Tap WaterIndex State rankings

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Connecticut tap water quality

505 community water systems

Lead by system → PFAS by system →
6.6%
exceed lead action level
(33/499 systems)
58.7%
PFOA/PFOS detected
(37/63 systems)

Largest water systems

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 system.
SystemCityPopulationLead (p90)
REGIONAL WATER AUTHORITY ANSONIA 418,900 0.0000 mg/L
METROPOLITAN DISTRICT COMMISSION BERLIN 390,887 0.0068 mg/L
AQUARION-EASTERN FAIRFIELD COUNTY BEACON FALLS 351,756 0.0030 mg/L
AQUARION-STAMFORD DARIEN 119,214 0.0050 mg/L
WATERBURY WATER DEPARTMENT MIDDLEBURY 107,271 0.0060 mg/L
CTWC - NORTHERN REG-WESTERN SYSTEM EAST GRANBY 101,313 0.0050 mg/L
NEW BRITAIN WATER DEPARTMENT BERLIN 73,534 0.0059 mg/L
DANBURY WATER DEPARTMENT BETHEL 62,055 0.0044 mg/L
MERIDEN WATER DIVISION BERLIN 58,441 0.0010 mg/L
AQUARION-GREENWICH GREENWICH 53,297 0.0094 mg/L
BRISTOL WATER DEPARTMENT BRISTOL 52,079 0.0078 mg/L
MANCHESTER WATER DEPARTMENT GLASTONBURY 51,198 0.0047 mg/L
SOUTHINGTON WATER DEPARTMENT CHESHIRE 43,069 0.0039 mg/L
SOUTH NORWALK ELECTRIC & WATER DARIEN 42,000 0.0068 mg/L
MIDDLETOWN WATER DEPARTMENT CROMWELL 41,019 0.0007 mg/L
NORWALK FIRST TAXING DISTRICT NEW CANAAN 40,256 0.0088 mg/L
TORRINGTON WATER COMPANY HARWINTON 37,915 0.0028 mg/L
WALLINGFORD WATER DEPARTMENT NORTH HAVEN 37,267 0.0018 mg/L
NORWICH PUBLIC UTILITIES BOZRAH 36,163 0.0050 mg/L
AQUARION WATER/NH HAMPTON 34,000 0.0050 mg/L
CTWC - SHORELINE REGION-GUILFORD SYSTEM CLINTON 33,975 0.0032 mg/L
Mohegan Tribal Utility Authority 31,961 0.0046 mg/L
GROTON UTILITIES GROTON 30,200 0.0056 mg/L
NEW LONDON DEPT. OF PUBLIC UTILITIES NEW LONDON 27,620 0.0039 mg/L
UNIVERSITY OF CONNECTICUT - MAIN CAMPUS MANSFIELD 27,199 0.0113 mg/L
CTWC - NAUGATUCK REGION-CENTRAL SYSTEM BEACON FALLS 22,735 0.0036 mg/L
Mashantucket Pequot Water System 22,171 0.0040 mg/L
WINDHAM WATER WORKS MANSFIELD 21,214 0.0070 mg/L
AQUARION-DARIEN DARIEN 18,737 0.0058 mg/L
HAZARDVILLE WATER COMPANY EAST WINDSOR 18,544 0.0093 mg/L
AQUARION-PLAINVILLE REGIONAL BRISTOL 18,231 0.0060 mg/L
WATERFORD WPCA MONTVILLE 16,578 0.0074 mg/L
EAST LYME WATER & SEWER COMMISSION EAST LYME 15,245 0.0020 mg/L
CTWC - UNIONVILLE SYSTEM AVON 14,693 0.0140 mg/L
AQUARION-SIMSBURY REGIONAL EAST GRANBY 14,691 0.0066 mg/L
CROMWELL FIRE DISTRICT WATER DEPARTMENT BERLIN 14,316 0.0035 mg/L
AQUARION-NEW MILFORD REGIONAL BROOKFIELD 13,331 0.0050 mg/L
AQUARION-VALLEY ANSONIA 13,080 0.0074 mg/L
AVON WATER CO AVON 11,590 0.0047 mg/L
AQUARION-MYSTIC GROTON 10,788 0.0020 mg/L
AQUARION-NEW CANAAN NEW CANAAN 10,097 0.0109 mg/L
WATERTOWN WATER & SEWER AUTHORITY MIDDLEBURY 9,972 0.0050 mg/L
BETHEL WATER DEPT BETHEL 9,507 0.0020 mg/L
WINSTED WATER WORKS BARKHAMSTED 7,784 0.0042 mg/L
KENSINGTON FIRE DISTRICT BERLIN 7,553 0.0128 mg/L
AQUARION-RIDGEFIELD RIDGEFIELD 7,476 0.0130 mg/L
HERITAGE WATER COMPANY MIDDLEBURY 7,300 0.0064 mg/L
PUTNAM WATER POLLUTION CONTROL AUTHORITY PUTNAM 7,300 0.0037 mg/L
JEWETT CITY WATER COMPANY GRISWOLD 6,840 0.0016 mg/L
WATERTOWN FIRE DISTRICT WATERTOWN 6,718 0.0104 mg/L
CTWC - CRYSTAL SYSTEM BROOKLYN 6,378 0.0036 mg/L
CTWC - NAUGATUCK REG-COLLINSVILLE SYS AVON 6,324 0.0026 mg/L
AQUARION-NEWTOWN REGIONAL NEWTOWN 6,054 0.0120 mg/L
CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM PLYMOUTH 5,607 0.0047 mg/L
BERLIN WATER CONTROL COMMISSION BERLIN 5,128 0.0053 mg/L
CTWC - SHORELINE REGION-CHESTER SYSTEM CHESTER 5,030 0.0025 mg/L
PORTLAND WATER DEPARTMENT MIDDLETOWN 5,010 0.0079 mg/L
COLCHESTER SEWER & WATER COMMISSION COLCHESTER 4,020 0.0030 mg/L
CTWC - NAUGATUCK REG-THOMASTON SYSTEM PLYMOUTH 3,789 0.0038 mg/L
CTWC - SHORELINE REGION-SOUND VIEW OLD LYME 3,397 0.0027 mg/L
LEDYARD WPCA - LEDYARD CENTER LEDYARD 3,294 0.0079 mg/L
AQUARION-LITCHFIELD REGIONAL GOSHEN 3,097 0.0090 mg/L
CONNECTICUT VALLEY HOSPITAL MIDDLETOWN 2,928 0.0030 mg/L
WORTHINGTON FIRE DISTRICT BERLIN 2,875 0.0110 mg/L
FAIRFIELD HILLS NEWTOWN 2,610 0.0060 mg/L
SCWA, MONTVILLE DIVISION (MTV) MONTVILLE 2,570 0.0057 mg/L
SCWA, TOWER-FERRY VIEW DIVISION LEDYARD 2,567 0.0053 mg/L
WOLCOTT WATER DEPARTMENT WATERBURY 2,550 0.0021 mg/L
CTWC - GALLUP SYSTEM PLAINFIELD 2,538 0.0112 mg/L
GROTON LONG POINT ASSOCIATION GROTON 2,400 0.0068 mg/L
CONNECTICUT CORRECTIONAL INSTITUTE ENFIELD 2,385 0.0022 mg/L
LEDYARD WPCA, GALES FERRY SYSTEM GROTON 2,369 0.0053 mg/L
SALMON BROOK DISTRICT WATER DEPT GRANBY 2,151 0.0000 mg/L
NOANK FIRE DISTRICT GROTON 1,947 0.0044 mg/L
AQUARION-SALISBURY SALISBURY 1,932 0.0020 mg/L
CTWC - HEBRON CENTER DIVISION HEBRON 1,927 0.0023 mg/L
AQUARION-NEW HARTFORD NEW HARTFORD 1,872 0.0100 mg/L
SCWA, NORTH STONINGTON DIVISION (NST) NORTH STONINGTON 1,860 0.0068 mg/L
CTWC - PLAINFIELD SYSTEM BROOKLYN 1,713 0.0040 mg/L
DURHAM CENTER DIVISION DURHAM 1,601 0.0120 mg/L
AQUARION-NORTH CANAAN NORTH CANAAN 1,481 0.0030 mg/L
TARIFFVILLE FIRE DISTRICT WATER DEPT SIMSBURY 1,477 0.0016 mg/L
SCWA, MOHEGAN DIVISION MONTVILLE 1,428 0.0065 mg/L
CTWC - LEGEND HILL SYSTEM MADISON 1,368 0.0060 mg/L
AQUARION-MARLBOROUGH MARLBOROUGH 1,348 0.0070 mg/L
CANDLEWOOD SHORES TAX DISTRICT BROOKFIELD 1,315 0.0070 mg/L
MONTVILLE WATER SUPPLY MONTVILLE 1,300 0.0038 mg/L
TOLLAND WATER DEPARTMENT TOLLAND 1,251 0.0066 mg/L
AQUARION-WOODBURY WOODBURY 1,209 0.0020 mg/L
AQUARION-EAST DERBY DERBY 1,101 0.0011 mg/L
CTWC - THOMPSON SYSTEM THOMPSON 1,070 0.0038 mg/L
CTWC - SHORELINE REGION-POINT O WOODS OLD LYME 1,068 0.0067 mg/L
SPRAGUE WATER & SEWER AUTHORITY SPRAGUE 1,058 0.0052 mg/L
ROSEBROOK WATER CARROLL 1,050 0.1752 mg/L
AQUARION WATER COMPANY SHEFFIELD 987 0.0057 mg/L
AQUARION-RIDGEFIELD KNOLLS RIDGEFIELD 958 0.0285 mg/L
AQUARION-NORFOLK NORFOLK 913 0.0000 mg/L
WOODLAKE TAX DISTRICT WOODBURY 912 0.0079 mg/L
CTWC - AMSTON LAKE DIVISION COLCHESTER 910 0.0030 mg/L
SCWA, OAKDALE HEIGHTS DIVISION MONTVILLE 876 0.0104 mg/L