WaterQ

City Water Quality Rankings in Illinois

635 cities ranked by drinking water quality.

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Popular city water quality comparisons

Alto Pass, IL vs Aurora, IL Compare → Beach Park, IL vs Cahokia Heights, IL Compare → Chatham, IL vs Davis Junction, IL Compare → Evanston, IL vs Forrest, IL Compare →

Trending Cities

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#217
Manito
County, IL
82 B
#218
Oakwood
County, IL
82 B
#219
Rosemont
County, IL
82 B
#220
Stockton
County, IL
82 B
#221
Volo
County, IL
82 B
#222
Whittington
County, IL
82 B
#223
Centralia
County, IL
81 B
#224
East Alton
County, IL
81 B
#225
Henry
County, IL
81 B
#226
Hudson
County, IL
81 B
#227
Indian Head Park
County, IL
81 B
#228
Lena
County, IL
81 B
#229
Marshall
County, IL
81 B
#230
Palos Heights
County, IL
81 B
#231
Pocahontas
County, IL
81 B
#232
Shawneetown
County, IL
81 B
#233
Thornton
County, IL
81 B
#234
Athens
County, IL
80 B
#235
Cambria
County, IL
80 B
#236
Carrier Mills
County, IL
80 B
#237
Countryside
County, IL
80 B
#238
Crossville
County, IL
80 B
#239
Davis
County, IL
80 B
#240
Delavan
County, IL
80 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.

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