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Map of Radon Zones in Illinois based on Environmental Protection Agency (EPA) data

Back to Radon Zones in the United States




Radon zones
 Zone 3 (3 counties)
 Zone 2 (43 counties)
 Zone 1 (56 counties)
  Highest Potential: counties have a predicted average indoor radon screening level greater than 4 pCi/L (pico curies per liter) (red zones)
  Moderate Potential: counties have a predicted average indoor radon screening level between 2 and 4 pCi/L (orange zones)
  Low Potential: counties have a predicted average indoor radon screening level less than 2 pCi/L (yellow zones)
Adams County
Radon zone : 1

Alexander County
Radon zone : 3

Bond County
Radon zone : 2

Boone County
Radon zone : 1

Brown County
Radon zone : 1

Bureau County
Radon zone : 1

Calhoun County
Radon zone : 1

Carroll County
Radon zone : 1

Cass County
Radon zone : 1

Champaign County
Radon zone : 1

Christian County
Radon zone : 2

Clark County
Radon zone : 2

Clay County
Radon zone : 2

Clinton County
Radon zone : 2

Coles County
Radon zone : 1

Cook County
Radon zone : 2

Crawford County
Radon zone : 2

Cumberland County
Radon zone : 2

De Witt County
Radon zone : 1

DeKalb County
Radon zone : 1

Douglas County
Radon zone : 1

DuPage County
Radon zone : 2

Edgar County
Radon zone : 1

Edwards County
Radon zone : 2

Effingham County
Radon zone : 2

Fayette County
Radon zone : 2

Ford County
Radon zone : 1

Franklin County
Radon zone : 2

Fulton County
Radon zone : 1

Gallatin County
Radon zone : 2

Greene County
Radon zone : 1

Grundy County
Radon zone : 1

Hamilton County
Radon zone : 2

Hancock County
Radon zone : 1

Hardin County
Radon zone : 2

Henderson County
Radon zone : 1

Henry County
Radon zone : 1

Iroquois County
Radon zone : 1

Jackson County
Radon zone : 2

Jasper County
Radon zone : 2

Jefferson County
Radon zone : 2

Jersey County
Radon zone : 1

Jo Daviess County
Radon zone : 1

Johnson County
Radon zone : 2

Kane County
Radon zone : 1

Kankakee County
Radon zone : 2

Kendall County
Radon zone : 1

Knox County
Radon zone : 1

La Salle County
Radon zone : 1

Lake County
Radon zone : 2

Lawrence County
Radon zone : 2

Lee County
Radon zone : 1

Livingston County
Radon zone : 1

Logan County
Radon zone : 1

Macon County
Radon zone : 1

Macoupin County
Radon zone : 2

Madison County
Radon zone : 2

Marion County
Radon zone : 2

Marshall County
Radon zone : 1

Mason County
Radon zone : 1

Massac County
Radon zone : 3

McDonough County
Radon zone : 1

McHenry County
Radon zone : 2

McLean County
Radon zone : 1

Menard County
Radon zone : 1

Mercer County
Radon zone : 1

Monroe County
Radon zone : 2

Montgomery County
Radon zone : 2

Morgan County
Radon zone : 1

Moultrie County
Radon zone : 1

Ogle County
Radon zone : 1

Peoria County
Radon zone : 1

Perry County
Radon zone : 2

Piatt County
Radon zone : 1

Pike County
Radon zone : 1

Pope County
Radon zone : 2

Pulaski County
Radon zone : 3

Putnam County
Radon zone : 1

Randolph County
Radon zone : 2

Richland County
Radon zone : 2

Rock Island County
Radon zone : 1

Saline County
Radon zone : 2

Sangamon County
Radon zone : 1

Schuyler County
Radon zone : 1

Scott County
Radon zone : 1

Shelby County
Radon zone : 2

St. Clair County
Radon zone : 2

Stark County
Radon zone : 1

Stephenson County
Radon zone : 1

Tazewell County
Radon zone : 1

Union County
Radon zone : 2

Vermilion County
Radon zone : 1

Wabash County
Radon zone : 2

Warren County
Radon zone : 1

Washington County
Radon zone : 2

Wayne County
Radon zone : 2

White County
Radon zone : 2

Whiteside County
Radon zone : 1

Will County
Radon zone : 2

Williamson County
Radon zone : 2

Winnebago County
Radon zone : 1

Woodford County
Radon zone : 1


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