City Water Quality Rankings in Illinois
635 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#265
Watseka
County, IL
79 B
#266 West Chicago
County, IL
79 B
#267 Willowbrook
County, IL
79 B
#268 Wood Dale
County, IL
79 B
#269 Aviston
County, IL
78 B
#270 Cambridge
County, IL
78 B
#271 Creve Coeur
County, IL
78 B
#272 Dix
County, IL
78 B
#273 Hodgkins
County, IL
78 B
#274 Metamora
County, IL
78 B
#275 Modesto
County, IL
78 B
#276 Mulkeytown
County, IL
78 B
#277 Oglesby
County, IL
78 B
#278 Pittsfield
County, IL
78 B
#279 Round Lake Beach
County, IL
78 B
#280 Rushville
County, IL
78 B
#281 Shorewood
County, IL
78 B
#282 Wasco
County, IL
78 B
#283 Westchester
County, IL
78 B
#284 Albers
County, IL
77 B
#285 Bloomingdale
County, IL
77 B
#286 Cherry Valley
County, IL
77 B
#287 Elkville
County, IL
77 B
#288 Garden Homes
County, IL
77 B
Frequently Asked Questions
How are city water quality rankings calculated in Illinois?
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 Illinois?
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.