WaterQ

City Water Quality Rankings in Illinois

631 cities ranked by drinking water quality.

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Popular city water quality comparisons

Alto Pass, IL vs Beach Park, IL Compare → Cahokia Heights, IL vs Chatham, IL Compare → Davis Junction, IL vs Evanston, IL Compare → Freeport, IL vs Groveland, IL Compare →

Trending Cities

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#265
Crainville
County, IL
76 B
#266
Dix
County, IL
76 B
#267
Effingham
County, IL
76 B
#268
Geneseo
County, IL
76 B
#269
Gilman
County, IL
76 B
#270
Glendale Heights
County, IL
76 B
#271
Granite City
County, IL
76 B
#272
Monticello
County, IL
76 B
#273
Paris
County, IL
76 B
#274
Richmond
County, IL
76 B
#275
Rockford
County, IL
76 B
#276
Sandoval
County, IL
76 B
#277
Schaumburg
County, IL
76 B
#278
Sesser
County, IL
76 B
#279
Glen Ellyn
County, IL
75 B
#280
Hometown
County, IL
75 B
#281
La Grange
County, IL
75 B
#282
Littleton
County, IL
75 B
#283
Oak Forest
County, IL
75 B
#284
Rushville
County, IL
75 B
#285
Thornton
County, IL
75 B
#286
Westchester
County, IL
75 B
#287
Berkeley
County, IL
74 C
#288
Bloomington
County, IL
74 C

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.

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