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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
51–75 of 121Ctwc - Naugatuck Reg-terryville System
CT1110011 · 5,607 served
Berlin Water Control Commission
CT0070021 · 5,128 served
Ctwc - Shoreline Region-chester System
CT0261031 · 5,030 served
Portland Water Department
CT1130011 · 5,010 served
Colchester Sewer & Water Commission
CT0280011 · 4,020 served
Ctwc - Naugatuck Reg-thomaston System
CT1400011 · 3,789 served
Ledyard Wpca - Ledyard Center
CT0727091 · 3,294 served
Aquarion-litchfield Regional
CT0740011 · 3,097 served
Ctwc - Shoreline Region-sound View
CT1050732 · 3,028 served
Connecticut Valley Hospital
CT0830021 · 2,928 served
Worthington Fire District
CT0070031 · 2,875 served
Fairfield Hills
CT0970021 · 2,610 served
Scwa, Montville Division (mtv)
CT0860011 · 2,570 served
Scwa, Tower-ferry View Division
CT0720041 · 2,567 served
Wolcott Water Department
CT1661423 · 2,550 served
Ctwc - Gallup System
CT1090031 · 2,538 served
Groton Long Point Association
CT0590051 · 2,400 served
Connecticut Correctional Institute
CT0490031 · 2,385 served
Ledyard Wpca, Gales Ferry System
CT0727051 · 2,369 served
Salmon Brook District Water Dept
CT0560011 · 2,151 served
Noank Fire District
CT0590031 · 1,947 served
Aquarion-salisbury
CT1220011 · 1,932 served
Ctwc - Hebron Center Division
CT0672031 · 1,927 served
Aquarion-new Hartford
CT0920011 · 1,872 served
Scwa, North Stonington Division (nst)
CT1020021 · 1,860 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