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State utility hub
Browse the indexed community water systems in this state. Each profile brings the provider’s payment routes and household protection policies into a single, practical guide.
Private Investor-Owned Utility
Service area: 60 Connecticut towns, including the Connecticut Water Division, Crystal, Mansfield, Unionville, Storrs, Middlebury, Heritage Village, and other local divisions
Population: More than 107,000 water customers in 60 Connecticut towns, representing approximately 360,000 people; the company also reports about 3,000 wastewater customers in Southbury.
Public Water Authority
Service area: South-central Connecticut, including New Haven and member communities
Population: 418,900 people (EPA SDWIS PWS ID CT0930011; 2026 active CWS record; EPA name: REGIONAL WATER AUTHORITY).
Public Water Authority
Service area: Greater Hartford region and MDC member towns
Population: 390,887 people (EPA SDWIS PWS ID CT0640011; 2026 active CWS record).
Public Water Authority
Service area: Statewide Connecticut service territories formerly operated by Aquarion Water Company
Population: 351,756 people (EPA SDWIS PWS record; 2026 active CWS queue entry associated with the Aquarion system).
Private Investor-Owned Utility
Service area: Eastern Fairfield County
Population: 351,756 people (EPA SDWIS active CWS PWS CT0150011)
Private Investor-Owned Utility
Service area: Stamford, Connecticut, including the Aquarion Stamford division
Population: 119,214
Municipal Department
Service area: Waterbury, Watertown, Prospect and Wolcott service area
Population: 107,271
Private Investor-Owned Utility
Service area: Northern Region-Western System service territory
Population: 101,313
Municipal Department
Service area: New Britain and portions of Farmington, Newington, and Plainville
Population: Approximately 73,534 people in the EPA-listed New Britain community-water-system service area; the City reports more than 17,500 water accounts.
Municipal Department
Service area: City of Danbury
Population: 62,055 people (EPA SDWA queue estimate for CT0340011)
Municipal Department
Service area: City of Meriden
Population: 58,441 people (EPA SDWA queue estimate for CT0800011)
Private Investor-Owned Utility
Service area: Greenwich
Population: 53,297 people (EPA SDWA queue estimate for CT0570011)
Municipal Department
Service area: City of Bristol
Population: 52,079 people (EPA SDWA queue estimate for CT0170011)
Municipal Department
Service area: Town of Manchester
Population: 51,198 people (EPA SDWA queue estimate for CT0770021)
Private Investor-Owned Utility
Service area: Guilford and Connecticut Water Shoreline Region
Population: 33,975 people (EPA SDWA queue estimate for CT0608011)
Public Water Authority
Service area: Mohegan Tribal Utility Authority service area
Population: 31,961 people (EPA SDWA queue estimate for system 010109005)
Municipal Department
Service area: Groton and Ledyard
Population: 30,200 people (EPA SDWA queue estimate for CT0590011)
Public Water Authority
Service area: Ansonia, Derby, Orange, Seymour, and Woodbridge
Population: 29,600 people (EPA SDWA queue estimate for CT0020021)
Municipal Department
Service area: Storrs / University of Connecticut Main Campus
Population: 27,199 people (EPA SDWIS 2026Q2 estimate for CT0780021)
Private Investor-Owned Utility
Service area: Naugatuck
Population: 22,735 people (EPA SDWIS 2026Q2 estimate for CT0880011)
Public Water Authority
Service area: Mashantucket
Population: 22,171 people (EPA SDWIS 2026Q2 estimate for 010106001)
Public Water Authority
Service area: Windham / Mansfield Center
Population: 21,214 people (EPA SDWIS 2026Q2 estimate for CT1630011)
Private Investor-Owned Utility
Service area: Darien
Population: 18,737 people (EPA SDWIS 2026Q2 estimate for CT0350011)
Private Investor-Owned Utility
Service area: Enfield
Population: 18,544 people (EPA SDWIS 2026Q2 estimate for CT0490021)
Private Investor-Owned Utility
Service area: Plainville
Population: 18,231 people (EPA SDWIS 2026Q2 estimate for CT1100011)
Private Investor-Owned Utility
Service area: SHELTON
Population: 119214 people (EPA SDWIS 2026Q2 active CWS estimate for CT1350011)
Municipal Department
Service area: Waterbury, Watertown, Prospect, and Wolcott
Population: Approximately 107,271 people in the SDWIS system estimate; Waterbury Water states that its regional system serves more than 125,000 people and 26,000 service connections across Waterbury, Watertown, Prospect, and Wolcott.
Private Investor-Owned Utility
Service area: CLINTON
Population: 101313 people (EPA SDWIS 2026Q2 active CWS estimate for CT0473011)
Municipal Department
Service area: SOUTHINGTON
Population: 43069 people (EPA SDWIS 2026Q2 active CWS estimate for CT1310011)
Municipal Department
Service area: WILTON
Population: 42000 people (EPA SDWIS 2026Q2 active CWS estimate for CT1030021)
Municipal Department
Service area: NORWALK
Population: 40256 people (EPA SDWIS 2026Q2 active CWS estimate for CT1030011)
Private Investor-Owned Utility
Service area: SHELTON
Population: 37915 people (EPA SDWIS 2026Q2 active CWS estimate for CT1430011)
Municipal Department
Service area: WALLINGFORD
Population: 37267 people (EPA SDWIS 2026Q2 active CWS estimate for CT1480011)
Connecticut directory notes
This state hub brings together 33 indexed community water systems, from city departments and public authorities to investor-owned systems and smaller regional providers. A service area may cross municipal boundaries, so use the provider name and service address on your bill when choosing a profile.
The most important distinction is between a directory listing and an official account channel. Water Ledger provides a structured starting point; the utility’s own payment portal, published rate schedule, customer-service office, and mailed notice control your account. Compare the payment route, billing frequency, emergency number, and customer-protection notes before relying on a page for a time-sensitive decision.
If you are helping a household with a high bill, leak, or delinquency notice, open the utility profile and review the payment, shut-off, and leak-adjustment guides together. Keep the bill, account number, confirmation receipts, repair records, and notice dates available when speaking with the provider.