Connecticut Water Quality Reports
Comprehensive water quality data for 159 cities across Connecticut. View EPA-verified contaminant levels and get filter recommendations.
159
Cities
9
Safe
107
Monitor
43
At Risk
Water Quality by County
Explore aggregated water quality scores across Connecticut counties. Scores are calculated based on EPA data and weighted by population.
Loading map...
Data from 153 cities serving 0 people across 0 counties.
Common Contaminants in Connecticut
149 cities in Connecticut have at least one contaminant above EPA health guidelines.
Worried about Bromodichloromethane in your water?
Upload your water test (PDF or a photo) and we'll email a plain-English reading of your Bromodichloromethane result β and every other number β free. Educational only, no medical claims.
Your upload also helps us keep local water data accurate β we only ever share anonymized, area-level summaries.
Upload my testCities in Connecticut
Derby
People Served772K
Contaminants Tested302
Above Guidelines7
View Report β
Newington
People Served464K
Contaminants Tested290
Above Guidelines6
View Report β
Ansonia
People Served420K
Contaminants Tested167
Above Guidelines5
View Report β
Orange
People Served419K
Contaminants Tested271
Above Guidelines2
View Report β
Branford Center
People Served419K
Contaminants Tested147
Above Guidelines2
View Report β
Cheshire Village
People Served419K
Contaminants Tested147
Above Guidelines2
View Report β
East Haven
People Served419K
Contaminants Tested147
Above Guidelines2
View Report β
Milford
People Served419K
Contaminants Tested147
Above Guidelines2
View Report β
New Haven
People Served419K
Contaminants Tested147
Above Guidelines2
View Report β
North Haven
People Served419K
Contaminants Tested147
Above Guidelines2
View Report β
Northford
People Served419K
Contaminants Tested147
Above Guidelines2
View Report β
Quinnipiac University
People Served419K
Contaminants Tested147
Above Guidelines2
View Report β
West Haven
People Served419K
Contaminants Tested147
Above Guidelines2
View Report β
Woodmont
People Served419K
Contaminants Tested147
Above Guidelines2
View Report β
Wethersfield
People Served393K
Contaminants Tested282
Above Guidelines7
View Report β
East Hartford
People Served391K
Contaminants Tested272
Above Guidelines6
View Report β
Blue Hills
People Served391K
Contaminants Tested147
Above Guidelines4
View Report β
Glastonbury Center
People Served391K
Contaminants Tested147
Above Guidelines4
View Report β
Hartford
People Served391K
Contaminants Tested147
Above Guidelines4
View Report β
West Hartford
People Served391K
Contaminants Tested147
Above Guidelines4
View Report β
Long Hill
People Served382K
Contaminants Tested262
Above Guidelines3
View Report β
Shelton
People Served368K
Contaminants Tested1223
Above Guidelines25
View Report β
Newtown
People Served352K
Contaminants Tested270
Above Guidelines8
View Report β
Stamford
People Served352K
Contaminants Tested387
Above Guidelines6
View Report β
Tashua
People Served352K
Contaminants Tested258
Above Guidelines5
View Report β
Bridgeport
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Byram
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Coleytown
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Compo
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Cos Cob
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Daniels Farm
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Darien Downtown
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
East Village
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Fairfield University
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Georgetown
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Glenville
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Greens Farms
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Greenwich
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Indian Field
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Lordship
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Mill Plain
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Murray
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
New Canaan
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Noroton Heights
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Noroton
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Norwalk
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Old Greenwich
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Old Hill
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Oronoque
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Pemberwick
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Plattsville
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Poplar Plains
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Ridgefield
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Riverside
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Rock Ridge
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Route 7 Gateway
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Sacred Heart University
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Sandy Hook
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Saugatuck
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
South Wilton
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Southport
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Staples
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Stepney
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Stratford Downtown
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Tokeneke
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Trumbull Center
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
West Mountain
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Westport Village
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Wilton Center
People Served352K
Contaminants Tested135
Above Guidelines2
View Report β
Bristol
People Served149K
Contaminants Tested556
Above Guidelines9
View Report β
Waterbury
People Served140K
Contaminants Tested450
Above Guidelines14
View Report β
Oakville
People Served118K
Contaminants Tested181
Above Guidelines9
View Report β
Hazardville
People Served117K
Contaminants Tested316
Above Guidelines4
View Report β
Southwood Acres
People Served117K
Contaminants Tested316
Above Guidelines4
View Report β
New Britain
People Served99K
Contaminants Tested304
Above Guidelines6
View Report β
Broad Brook
People Served99K
Contaminants Tested420
Above Guidelines4
View Report β
Rockville
People Served99K
Contaminants Tested149
Above Guidelines2
View Report β
Sherwood Manor
People Served99K
Contaminants Tested149
Above Guidelines2
View Report β
Somers
People Served99K
Contaminants Tested149
Above Guidelines2
View Report β
Suffield Depot
People Served99K
Contaminants Tested149
Above Guidelines2
View Report β
Thompsonville
People Served99K
Contaminants Tested149
Above Guidelines2
View Report β
Windsor Locks
People Served99K
Contaminants Tested149
Above Guidelines2
View Report β
Kensington
People Served89K
Contaminants Tested311
Above Guidelines8
View Report β
Bethel
People Served72K
Contaminants Tested279
Above Guidelines5
View Report β
Danbury
People Served64K
Contaminants Tested777
Above Guidelines15
View Report β
Ridgebury
People Served62K
Contaminants Tested145
Above Guidelines2
View Report β
Meriden
People Served58K
Contaminants Tested138
Above Guidelines2
View Report β
Terryville
People Served58K
Contaminants Tested271
Above Guidelines5
View Report β
Clinton
People Served55K
Contaminants Tested1411
Above Guidelines46
View Report β
Manchester
People Served51K
Contaminants Tested140
Above Guidelines2
View Report β
Stonington
People Served46K
Contaminants Tested167
Above Guidelines8
View Report β
New London
People Served44K
Contaminants Tested138
Above Guidelines1
View Report β
Waterford
People Served44K
Contaminants Tested138
Above Guidelines1
View Report β
Middletown
People Served44K
Contaminants Tested417
Above Guidelines5
View Report β
Plantsville
People Served43K
Contaminants Tested142
Above Guidelines3
View Report β
Southington
People Served43K
Contaminants Tested142
Above Guidelines3
View Report β
Northwest Harwinton
People Served38K
Contaminants Tested147
Above Guidelines2
View Report β
Torrington
People Served38K
Contaminants Tested147
Above Guidelines2
View Report β
Mashantucket
People Served38K
Contaminants Tested0
Above Guidelines0
View Report β
Wallingford Center
People Served37K
Contaminants Tested133
Above Guidelines2
View Report β
Showing top 100 of 159 cities by population.
Use the search box above to find any city in Connecticut.
Stay Informed About Your Water Quality
Get EPA reports, filter recommendations, and safety alerts for your area.
Join 10,000+ people protecting their families. Unsubscribe anytime.