City Water Quality Rankings in Wisconsin
340 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#241
King
County, WI
84 B
#242 Ladysmith
County, WI
84 B
#243 Random Lake
County, WI
84 B
#244 Saukville
County, WI
84 B
#245 Waterloo
County, WI
84 B
#246 Waunakee
County, WI
84 B
#247 Waupaca
County, WI
84 B
#248 Denmark
County, WI
83 B
#249 Eagle River
County, WI
83 B
#250 Franklin
County, WI
83 B
#251 Hortonville
County, WI
83 B
#252 Madison
County, WI
83 B
#253 Middleton
County, WI
83 B
#254 St. Croix Falls
County, WI
83 B
#255 Superior
County, WI
83 B
#256 Westby
County, WI
83 B
#257 Brooklyn
County, WI
82 B
#258 Evansville
County, WI
82 B
#259 Grand Chute
County, WI
82 B
#260 Kaukauna
County, WI
82 B
#261 Manawa
County, WI
82 B
#262 Mazomanie
County, WI
82 B
#263 North Fond Du Lac
County, WI
82 B
#264 Clintonville
County, WI
81 B
Frequently Asked Questions
How are city water quality rankings calculated in Wisconsin?
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 Wisconsin?
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.