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Connecticut Water Quality
121
Utilities in database
2.7M
Residents served
22%
On private wells
2
Key contaminants tracked
Drinking Water in Connecticut
Connecticut has 121 community water systems serving approximately 2.7 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, lead. 22% of Connecticut residents rely on private wells. DPH holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Connecticut
101–121 of 121Clc Owners Corporation
CT0960071 · 736 served
Kent School Corp (valley Campus)
CT0680021 · 722 served
Lake Waubeeka Association
CT0340171 · 712 served
Ctwc - Spice Hill Division
CT0428031 · 712 served
Ctwc - Coventry Hills Div
CT0320091 · 700 served
Scwa, Ledyard Center Division
CT0720313 · 652 served
Aquarion-ball Pond
CT0910011 · 629 served
Woodstock Academy South Campus
CT1691171 · 620 served
Watertown Water & Sewer - Westgate
CT1539031 · 600 served
Aquarion-suffield
CT1390021 · 595 served
Brunswick School (lower & Lower Middle)
CT0579143 · 567 served
Quonnipaug Hills - Main System
CT0600041 · 564 served
Preston Plains Water Company
CT1140011 · 550 served
Edgemere Condominium Assn., Inc.
CT0420021 · 540 served
Ctwc - Northern Region-lakewood
CT0320011 · 532 served
Candlewood Knolls Water Authority
CT0910591 · 524 served
Scwa, Chesterfield Division
CT0860081 · 524 served
Salisbury School
CT1220061 · 520 served
Stone Bridge Center for Health & Rehab
CT0971011 · 504 served
Ctwc - South Coventry System
CT0320051 · 501 served
Sunny Valley Tax District
CT0960031 · 500 served
Key Contaminant Concerns in Connecticut
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
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Data source: Utility data from EPA SDWIS. 121 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-22