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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#313
Bloomington
County, IL
75 B
#314
East Dubuque
County, IL
75 B
#315
Glen Ellyn
County, IL
75 B
#316
La Grange
County, IL
75 B
#317
Oak Forest
County, IL
75 B
#318
Barry
County, IL
74 C
#319
Berkeley
County, IL
74 C
#320
Broadview
County, IL
74 C
#321
Canton
County, IL
74 C
#322
Carrollton
County, IL
74 C
#323
Cuba
County, IL
74 C
#324
Danvers
County, IL
74 C
#325
East Hazel Crest
County, IL
74 C
#326
East Peoria
County, IL
74 C
#327
Ladd
County, IL
74 C
#328
Lynwood
County, IL
74 C
#329
Lyons
County, IL
74 C
#330
Meredosia
County, IL
74 C
#331
Minooka
County, IL
74 C
#332
Pierron
County, IL
74 C
#333
Poplar Grove
County, IL
74 C
#334
Roselle
County, IL
74 C
#335
Skokie
County, IL
74 C
#336
Deerfield
County, IL
73 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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