EPA Zone Data 2026
Missouri Radon Map, Levels & Testing Guide
View EPA radon zone classifications for every county in Missouri. Open your county to compare basement test meaning, EPA action thresholds, and when mitigation pricing becomes worth checking.
11
Zone 1
High Risk
High Risk
97
Zone 2
Moderate
Moderate
7
Zone 3
Low Risk
Low Risk
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Browse Counties
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Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Adair County
Zone 2
Andrew County
Zone 1
Atchison County
Zone 1
Audrain County
Zone 2
Barry County
Zone 2
Barton County
Zone 2
Bates County
Zone 2
Benton County
Zone 2
Bollinger County
Zone 2
Boone County
Zone 2
Buchanan County
Zone 1
Caldwell County
Zone 2
Callaway County
Zone 2
Camden County
Zone 2
Cape Girardeau County
Zone 2
Carroll County
Zone 2
Carter County
Zone 2
Cass County
Zone 1
Cedar County
Zone 2
Chariton County
Zone 2
Christian County
Zone 2
Clark County
Zone 2
Clay County
Zone 1
Clinton County
Zone 1
Cole County
Zone 2
Cooper County
Zone 2
Crawford County
Zone 2
Dade County
Zone 2
Dallas County
Zone 2
Daviess County
Zone 2
DeKalb County
Zone 2
Dent County
Zone 2
Douglas County
Zone 2
Franklin County
Zone 2
Gasconade County
Zone 2
Gentry County
Zone 2
Greene County
Zone 2
Grundy County
Zone 2
Harrison County
Zone 2
Henry County
Zone 2
Hickory County
Zone 2
Holt County
Zone 1
Howard County
Zone 2
Howell County
Zone 2
Iron County
Zone 1
Jackson County
Zone 1
Jasper County
Zone 2
Jefferson County
Zone 2
Johnson County
Zone 2
Knox County
Zone 2
Laclede County
Zone 2
Lafayette County
Zone 2
Lawrence County
Zone 2
Lewis County
Zone 2
Lincoln County
Zone 2
Linn County
Zone 2
Livingston County
Zone 2
Macon County
Zone 2
Madison County
Zone 2
Maries County
Zone 2
Marion County
Zone 2
McDonald County
Zone 2
Mercer County
Zone 2
Miller County
Zone 2
Moniteau County
Zone 2
Monroe County
Zone 2
Montgomery County
Zone 2
Morgan County
Zone 2
Newton County
Zone 2
Nodaway County
Zone 1
Oregon County
Zone 2
Osage County
Zone 2
Ozark County
Zone 2
Perry County
Zone 2
Pettis County
Zone 2
Phelps County
Zone 2
Pike County
Zone 2
Platte County
Zone 1
Polk County
Zone 2
Pulaski County
Zone 2
Putnam County
Zone 2
Ralls County
Zone 2
Randolph County
Zone 2
Ray County
Zone 2
Reynolds County
Zone 2
Ripley County
Zone 2
Saline County
Zone 2
Schuyler County
Zone 2
Scotland County
Zone 2
Shannon County
Zone 2
Shelby County
Zone 2
St. Charles County
Zone 2
St. Clair County
Zone 2
St. Francois County
Zone 2
St. Louis County
Zone 2
St. Louis County
Zone 2
Ste. Genevieve County
Zone 2
Stone County
Zone 2
Sullivan County
Zone 2
Taney County
Zone 2
Texas County
Zone 2
Vernon County
Zone 2
Warren County
Zone 2
Washington County
Zone 2
Wayne County
Zone 2
Webster County
Zone 2
Worth County
Zone 2
Wright County
Zone 2
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