City Water Quality Rankings in Illinois
635 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#385
Wauconda
County, IL
69 C
#386 Cicero
County, IL
68 C
#387 Elmwood
County, IL
68 C
#388 Fulton
County, IL
68 C
#389 Long Grove
County, IL
68 C
#390 Morton Grove
County, IL
68 C
#391 Oak Brook
County, IL
68 C
#392 Romeoville
County, IL
68 C
#393 Taylorville
County, IL
68 C
#394 Arcola
County, IL
67 C
#395 Bellwood
County, IL
67 C
#396 Kingston
County, IL
67 C
#397 Lake Bluff
County, IL
67 C
#398 Malta
County, IL
67 C
#399 Pingree Grove
County, IL
67 C
#400 Sugar Grove
County, IL
67 C
#401 Ashland
County, IL
66 C
#402 Caseyville
County, IL
66 C
#403 Eureka
County, IL
66 C
#404 Glenwood
County, IL
66 C
#405 Herrin
County, IL
66 C
#406 Highwood
County, IL
66 C
#407 Jonesboro
County, IL
66 C
#408 Knoxville
County, IL
66 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.