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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
76–100 of 121Ctwc - Plainfield System
CT1090081 · 1,713 served
Durham Center Division
CT0380021 · 1,601 served
Aquarion-north Canaan
CT1000011 · 1,481 served
Tariffville Fire District Water Dept
CT1280011 · 1,477 served
Scwa, Mohegan Division
CT0860021 · 1,428 served
Ctwc - Legend Hill System
CT0765101 · 1,368 served
Aquarion-marlborough
CT0798013 · 1,348 served
Candlewood Shores Tax District
CT0180061 · 1,315 served
Montville Water Supply
CT0864011 · 1,300 served
Tolland Water Department
CT1423011 · 1,251 served
Aquarion-woodbury
CT1680011 · 1,209 served
Aquarion-east Derby
CT0378011 · 1,101 served
Ctwc - Thompson System
CT1410011 · 1,070 served
Ctwc - Shoreline Region-point O Woods
CT1050752 · 1,068 served
Sprague Water & Sewer Authority
CT1330021 · 1,058 served
Aquarion-ridgefield Knolls
CT1180021 · 958 served
Aquarion-norfolk
CT0980011 · 913 served
Woodlake Tax District
CT1680031 · 912 served
Ctwc - Amston Lake Division
CT0670331 · 910 served
Scwa, Oakdale Heights Division
CT0860031 · 876 served
Aquarion-kent
CT0680011 · 817 served
Southbury Training School
CT1300011 · 816 served
Sharon Water & Sewer Commission
CT1250011 · 803 served
Ctwc - Uconn South Eagleville Div.
CT0787111 · 750 served
Ctwc - Jensens Beechwood System
CT0700011 · 750 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.
Connecticut Water FAQs
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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