U.S. water systems

Connecticut Water Systems

Connecticut

1,000 community water systems on record — 474 active, 526 inactive.

Every active community water system nationwide must produce a Consumer Confidence Report under the EPA's revised rule, effective for reports due July 1, 2027.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Connecticut’s official records. Always confirm current status with Connecticut before making decisions based on this information.

Counties in Connecticut

Fairfield County (139)Hartford County (101)Litchfield County (119)Middlesex County (80)New Haven County (96)New London County (187)Tolland County (136)Windham County (134)

All community water systems in Connecticut

System name	Mailing city	Population served	Status
REGIONAL WATER AUTHORITY	NEW HAVEN	418,900	Active
METROPOLITAN DISTRICT COMMISSION	HARTFORD	390,887	Active
AQUARION-EASTERN FAIRFIELD COUNTY	SHELTON	351,756	Active
AQUARION-STAMFORD	SHELTON	119,214	Active
WATERBURY WATER DEPARTMENT	WATERBURY	107,271	Active
CTWC - NORTHERN REG-WESTERN SYSTEM	CLINTON	101,313	Active
NEW BRITAIN WATER DEPARTMENT	NEW BRITAIN	73,534	Active
DANBURY WATER DEPARTMENT	DANBURY	62,055	Active
MANSFIELD	MANSFIELD	60,000	Inactive
MERIDEN WATER DIVISION	MERIDEN	58,441	Active
AQUARION-GREENWICH	SHELTON	53,297	Active
BRISTOL WATER DEPARTMENT	BRISTOL	52,079	Active
MANCHESTER WATER DEPARTMENT	MANCHESTER	51,198	Active
SOUTHINGTON WATER DEPARTMENT	SOUTHINGTON	43,069	Active
SOUTH NORWALK ELECTRIC & WATER	WILTON	42,000	Active
MIDDLETOWN WATER DEPARTMENT	MIDDLETOWN	41,019	Active
NORWALK FIRST TAXING DISTRICT	NORWALK	40,256	Active
TORRINGTON WATER COMPANY	SHELTON	37,915	Active
WALLINGFORD WATER DEPARTMENT	WALLINGFORD	37,267	Active
NORWICH PUBLIC UTILITIES	NORWICH	36,163	Active
CTWC - SHORELINE REGION-GUILFORD SYSTEM	CLINTON	33,975	Active
GROTON UTILITIES	GROTON	30,200	Active
REGIONAL WATER AUTHORITY-ANSONIA	NEW HAVEN	29,600	Inactive
NEW LONDON DEPT. OF PUBLIC UTILITIES	WATERFORD	27,620	Active
UNIVERSITY OF CONNECTICUT - MAIN CAMPUS	STORRS	27,199	Active
CTWC - NAUGATUCK REGION-CENTRAL SYSTEM	CLINTON	22,735	Active
WINDHAM WATER WORKS	MANSFIELD CENTER	21,214	Active
AQUARION-DARIEN	SHELTON	18,737	Active
HAZARDVILLE WATER COMPANY	ENFIELD	18,544	Active
AQUARION-PLAINVILLE REGIONAL	SHELTON	18,231	Active
MASHANTUCKET PEQUOT TRIBAL NATION	MASHANTUCKET	17,050	Inactive
WATERFORD WPCA	WATERFORD	16,578	Active
EAST LYME WATER & SEWER COMMISSION	NIANTIC	15,245	Active
CTWC - UNIONVILLE SYSTEM	CLINTON	14,693	Active
AQUARION-SIMSBURY REGIONAL	SHELTON	14,691	Active
CROMWELL FIRE DISTRICT WATER DEPARTMENT	CROMWELL	14,316	Active
AQUARION-NEW MILFORD REGIONAL	SHELTON	13,331	Active
AQUARION-VALLEY	SHELTON	13,080	Active
AVON WATER CO	CLINTON	11,590	Active
AQUARION-MYSTIC	SHELTON	10,788	Active
AQUARION-NEW CANAAN	SHELTON	10,097	Active
WATERTOWN WATER & SEWER AUTHORITY	OAKVILLE	9,972	Active
BETHEL WATER DEPT	BETHEL	9,507	Active
EAST LONGMEADOW WATER DEPARTMENT	—	9,000	Inactive
WINSTED WATER DEPT	WINCHESTER	8,954	Inactive
WINSTED WATER WORKS	WINSTED	7,784	Active
KENSINGTON FIRE DISTRICT	KENSINGTON	7,553	Active
AQUARION-RIDGEFIELD	SHELTON	7,476	Active
HERITAGE WATER COMPANY	CLINTON	7,300	Active
PUTNAM WATER POLLUTION CONTROL AUTHORITY	PUTNAM	7,300	Active
JEWETT CITY WATER COMPANY	ENFIELD	6,840	Active
WATERTOWN FIRE DISTRICT	WATERTOWN	6,718	Active
CTWC - CRYSTAL SYSTEM	CLINTON	6,378	Active
CTWC - NAUGATUCK REG-COLLINSVILLE SYS	CLINTON	6,324	Active
AQUARION-NEWTOWN REGIONAL	SHELTON	6,054	Active
CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM	CLINTON	5,607	Active
BERLIN WATER CONTROL COMMISSION	BERLIN	5,128	Active
CTWC - SHORELINE REGION-CHESTER SYSTEM	CLINTON	5,030	Active
PORTLAND WATER DEPARTMENT	PORTLAND	5,010	Active
LEDYARD WPCA, HIGHLANDS SYSTEM	LEDYARD	4,134	Inactive
COLCHESTER SEWER & WATER COMMISSION	COLCHESTER	4,020	Active
CTWC - NAUGATUCK REG-THOMASTON SYSTEM	CLINTON	3,789	Active
CTWC - SHORELINE REGION-SOUND VIEW	CLINTON	3,397	Active
LEDYARD WPCA - LEDYARD CENTER	LEDYARD	3,294	Active
AQUARION-LITCHFIELD REGIONAL	SHELTON	3,097	Active
CONNECTICUT VALLEY HOSPITAL	MIDDLETOWN	2,928	Active
WORTHINGTON FIRE DISTRICT	BERLIN	2,875	Active
TORRINGTON WATER SUPPLY, CITY OF	TORRINGTON	2,720	Inactive
FAIRFIELD HILLS	NEWTOWN	2,610	Active
SCWA, MONTVILLE DIVISION (MTV)	GALES FERRY	2,570	Active
SCWA, TOWER-FERRY VIEW DIVISION	GALES FERRY	2,567	Active
WOLCOTT WATER DEPARTMENT	WOLCOTT	2,550	Active
CTWC - GALLUP SYSTEM	CLINTON	2,538	Active
GROTON LONG POINT ASSOCIATION	GROTON	2,400	Active
CONNECTICUT CORRECTIONAL INSTITUTE	WETHERSFIELD	2,385	Active
LEDYARD WPCA, GALES FERRY SYSTEM	LEDYARD	2,369	Active
ELLINGTON ACRES COMPANY	EAST WINDSOR	2,342	Inactive
SALMON BROOK DISTRICT WATER DEPT	GRANBY	2,151	Active
NOANK FIRE DISTRICT	NOANK	1,947	Active
AQUARION-SALISBURY	SHELTON	1,932	Active
CTWC - HEBRON CENTER DIVISION	CLINTON	1,927	Active
AQUARION-NEW HARTFORD	SHELTON	1,872	Active
SCWA, NORTH STONINGTON DIVISION (NST)	GALES FERRY	1,860	Active
CTWC - PLAINFIELD SYSTEM	CLINTON	1,713	Active
MONTVILLE CORRECTIONAL COMPLEX	WETHERSFIELD	1,689	Inactive
DURHAM CENTER DIVISION	DURHAM	1,601	Active
LAKE HAYWARD	EAST HADDAM	1,600	Inactive
AQUARION-NORTH CANAAN	SHELTON	1,481	Active
TARIFFVILLE FIRE DISTRICT WATER DEPT	TARIFFVILLE	1,477	Active
SCWA, MOHEGAN DIVISION	GALES FERRY	1,428	Active
CTWC - LEGEND HILL SYSTEM	CLINTON	1,368	Active
AQUARION-MARLBOROUGH	SHELTON	1,348	Active
CTWC - NAUGATUCK DIV, TOWN OF MIDDLEBURY	CLINTON	1,332	Inactive
CANDLEWOOD SHORES TAX DISTRICT	BETHEL	1,315	Active
MONTVILLE WATER SUPPLY	UNCASVILLE	1,300	Active
TOLLAND WATER DEPARTMENT	TOLLAND	1,251	Active
AQUARION-WOODBURY	SHELTON	1,209	Active
AQUARION WATER CO OF CT-WESTERN BROOKFLD	BRIDGEPORT	1,203	Inactive
OLD LYME SHORES	OLD LYME	1,200	Inactive
AQUARION-EAST DERBY	SHELTON	1,101	Active
CTWC - THOMPSON SYSTEM	CLINTON	1,070	Active
CTWC - SHORELINE REGION-POINT O WOODS	CLINTON	1,068	Active
SPRAGUE WATER & SEWER AUTHORITY	BALTIC	1,058	Active
CTWC - NORTHERN REG-SOMERS SYSTEM	EAST WINDSOR	1,051	Inactive
UNIVERSITY OF CONNECTICUT - DEPOT CAMPUS	STORRS	1,010	Inactive
SOUND VIEW IMPROVEMENT CO	OLD LYME	1,000	Inactive
AQUARION-RIDGEFIELD KNOLLS	SHELTON	958	Active
SOUND VIEW IMPROVMENT CO	OLD LYME	940	Inactive
AQUARION-NORFOLK	SHELTON	913	Active
AQUARION WATER CO OF CT-GREENRIDGE	BRIDGEPORT	912	Inactive
WOODLAKE TAX DISTRICT	WOODBURY	912	Active
CTWC - AMSTON LAKE DIVISION	CLINTON	910	Active
LAKE AMSTON DIV BESECK LK WATE	HEBRON	908	Inactive
SCWA, OAKDALE HEIGHTS DIVISION	GALES FERRY	876	Active
AVERY HEIGHTS WATER ASSN INC	SOUTH WINDSOR	864	Inactive
AQUARION-KENT	SHELTON	817	Active
SOUTHBURY TRAINING SCHOOL	SOUTHBURY	816	Active
SHARON WATER & SEWER COMMISSION	SHARON	803	Active
TOWN OF SOMERS - SOMERSVILLE SYSTEM	SOMERS	800	Inactive
GAYLORD HOSPITAL	WALLINGFORD	755	Inactive
AQUARION WATER CO OF CT-RIDGEFIELD LAKES	BRIDGEPORT	750	Inactive
CTWC - JENSENS BEECHWOOD SYSTEM	CLINTON	750	Active
CTWC - UCONN SOUTH EAGLEVILLE DIV.	CLINTON	750	Active
CLC OWNERS CORPORATION	BROOKFIELD	736	Active
KENT SCHOOL CORP (VALLEY CAMPUS)	KENT	722	Active
CTWC - SPICE HILL DIVISION	CLINTON	712	Active
LAKE WAUBEEKA ASSOCIATION	DANBURY	712	Active
CTWC - COVENTRY HILLS DIV	CLINTON	700	Active
CTWC - NORTHERN REG-CRESCENT LAKE SYSTEM	CLINTON	680	Inactive
SCWA, LEDYARD CENTER DIVISION	GALES FERRY	652	Active
ROLLINGWOOD CONDOMINIUMS	SEYMOUR	646	Inactive
AQUARION-BALL POND	SHELTON	629	Active
WOODSTOCK ACADEMY SOUTH CAMPUS	WOODSTOCK	620	Active
LORD S POINT ASSN	STONINGTON	600	Inactive
WATERTOWN WATER & SEWER - WESTGATE	OAKVILLE	600	Active
AQUARION-SUFFIELD	SHELTON	595	Active
CANDLEWOOD KNOLLS COMMUNITY IN	NEW FAIRFIELD	568	Inactive
BRUNSWICK SCHOOL (LOWER & LOWER MIDDLE)	GREENWICH	567	Active
QUONNIPAUG HILLS - MAIN SYSTEM	BRANFORD	564	Active
AQUARION WATER CO OF CT-SO. BROOKFIELD	BRIDGEPORT	561	Inactive
PRESTON PLAINS WATER COMPANY	MASHANTUCKET	550	Active
EDGEMERE CONDOMINIUM ASSN., INC.	EAST HAMPTON	540	Active
CANDLEWOOD KNOLLS WATER AUTHORITY	NEW FAIRFIELD	524	Active
SCWA, CHESTERFIELD DIVISION	GALES FERRY	524	Active
SALISBURY SCHOOL	SALISBURY	520	Active
STONE BRIDGE CENTER FOR HEALTH & REHAB	NEWTOWN	504	Active
CTWC - SOUTH COVENTRY SYSTEM	CLINTON	501	Active
AVON OLD FARMS SCHOOL	AVON	500	Inactive
HAWKS NEST BEACH 3	OLD LYME	500	Inactive
KILLINGLY INDUSTRIAL PARK	DANIELSON	500	Inactive
LAKE BESECK DIV BESECK LK WATE	MIDDLEFIELD	500	Inactive
SUNNY VALLEY TAX DISTRICT	NEW MILFORD	500	Active
WHITE SANDS BEACH	OLD LYME	500	Inactive
KITEMAUG ORCHARD ASSOCIATION, INC.	UNCASVILLE	490	Active
YESHIVA OF WATERBURY-DURHAM CAMPUS	WATERBURY	490	Active
WOODHAVEN APARTMENTS	WILLINGTON	489	Active
AQUARION-FALLS VILLAGE	SHELTON	488	Active
ANNHURST COLLEGE	WOODSTOCK	475	Inactive
CTWC - NORTHERN REGION-LAKEVIEW TERRACE	CLINTON	472	Active
HARMONY ACRES MOBILE HOME PARK	PLAINVILLE	465	Active
VILLAGE MARKET PLACE	GOSHEN	462	Active
MIAMI BEACH WATER COMPANY	CLINTON	460	Inactive
AQUARION-LAKESIDE	SHELTON	455	Active
SCWA, HILLCREST DIVISION (HLC)	GALES FERRY	450	Active
AQUARION-OXFORD TOWNE CENTER	SHELTON	449	Active
CTWC - SHORELINE REGION-MASONS ISLAND	CLINTON	445	Active
CTWC - BAY MOUNTAIN	CLINTON	440	Active
VERNON VILLAGE INC.	VERNON	430	Active
STAFFORD HOLLOW WATER ASSOCIATION	STAFFORD	429	Active
CTWC - REDWOOD FARMS DIVISION	CLINTON	424	Active
OAKLAND HEIGHTS MOBILE HOME PARK	NORWICH	413	Inactive
AQUARION-NEW FAIRFIELD	SHELTON	406	Active
POMFRET SCHOOL	POMFRET	400	Active
VALLEY LAKE	SHERMAN	400	Inactive
RUMSEY HALL SCHOOL	WASHINGTON	398	Active
AQUARION-MEADOWBROOK	SHELTON	396	Active
AQUARION-ARLINGTON ACRES	SHELTON	392	Active
STONY HILL VILLAGE CONDOMINIUM ASSN	DANBURY	392	Active
AQUA VISTA ASSOC, INC	DANBURY	388	Active
SCWA, ROBIN HILL DIVISION (RBN)	GALES FERRY	388	Active
WEST HILL LAKE WATER ASSN	NEW HARTFORD	380	Inactive
SCWA, CEDAR RIDGE DIVISION	GALES FERRY	370	Active
COUNTRY HILLS	TOLLAND	368	Inactive
EAST HAMPTON WPCA - VILLAGE CENTER	EAST HAMPTON	366	Active
WOLCOTT VIEW MANOR	WOLCOTT	366	Inactive
GQC WELL COMMISSION	VERNON	360	Active
TURKEY HILL OF EAST GRANBY, LLC	EAST GRANBY	360	Active
KNOLLCREST TAX DISTRICT	NEW FAIRFIELD	356	Active
HAZARDVILLE - RYE HILL SYSTEM	ENFIELD	352	Active
CTWC - ASHFORD PARK DIVISION	CLINTON	334	Active
AQUARION-PLEASURE VALLEY	SHELTON	328	Active
EAST HAMPTON WPCA - ROYAL OAKS SYSTEM	EAST HAMPTON	328	Active
WILLINGTON SENIOR CENTER & HOUSING	WILLINGTON	327	Active
ETHEL WALKER SCHOOL	SIMSBURY	325	Active
AQUARION-CARMEN HILL	SHELTON	322	Active
JEWETT CITY WATER CO., S & W SYSTEM	ENFIELD	320	Active
SANDY LANE VILLAGE CONDO. ASSN., INC.	BETHEL	318	Inactive
CANDLEWOOD TRAILS ASSOCIATION, INC.	NEW MILFORD	312	Active
KNOLLWOOD APARTMENTS	STORRS	312	Active
WYNDHAM PARK APARTMENTS	WINDHAM	312	Active

Showing the 200 largest of 1,000 systems on record, by population served. Browse by county above for the full list — every system has its own page, and all of them are in the sitemap.