waterbycounty

Illinois Water Quality

Drinking water data for all 102 counties.

Avg Water Score

99.8

State Grade

A

Counties with Data

102

of 102 total

All Illinois Counties

CountyWater Score
Alexander County100.0
Boone County100.0
Brown County100.0
Cass County100.0
Champaign County100.0
Clay County100.0
Coles County100.0
Cook County100.0
Crawford County100.0
De Witt County100.0
DeKalb County100.0
DuPage County100.0
Edwards County100.0
Franklin County100.0
Gallatin County100.0
Henderson County100.0
Jasper County100.0
Jefferson County100.0
Jersey County100.0
Kane County100.0
Kendall County100.0
Knox County100.0
Lake County100.0
Lawrence County100.0
Madison County100.0
Marion County100.0
McHenry County100.0
Mercer County100.0
Monroe County100.0
Montgomery County100.0
Moultrie County100.0
Ogle County100.0
Peoria County100.0
Pike County100.0
St. Clair County100.0
Stephenson County100.0
Tazewell County100.0
Vermilion County100.0
Wabash County100.0
Washington County100.0
White County100.0
Will County100.0
Winnebago County100.0
Adams County99.9
Calhoun County99.9
Carroll County99.9
Clark County99.9
Ford County99.9
Grundy County99.9
Hamilton County99.9
Jo Daviess County99.9
Logan County99.9
Macon County99.9
Mason County99.9
Massac County99.9
Pulaski County99.9
Rock Island County99.9
Saline County99.9
Sangamon County99.9
Warren County99.9
Whiteside County99.9
Cumberland County99.8
Greene County99.8
Hardin County99.8
Kankakee County99.8
Livingston County99.8
McLean County99.8
Piatt County99.8
Shelby County99.8
Bureau County99.7
Clinton County99.7
Douglas County99.7
Edgar County99.7
Fayette County99.7
Henry County99.7
Marshall County99.7
Menard County99.7
Perry County99.7
Randolph County99.7
Schuyler County99.7
Stark County99.7
Williamson County99.7
Hancock County99.6
Iroquois County99.6
Jackson County99.6
Morgan County99.6
Richland County99.6
Putnam County99.5
Christian County99.4
Effingham County99.4
Fulton County99.4
Lee County99.4
McDonough County99.4
Woodford County99.4
Macoupin County99.2
Johnson County99.1
LaSalle County99.1
Wayne County99.1
Pope County98.9
Scott County98.8
Bond County98.7
Union County98.4

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Data Source

Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

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