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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#73
Bluford
County, IL
92 A
#74
Brownstown
County, IL
92 A
#75
Clifton
County, IL
92 A
#76
Crete
County, IL
92 A
#77
El Paso
County, IL
92 A
#78
Forreston
County, IL
92 A
#79
Galesburg
County, IL
92 A
#80
Gilberts
County, IL
92 A
#81
Gridley
County, IL
92 A
#82
Hickory Hills
County, IL
92 A
#83
Island Lake
County, IL
92 A
#84
Manhattan
County, IL
92 A
#85
Marengo
County, IL
92 A
#86
New Baden
County, IL
92 A
#87
Nokomis
County, IL
92 A
#88
Northfield
County, IL
92 A
#89
Olney
County, IL
92 A
#90
Pawnee
County, IL
92 A
#91
Pecatonica
County, IL
92 A
#92
Roodhouse
County, IL
92 A
#93
Sleepy Hollow
County, IL
92 A
#94
Teutopolis
County, IL
92 A
#95
Troy
County, IL
92 A
#96
Valier
County, IL
92 A

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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