Illinois
Water Hardness Map
City
Aurora
Carol Stream
Champaign
Chicago
Cicero
Columbus
Crystal Lake
Danville
Decatur
Dekalb
Des Plaines
Downers Grove
East Peoria
East Saint Louis
Elgin
Elmhurst
Elmwood Park
Evanston
Glenview
Granite City
Joilet
Kankakee
Lombard
Melrose Park
Moline
Mount Prospect
Naperville
Oak Lawn
Oak Park
Orland Park
Palatine
Peoria
Plainfield
Rockford
Romeoville
Springfield
Water Hardness (PPM)
127
418
258
148
187
120
137
191
194
188
350
288
250
210
171
362
218
333
299
250
388
196
344
222
210
247
288
222
212
323
245
250
280
308
395
88