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EWG's Tap Water Database — 2021 UPDATE

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Largest utilities by state:

Utility name City People served
Aquarion Water Company of Connecticut - Canaan Sys Bridgeport Population served: 10,097
Aquarion Water Company of Connecticut - Greenwich System Bridgeport Population served: 53,041
Aquarion Water Company of Connecticut - Main System Bridgeport Population served: 351,756
Aquarion Water Company of Connecticut - Mystic Bridgeport Population served: 10,784
Aquarion Water Company of Connecticut - Noroton System Bridgeport Population served: 18,737
Aquarion Water Company of Connecticut - Simsbury System Bridgeport Population served: 14,679
Aquarion Water Company of Connecticut - Stamford Bridgeport Population served: 99,415
Aquarion Water Company of Connecticut - Valley System Bridgeport Population served: 13,080
Avon Water Company Clinton Population served: 11,590
Bristol Water Department Bristol Population served: 52,079
Connecticut Water Company - Northern Region-Western System Clinton Population served: 98,390
Cromwell Fire District Water Department Cromwell Population served: 14,316
CTWC - Naugatuck Region-Central System Clinton Population served: 22,108
CTWC - Shoreline Region-Guilford System Clinton Population served: 33,197
CTWC - Unionville System Clinton Population served: 14,693
Danbury Water Department Danbury Population served: 62,055
East Lyme Water & Sewer Commission Niantic Population served: 15,245
Groton Utilities Groton Population served: 30,200
Hazardville Water Company Enfield Population served: 18,544
Manchester Water Department Manchester Population served: 51,066
Meriden Water Division Meriden Population served: 58,441
Metropolitan District Commission Hartford Population served: 390,887
Middletown Water Department Middletown Population served: 41,019
New Britain Water Department New Britain Population served: 73,534
New London Department of Public Utilities New London Population served: 26,273
Norwalk First Taxing District Norwalk Population served: 40,256
Norwich Public Utilities Norwich Population served: 36,067
Regional Water Authority New Haven Population served: 418,900
South Norwalk Electric and Water Wilton Population served: 42,000
Southington Water Department Southington Population served: 43,069
Torrington Water Company Torrington Population served: 37,915
University of Connecticut - Main Campus Storrs Population served: 27,199
Valley Water Systems, Inc. Plainville Population served: 18,231
Wallingford Water Department Wallingford Population served: 37,267
Waterbury Water Department Waterbury Population served: 107,271
Waterford WPCA Waterford Population served: 16,578
Windham Water Works Mansfield Center Population served: 21,214
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