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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
26–50 of 121Aquarion-darien
CT0350011 · 18,737 served
Hazardville Water Company
CT0490021 · 18,544 served
Aquarion-plainville Regional
CT1100011 · 18,231 served
Waterford Wpca
CT1520071 · 16,578 served
East Lyme Water & Sewer Commission
CT0450011 · 15,245 served
Ctwc - Unionville System
CT0520011 · 14,693 served
Aquarion-simsbury Regional
CT1280021 · 14,691 served
Cromwell Fire District Water Department
CT0330011 · 14,316 served
Aquarion-new Milford Regional
CT0960011 · 13,331 served
Aquarion-valley
CT1240011 · 13,080 served
Avon Water Co
CT0040011 · 11,590 served
Aquarion-mystic
CT1370011 · 10,788 served
Aquarion-new Canaan
CT0900011 · 10,097 served
Watertown Water & Sewer Authority
CT1530021 · 9,972 served
Bethel Water Dept
CT0090011 · 9,507 served
Winsted Water Works
CT1620011 · 7,784 served
Kensington Fire District
CT0070011 · 7,553 served
Aquarion-ridgefield
CT1180011 · 7,476 served
Putnam Water Pollution Control Authority
CT1160011 · 7,300 served
Heritage Water Company
CT1300021 · 7,300 served
Jewett City Water Company
CT0580011 · 6,840 served
Watertown Fire District
CT1530011 · 6,718 served
Ctwc - Crystal System
CT0690011 · 6,378 served
Ctwc - Naugatuck Reg-collinsville Sys
CT0230011 · 6,324 served
Aquarion-newtown Regional
CT0970011 · 6,054 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
Quick Links
Data source: Utility data from EPA SDWIS. 121 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-22