Skip to content
lung.com

Radon zones in Missouri

The EPA assigns every county in Missouri to one of three radon potential zones. 11 are in Zone 1, the highest category, home to about 22% of the state's residents.

115
Counties
11
Zone 1 counties
Predicted average above 4 pCi/L
97
Zone 2 counties
Predicted average 2-4 pCi/L
7
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Missouri

Every county in Missouri, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 11Zone 2 · 97Zone 3 · 7

Hover a county · click to open it

County by county

All 115 Missouri counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Andrew County118k8.1%15.4%56.0
Atchison County15,10710.9%18.0%49.7
Buchanan County183k9.3%18.6%47.4
Cass County1112k7.3%14.9%37.9
Clay County1260k6.4%14.2%38.0
Clinton County122k8.6%17.0%43.2
Holt County14,24810.3%17.6%40.1
Iron County19,44011.5%20.5%68.9
Jackson County1719k7.4%15.8%37.6
Nodaway County121k7.7%14.7%30.7
Platte County1112k5.9%12.1%26.0
Adair County225k7.5%14.3%37.9
Audrain County224k10.7%20.2%51.1
Barry County235k11.3%20.2%47.2
Barton County212k12.2%21.6%36.0
Bates County216k10.7%20.5%46.0
Benton County221k12.4%19.3%60.5
Bollinger County211k11.2%20.6%49.8
Boone County2189k6.0%12.2%31.8
Caldwell County28,9559.8%18.5%36.5
Callaway County245k8.4%16.7%42.8
Camden County244k10.2%16.4%43.7
Cape Girardeau County283k7.7%14.9%33.4
Carroll County28,39110.3%18.3%41.2
Carter County25,30312.7%22.6%64.9
Cedar County215k12.2%20.3%38.7
Chariton County27,39910.4%17.8%46.4
Christian County294k7.2%14.8%35.7
Clark County26,64111.7%21.0%40.8
Cole County277k7.1%13.9%33.1
Cooper County217k8.6%16.6%48.0
Crawford County223k11.0%20.3%66.9
Dade County27,71612.2%20.9%51.4
Dallas County218k11.7%21.4%49.5
Daviess County28,55111.2%19.6%43.1
DeKalb County29,8999.0%17.4%57.0
Dent County215k11.2%19.9%59.8
Douglas County212k11.7%20.1%42.9
Franklin County2106k8.5%16.4%44.6
Gasconade County215k10.0%17.6%39.4
Gentry County26,28710.1%19.3%45.9
Greene County2305k7.8%15.4%38.1
Grundy County29,81511.2%19.4%45.6
Harrison County28,22011.5%19.7%43.2
Henry County222k11.1%19.7%49.8
Hickory County28,71816.0%23.2%51.0
Howard County210k8.5%15.7%47.9
Howell County241k12.0%21.6%52.5
Jasper County2125k9.2%18.5%46.0
Jefferson County2231k7.9%16.5%50.6
Johnson County255k6.9%15.2%42.7
Knox County23,72312.4%21.2%65.1
Laclede County237k11.1%21.1%58.5
Lafayette County233k8.5%16.5%39.3
Lawrence County239k10.7%20.4%47.6
Lewis County29,8189.9%18.8%49.9
Lincoln County265k7.9%17.6%52.3
Linn County212k10.4%18.8%47.7
Livingston County215k9.7%18.7%49.0
Macon County215k9.3%16.9%62.2
Madison County213k9.8%19.3%71.3
Maries County28,43010.3%18.8%60.5
Marion County228k9.1%17.3%47.5
McDonald County224k11.9%23.3%54.7
Mercer County23,46911.8%20.0% -
Miller County226k9.9%18.6%46.0
Moniteau County215k8.7%18.0%49.5
Monroe County28,69811.4%19.3%36.2
Montgomery County211k10.6%19.5%63.7
Morgan County222k12.5%21.1%51.2
Newton County261k9.5%17.9%45.6
Oregon County28,72013.3%22.8%53.1
Osage County213k8.0%16.0%40.1
Ozark County28,97014.9%23.1%61.1
Perry County219k9.2%17.5%39.2
Pettis County244k9.0%17.9%56.2
Phelps County245k8.4%16.4%28.9
Pike County218k10.3%20.3%38.2
Polk County233k10.1%18.9%38.6
Pulaski County254k5.8%15.0%40.2
Putnam County24,6389.9%17.1%47.5
Ralls County210k10.5%18.9%40.4
Randolph County224k9.6%19.4%57.4
Ray County223k9.6%18.7%63.3
Reynolds County25,95012.7%21.8%46.9
Ripley County211k12.8%23.0%68.1
Saline County223k8.2%16.2%52.6
Schuyler County24,0538.9%17.3% -
Scotland County24,67610.4%19.1% -
Shannon County27,23811.7%20.7%80.5
Shelby County25,93111.8%20.5%58.0
St. Charles County2417k5.8%12.2%33.9
St. Clair County29,75212.5%20.9%48.5
St. Francois County267k10.1%20.7%73.4
St. Louis city2282k7.4%16.5%41.6
St. Louis County2987k6.5%13.2%33.9
Ste. Genevieve County219k9.1%17.1%32.2
Stone County233k11.3%17.3%38.0
Sullivan County25,79710.3%18.7%39.0
Taney County257k9.5%16.8%34.3
Texas County226k12.2%21.7%45.2
Vernon County220k11.3%20.5%52.9
Warren County238k8.7%17.1%43.0
Washington County224k11.9%22.9%64.4
Wayne County211k14.3%23.9%69.9
Webster County241k9.4%19.4%51.4
Worth County21,90711.7%19.2% -
Wright County219k12.6%23.0%44.0
Butler County342k11.8%22.1%58.8
Dunklin County327k12.3%22.8%69.3
Mississippi County312k12.3%23.6%57.7
New Madrid County315k11.9%21.4%76.0
Pemiscot County315k13.3%24.8%65.4
Scott County338k9.9%19.2%46.4
Stoddard County328k11.4%21.6%61.3

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Highest potential

Zone 1 counties in Missouri

These 11 counties have a predicted average indoor radon screening level above the EPA action level. The EPA recommends every home in them be tested.

Other states

Radon zones elsewhere