City Water Quality Rankings in Connecticut
54 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#25
Groton
County, CT
84 B
#26 Niantic
County, CT
84 B
#27 Old Lyme
County, CT
84 B
#28 Ridgefield
County, CT
84 B
#29 Enfield
County, CT
82 B
#30 Middletown
County, CT
82 B
#31 Waterford
County, CT
82 B
#32 Baltic
County, CT
80 B
#33 Bristol
County, CT
79 B
#34 Watertown
County, CT
78 B
#35 Wethersfield
County, CT
77 B
#36 Weston
County, CT
76 B
#37 Oakville
County, CT
75 B
#38 Noank
County, CT
74 C
#39 Tariffville
County, CT
70 C
#40 Waterbury
County, CT
70 C
#41 Southington
County, CT
69 C
#42 Woodstock
County, CT
69 C
#43 Colchester
County, CT
67 C
#44 Meriden
County, CT
66 C
#45 Portland
County, CT
62 C
#46 Dayville
County, CT
58 D
#47 Berlin
County, CT
42 F
#48 New Fairfield
County, CT
42 F
Frequently Asked Questions
How are city water quality rankings calculated in Connecticut?
WaterQ city rankings are based on EPA SDWIS data across local public water systems, including contaminant detections, compliance violations, and recency-weighted score signals.
Can I compare two cities in Connecticut?
Yes. Use the city comparison links on this page or open the Compare tool to evaluate two cities side by side on score, grade, and water system coverage.
How often does WaterQ refresh city data?
City-level metrics refresh when new EPA data is processed. Check city pages for latest score and violation context.