City Water Quality Rankings in Connecticut
54 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#1
Hartford
County, CT
100 A
#2 Norwalk
County, CT
100 A
#3 Tolland
County, CT
100 A
#4 Uncasville
County, CT
100 A
#5 Cromwell
County, CT
98 A
#6 Mashantucket
County, CT
98 A
#7 New Britain
County, CT
97 A
#8 Storrs
County, CT
96 A
#9 Wolcott
County, CT
96 A
#10 Mansfield Center
County, CT
95 A
#11 Wilton
County, CT
93 A
#12 Ledyard
County, CT
92 A
#13 Putnam
County, CT
92 A
#14 Clinton
County, CT
90 A
#15 Granby
County, CT
90 A
#16 New Haven
County, CT
90 A
#17 Kensington
County, CT
89 B
#18 Shelton
County, CT
89 B
#19 Coventry
County, CT
88 B
#20 Winsted
County, CT
88 B
#21 Norwich
County, CT
87 B
#22 Gales Ferry
County, CT
86 B
#23 Manchester
County, CT
86 B
#24 Monroe
County, CT
86 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.