Water in Connecticut.
Connecticut's older urban housing stock means lead service lines remain a real exposure pathway. PFAS contamination from a 2019 Bradley Airport firefighting-foam spill drove statewide concern. Industrial groundwater plumes affect several legacy manufacturing communities.
How Connecticut regulates drinking water.
Federal SDWA primacy. State established a PFAS Task Force in 2019 with a Drinking Water Action Level of 70 ng/L combined PFOA+PFOS. Lead service line inventory required by 2027.
Connecticut Department of Public Health — Drinking Water Section
Connecticut's water history, in order.
The contamination events, regulatory shifts, and major settlements that define how this state thinks about drinking water today.
- 2019
Bradley International Airport spills 40,000 gallons of PFAS firefighting foam into Windsor Locks.
- 2020
Connecticut PFAS Task Force publishes state-action plan.
- 2023
State mandates lead service line inventory across all community systems.
The actual water you drink.
The physical rivers, aquifers, lakes, and reservoirs that feed Connecticut's public water systems. Source quality is the foundation of tap quality — and where the long-term protection fights happen.
- riverConnecticut River
Hartford area.
- reservoirHemlock Reservoir System
Aquarion Bridgeport/Fairfield County supply.
- reservoirSaugatuck Reservoir
Coastal Fairfield County.
- aquiferCoastal Plain Aquifer
Eastern CT groundwater systems.
Source-water mix
~55% surface water, ~45% groundwater
Major cities served
Bridgeport · New Haven · Hartford · Stamford · Waterbury
Who actually serves the water.
The largest public water systems in Connecticut by population served. Click your ZIP after to see the full live EWG report for your specific utility.
- Aquarion Water CompanyBridgeport / Greenwich / Stamford670Kserved
- Metropolitan District CommissionHartford metro400Kserved
- South Central Connecticut Regional Water AuthorityNew Haven430Kserved
- Connecticut Water CompanyMulti-region350Kserved
Where the contamination comes from.
Every state has a different industrial fingerprint. The industries below are the dominant historical and active contamination sources in Connecticut's drinking water systems.
Legacy manufacturing in Waterbury, New Britain, and Bridgeport drove industrial chlorinated solvents (TCE) contamination in groundwater. Bradley Airport firefighting foam (2019) introduced major PFAS contamination in Windsor Locks corridor. Naval Submarine Base New London is a documented PFAS site.
What state data flags most consistently.
Drawn from EPA SDWIS sampling records, EWG state summaries, and regional regulatory action over the past five years. Read the full deep dive on each.
Lead
A neurotoxic metal that leaches from old pipes and solder. No safe level for children.
PFAS (Forever Chemicals)
A class of ~15,000 synthetic chemicals that don't break down. Now regulated for the first time.
Trihalomethanes (TTHMs)
Byproducts of chlorinating water. Linked to bladder cancer at chronic exposure.
Chromium-6 (Hexavalent Chromium)
The Erin Brockovich chemical. A known carcinogen with no federal-specific limit yet.
Risk isn't evenly distributed.
Residents in pre-1986 housing across Bridgeport, Hartford, and New Haven face elevated lead exposure. Households downstream of Windsor Locks face PFAS.
~23% of households on private wells, predominantly in eastern and northwestern CT with significant arsenic.
What's coming for Connecticut's water.
Coastal sea-level rise threatens municipal wellfields in coastal Fairfield and New Haven counties. More frequent intense rainfall increases combined-sewer-overflow events near intakes. Storm-driven Long Island Sound salinity increases.
Voluntary statewide
CT Department of Public Health provides voluntary technical and lab support; many districts have voluntarily tested post-Flint.
Five questions for your next Consumer Confidence Report.
Your utility is required to send you a Consumer Confidence Report annually. Most are dense and procedural. These are the questions worth following up on for Connecticut specifically.
- 1
Is my utility downstream of the 2019 Bradley Airport PFAS spill?
- 2
When will my utility complete its mandated lead service line inventory?
- 3
Has my system had any health-based violations in the past three years?
- 4
Are private wells in my town routinely tested for PFAS?
Most state regulators allow public records requests for the underlying lab reports behind your CCR — your utility should be able to provide them on request.
What's changed in Connecticut water law.
Drinking water regulation moves at the state level as much as the federal level. Below are notable recent bills and regulatory actions specific to Connecticut.
- 2021
HB 6502 — Lead Service Line Inventory mandate with 2027 deadline.
- 2021
SB 837 — PFAS consumer product restrictions (firefighting foam, food packaging).
For lead: NSF/ANSI 53 carbon block specifically certified for lead reduction. For private-well arsenic in the east: NSF/ANSI 58 reverse osmosis.
We don't recommend brands — the NSF/ANSI certification number matters more than the name on the box.
This is the state. Your address is the answer.
State-level patterns don't tell you about your specific tap. Run your ZIP for the live EWG contaminant report on your utility — or build a personalized Water File for your household.
Source-water mix, utility counts, lead-service-line estimates, and private-well shares are approximate, drawn from EPA SDWIS public data and state primacy-agency summaries. Contaminant rankings reflect EWG state-level monitoring data and regional regulatory action — they are not exhaustive. Timeline events are publicly documented. See methodology for the full sourcing. Search EPA SDWIS for Connecticut