City Water Quality Rankings in Illinois
631 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#385
Woodridge
County, IL
65 C
#386 Bridgeview
County, IL
64 C
#387 Clifton
County, IL
64 C
#388 Dekalb
County, IL
64 C
#389 Edwardsville
County, IL
64 C
#390 Farmer City
County, IL
64 C
#391 Justice
County, IL
64 C
#392 Kirkland
County, IL
64 C
#393 Lake Barrington
County, IL
64 C
#394 Orion
County, IL
64 C
#395 Rockton
County, IL
64 C
#396 Seneca
County, IL
64 C
#397 Streamwood
County, IL
64 C
#398 Sullivan
County, IL
64 C
#399 Sycamore
County, IL
64 C
#400 Crestwood
County, IL
63 C
#401 Greenville
County, IL
63 C
#402 Harvey
County, IL
63 C
#403 Hazel Crest
County, IL
63 C
#404 Bridgeport
County, IL
62 C
#405 Cortland
County, IL
62 C
#406 Coulterville
County, IL
62 C
#407 New Lenox
County, IL
62 C
#408 Normal
County, IL
62 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.