State Hub
Connecticut Water Quality
121
Utilities in database
2.7M
Residents served
0
With open violations
59
PFAS monitored
Quick Answer
Connecticut public drinking water is served by 121 EPA-tracked water systems, providing service to approximately 2.7 million residents through public utilities. No open health-based violations are currently recorded across tracked systems in the EPA federal database. 59 systems have official PFAS monitoring records from the EPA UCMR 5 program (2023–2025). About 22% of CT residents use private wells, which fall outside federal utility compliance monitoring.
No open health-based violations are currently recorded in the EPA SDWIS database for Connecticut's tracked water systems. Always verify with your utility's Consumer Confidence Report for annual test results.
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.
Safest Large Utilities
Connecticut systems with no open health violations serving 10,000+ residents.
Regional Water Authority
Connecticut · 418,900
Metropolitan District Commission
Berlin,Bloomfield,Cromwell,East Granby,East Hartford,Farmington,Glastonbury,Hartford,Manchester,Newington,Portland,Rocky Hill,South Windsor,West Hartford,Wethersfield,Windsor,Windsor Locks · 390,887
Aquarion-eastern Fairfield County
Beacon Falls,Bridgeport,Darien,Easton,Fairfield,Greenwich,Monroe,New Canaan,Newtown,Norwalk,Redding,Ridgefield,Seymour,Shelton,Stamford,Stratford,Trumbull,Weston,Westport,Wilton · 351,756
Aquarion-stamford
Connecticut · 119,214
Waterbury Water Department
Connecticut · 107,271
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
These contaminants appear most frequently in Connecticut utility records or pose elevated risk in this region based on EPA data.
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. Critically, a utility's water quality report can show zero detected lead at the treatment plant while your specific tap still delivers elevated lead — because the contamination happens inside the distribution system and your home's plumbing, not at the source.
EPA limit: 15 ppb (action level)
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.
EPA limit: 80 µg/L (TTHMs) / 60 µg/L (HAA5)
City Water Reports in Connecticut
Tap water quality pages for Connecticut cities — violations, PFAS records, utility profiles, and official source links.
Independent Water Testing
Find a certified lab in Connecticut
Utility compliance records show what water systems report to the EPA. An independent test from a certified laboratory confirms what's actually in your tap water. Connecticut labs can test for PFAS, lead, nitrates, bacteria, and dozens of other contaminants.
Explore Water Quality in Connecticut
Aquarion-darien
Violation history, PFAS records, and official source links
Hazardville Water Company
Violation history, PFAS records, and official source links
Aquarion-plainville Regional
Violation history, PFAS records, and official source links
PFAS monitoring records — Connecticut
59 water systems in Connecticut with EPA UCMR 5 records
Lead in Connecticut drinking water
State-specific lead data, violation utilities, and testing guidance
PFAS in Connecticut drinking water
State-specific PFAS data, MCL context, and treatment options
Certified water testing labs in Connecticut
Labs certified for PFAS (EPA 533/537.1), lead, and bacteria testing
Water treatment options
Reverse osmosis, activated carbon, and filtration guides with cost ranges
Data sources and methodology
How WaterUtilityReport.com sources and validates official EPA data
Common Questions About Connecticut Drinking Water
Does Connecticut drinking water have PFAS?
59 Connecticut water systems have EPA UCMR 5 PFAS monitoring records (2023–2025)
Which Connecticut water utilities have open violations?
Browse Connecticut utility compliance records and violation history
How do I test my water in Connecticut?
State-certified labs for PFAS (EPA 533/537.1), lead, nitrate, and bacteria testing
What treatment removes PFAS from CT tap water?
Reverse osmosis removes PFAS, lead, arsenic, and nitrates — cost, maintenance, and NSF certification explained
What do Connecticut PFAS records tell me about my water?
EPA limits, health context, and what UCMR 5 detection above MRL means for your water
How is Connecticut water quality data sourced here?
EPA SDWIS violations, UCMR 5 PFAS records, and CCR data — sources, accuracy notes, and limitations
Connecticut Water FAQs
Data sources: Utility compliance and violation data from EPA SDWIS (Safe Drinking Water Information System). PFAS monitoring records from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule 5, 2023–2025). Contaminant data from EPA and ATSDR public references. This page summarizes public records — it is not a compliance determination. Methodology →
Last updated: 2026-04-22