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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#289
Glasford
County, IL
77 B
#290
Marine
County, IL
77 B
#291
Metropolis
County, IL
77 B
#292
Northbrook
County, IL
77 B
#293
River Forest
County, IL
77 B
#294
Springfield
County, IL
77 B
#295
Valmeyer
County, IL
77 B
#296
Western Springs
County, IL
77 B
#297
Auburn
County, IL
76 B
#298
Breese
County, IL
76 B
#299
Chicago Heights
County, IL
76 B
#300
Crainville
County, IL
76 B
#301
Effingham
County, IL
76 B
#302
Glendale Heights
County, IL
76 B
#303
Greenville
County, IL
76 B
#304
Hometown
County, IL
76 B
#305
Libertyville
County, IL
76 B
#306
Mattoon
County, IL
76 B
#307
Paris
County, IL
76 B
#308
Sandoval
County, IL
76 B
#309
Sesser
County, IL
76 B
#310
St Anne
County, IL
76 B
#311
Trenton
County, IL
76 B
#312
Waterman
County, IL
76 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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