EPA EXPORT · 13 SEP 2026FEDERAL COMPLIANCE RECORDS · NOT A HOME WATER TEST
TAP WATERLEDGERPublic system compliance records

STATE / TERRITORY LEDGER

Connecticut drinking water system records

EPA compliance fields for active community water systems reporting at least 2,500 people served.

Systems68active CWS · pop. 2,500+
Population served2,670,846reported total; may overlap
Current violation flag14.7%10 systems
Serious-violator flag1.5%1 systems

01 / LARGEST SYSTEMS

Community water systems in Connecticut

Population served is a system-reported service figure. It is not a count of unique state residents.

Water systemPopulation servedPrimary sourceCurrent export status
Regional Water AuthorityCT0930011418,900Surface waterNo current violation flagged
Metropolitan District CommissionCT0640011390,887Surface waterNo current violation flagged
Aquarion-Eastern Fairfield CountyCT0150011351,756Surface waterNo current violation flagged
Aquarion-StamfordCT1350011119,214Surface waterNo current violation flagged
Waterbury Water DepartmentCT1510011107,271Surface waterNo current violation flagged
Ctwc - Northern Reg-Western SystemCT0473011101,313Surface waterOther current violation flag
New Britain Water DepartmentCT089001173,534Surface waterNo current violation flagged
Danbury Water DepartmentCT034001162,055Surface waterNo current violation flagged
Meriden Water DivisionCT080001158,441Surface waterNo current violation flagged
Aquarion-GreenwichCT057001153,297Surface waterNo current violation flagged
Bristol Water DepartmentCT017001152,079Surface waterNo current violation flagged
Manchester Water DepartmentCT077002151,198Surface waterNo current violation flagged
Southington Water DepartmentCT131001143,069Surface waterNo current violation flagged
South Norwalk Electric & WaterCT103002142,000Surface waterNo current violation flagged
Middletown Water DepartmentCT083001141,019Surface waterNo current violation flagged
Norwalk First Taxing DistrictCT103001140,256Surface waterNo current violation flagged
Torrington Water CompanyCT143001137,915Surface waterNo current violation flagged
Wallingford Water DepartmentCT148001137,267Surface waterNo current violation flagged
Norwich Public UtilitiesCT104001136,163Surface waterNo current violation flagged
Ctwc - Shoreline Region-Guilford SystemCT060801133,975Surface waterNo current violation flagged
Mohegan Tribal Utility Authority01010900531,961Surface water purchasedNo current violation flagged
Groton UtilitiesCT059001130,200Surface waterNo current violation flagged
New London Dept. Of Public UtilitiesCT095001127,620Surface waterNo current violation flagged
University Of Connecticut - Main CampusCT078002127,199Surface water purchasedNo current violation flagged
Ctwc - Naugatuck Region-Central SystemCT088001122,735Surface waterNo current violation flagged
Mashantucket Pequot Water System01010600122,171Groundwater under influence of surface waterNo current violation flagged
Windham Water WorksCT163001121,214Surface waterNo current violation flagged
Aquarion-DarienCT035001118,737Surface water purchasedNo current violation flagged
Hazardville Water CompanyCT049002118,544Ground waterNo current violation flagged
Aquarion-Plainville RegionalCT110001118,231Ground waterCurrent serious-violator flag
Waterford WpcaCT152007116,578Surface water purchasedOther current violation flag
East Lyme Water & Sewer CommissionCT045001115,245Surface water purchasedNo current violation flagged
Ctwc - Unionville SystemCT052001114,693Surface water purchasedNo current violation flagged
Aquarion-Simsbury RegionalCT128002114,691Ground waterNo current violation flagged
Cromwell Fire District Water DepartmentCT033001114,316Ground waterNo current violation flagged
Aquarion-New Milford RegionalCT096001113,331Ground waterNo current violation flagged
Aquarion-ValleyCT124001113,080Surface water purchasedNo current violation flagged
Avon Water CoCT004001111,590Ground waterCurrent monitoring/reporting flag
Aquarion-MysticCT137001110,788Surface waterNo current violation flagged
Aquarion-New CanaanCT090001110,097Surface water purchasedNo current violation flagged
Watertown Water & Sewer AuthorityCT15300219,972Surface water purchasedNo current violation flagged
Bethel Water DeptCT00900119,507Surface waterNo current violation flagged
Winsted Water WorksCT16200117,784Surface waterNo current violation flagged
Kensington Fire DistrictCT00700117,553Surface water purchasedNo current violation flagged
Aquarion-RidgefieldCT11800117,476Surface water purchasedNo current violation flagged
Heritage Water CompanyCT13000217,300Surface water purchasedNo current violation flagged
Putnam Water Pollution Control AuthorityCT11600117,300Surface waterNo current violation flagged
Jewett City Water CompanyCT05800116,840Surface waterNo current violation flagged
Watertown Fire DistrictCT15300116,718Ground waterCurrent monitoring/reporting flag
Ctwc - Crystal SystemCT06900116,378Ground waterNo current violation flagged
Ctwc - Naugatuck Reg-Collinsville SysCT02300116,324Surface waterNo current violation flagged
Aquarion-Newtown RegionalCT09700116,054Ground waterOther current violation flag
Ctwc - Naugatuck Reg-Terryville SystemCT11100115,607Ground waterNo current violation flagged
Berlin Water Control CommissionCT00700215,128Surface water purchasedCurrent health-based flag
Ctwc - Shoreline Region-Chester SystemCT02610315,030Surface waterNo current violation flagged
Portland Water DepartmentCT11300115,010Surface water purchasedNo current violation flagged
Colchester Sewer & Water CommissionCT02800114,020Ground waterNo current violation flagged
Ctwc - Naugatuck Reg-Thomaston SystemCT14000113,789Ground waterNo current violation flagged
Ctwc - Shoreline Region-Sound ViewCT10507323,397Ground waterNo current violation flagged
Ledyard Wpca - Ledyard CenterCT07270913,294Surface water purchasedOther current violation flag
Aquarion-Litchfield RegionalCT07400113,097Surface water purchasedNo current violation flagged
Connecticut Valley HospitalCT08300212,928Surface waterNo current violation flagged
Worthington Fire DistrictCT00700312,875Surface water purchasedNo current violation flagged
Fairfield HillsCT09700212,610Ground waterCurrent health-based flag
Scwa, Montville Division (Mtv)CT08600112,570Ground waterNo current violation flagged
Scwa, Tower-Ferry View DivisionCT07200412,567Ground waterOther current violation flag
Wolcott Water DepartmentCT16614232,550Surface water purchasedNo current violation flagged
Ctwc - Gallup SystemCT10900312,538Ground waterNo current violation flagged

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