City Water Quality Rankings in Connecticut
54 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#1
Norwalk
County, CT
100 A
#2 Tolland
County, CT
100 A
#3 Uncasville
County, CT
100 A
#4 New Britain
County, CT
97 A
#5 Hartford
County, CT
96 A
#6 Storrs
County, CT
96 A
#7 Wolcott
County, CT
96 A
#8 Mansfield Center
County, CT
95 A
#9 Mashantucket
County, CT
94 A
#10 Wilton
County, CT
93 A
#11 Cromwell
County, CT
92 A
#12 Clinton
County, CT
90 A
#13 Coventry
County, CT
90 A
#14 Meriden
County, CT
90 A
#15 New Haven
County, CT
90 A
#16 Granby
County, CT
89 B
#17 Monroe
County, CT
88 B
#18 Winsted
County, CT
88 B
#19 Gales Ferry
County, CT
87 B
#20 Norwich
County, CT
87 B
#21 Groton
County, CT
85 B
#22 Manchester
County, CT
84 B
#23 Niantic
County, CT
84 B
#24 Old Lyme
County, CT
84 B
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.