
Chadwick Homeowners Assn., Inc. Lower Connecticut River Valley Planning Region 292 Groundwater 1 2 0
Walden Apartments Capitol Planning Region 276 Groundwater 1 2 0
Woodbury Knoll, LLC. Naugatuck Valley Planning Region 258 Groundwater 1 2 0
Matulaitis Nursing Home Northeastern Connecticut Planning Region 254 Groundwater 1 2 0
Johnson Memorial Hospital, Inc Capitol Planning Region 250 Groundwater 1 2 0
Apple Rehab No county on record 238 Purchased surface water 1 2 0
South Kent School Northwest Hills Planning Region 228 Groundwater 1 2 0
Colchester Commons Southeastern Connecticut Planning Region 224 Groundwater 2 2 0
Quinebaug Mobile Home Park Northeastern Connecticut Planning Region 205 Groundwater 6 2 0
Woodstock Meadows Condominium Assn. Northeastern Connecticut Planning Region 180 Groundwater 1 2 0
Orchard Acres Association Capitol Planning Region 176 Groundwater 5 2 0
Carefree Homeowners Association Southeastern Connecticut Planning Region 172 Groundwater 1 2 0
Marlborough Health Care Center, Inc Capitol Planning Region 165 Groundwater 1 2 0
Twin Hills Water District Capitol Planning Region 156 Groundwater 4 2 0
CTWC - Westchester East Lower Connecticut River Valley Planning Region 153 Groundwater 0 2 0
Campbell Heights Apartments Northeastern Connecticut Planning Region 152 Groundwater 3 2 0
Perry Hill Estates Apartments Inc. Northeastern Connecticut Planning Region 144 Groundwater 2 2 0
Ashford Hills Apartments Northeastern Connecticut Planning Region 136 Groundwater 2 2 0
Birch Hills Condominiums Northeastern Connecticut Planning Region 132 Groundwater 1 2 0
Lake Lillinonah Shores Condos Western Connecticut Planning Region 130 Groundwater 7 2 0
Cobalt Lodge Healthcare & Rehab Center Lower Connecticut River Valley Planning Region 130 Groundwater 1 2 0
Marianapolis Prep School - St Johns Northeastern Connecticut Planning Region 128 Groundwater 1 2 0
Bee Brook Crossing Condominiums Northwest Hills Planning Region 120 Groundwater 0 2 0
Heritage Hill Condominium Assn, Inc Naugatuck Valley Planning Region 120 Groundwater 1 2 0
Hunting Lodge Apartments Capitol Planning Region 115 Groundwater 1 2 0
Mountview Apartments Southeastern Connecticut Planning Region 105 Groundwater 7 2 0
Willington Ridge Condos - System #1 Capitol Planning Region 102 Groundwater 2 2 0
Willington Ridge Condos - System #2 Capitol Planning Region 102 Groundwater 1 2 0
Abby Water LLC Capitol Planning Region 100 Groundwater 2 2 0
Roseland Terrace Association, Inc. Northeastern Connecticut Planning Region 100 Groundwater 3 2 0
Griswold MHP LLC Southeastern Connecticut Planning Region 99 Groundwater 1 2 0
Fall Brook Mobile Home Park Northeastern Connecticut Planning Region 98 Groundwater 1 2 0
Hillside Condominiums Capitol Planning Region 96 Groundwater 1 2 0
Woods Edge Apartments Capitol Planning Region 96 Groundwater 1 2 0
Solano Inn LLC Lower Connecticut River Valley Planning Region 96 Groundwater 1 2 0
Ridgeview Heights Capitol Planning Region 96 Groundwater 2 2 0
East Windsor Housing Authority Capitol Planning Region 94 Groundwater 4 2 0
Thompson Hill Water Co - Paula Lane Div Northeastern Connecticut Planning Region 85 Groundwater 2 2 0

Systems with no county on record

2 systems

EPA lists no county for these systems, their IDs code none, they have no usable EPA service area map, and their mailing address does not reliably place them in a county of this state: it is in another state, matches no county, or is an office shared by many systems.

System People served Main source Health-based violations, 10 years Unresolved Lead lines
27 Maple Drive 38 Groundwater 0 16 0
Apple Rehab 238 Purchased surface water 1 2 0

Back to All states

Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations