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Radon zones in Kansas

The EPA assigns every county in Kansas to one of three radon potential zones. 65 are in Zone 1, the highest category, home to about 55% of the state's residents.

105
Counties
65
Zone 1 counties
Predicted average above 4 pCi/L
40
Zone 2 counties
Predicted average 2-4 pCi/L
0
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Kansas

Every county in Kansas, 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 · 65Zone 2 · 40Zone 3 · 0

Hover a county · click to open it

County by county

All 105 Kansas counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Atchison County116k7.6%15.3%32.8
Barton County125k9.0%16.3%31.0
Brown County19,2509.0%17.7%55.6
Cheyenne County12,63610.3%17.7% -
Clay County18,0078.8%16.5%48.4
Cloud County18,8548.4%15.9%36.8
Decatur County12,7128.5%14.1% -
Dickinson County118k7.8%15.0%41.1
Douglas County1121k5.3%11.6%29.7
Ellis County129k6.6%13.1%27.4
Ellsworth County16,3577.4%14.7% -
Finney County137k6.5%15.3%24.8
Ford County134k6.6%15.5%27.0
Geary County135k5.9%16.4%69.0
Gove County12,7358.1%15.2% -
Graham County12,3769.4%15.3% -
Grant County17,1475.5%12.6% -
Gray County15,7437.6%15.6% -
Greeley County11,1816.9%13.4% -
Hamilton County12,4376.5%14.5% -
Haskell County13,6307.9%16.2% -
Hodgeman County11,6556.9%13.3% -
Jackson County113k7.9%15.8%37.8
Jewell County12,84711.0%17.3% -
Johnson County1622k4.6%9.7%24.3
Kearny County13,8237.3%15.7% -
Kingman County17,0668.2%16.4%66.5
Kiowa County12,3747.7%13.9% -
Lane County11,5298.3%14.4% -
Leavenworth County184k6.0%13.6%39.2
Lincoln County12,9209.6%16.2% -
Logan County12,6658.4%15.9% -
Marion County112k8.2%15.0%35.9
Marshall County19,9339.1%17.3%42.8
McPherson County130k6.8%13.6%24.6
Meade County13,9118.0%15.8% -
Mitchell County15,7198.4%15.6%37.9
Nemaha County110k7.6%14.7%34.7
Ness County12,6188.7%15.1% -
Norton County15,3308.6%17.4% -
Osborne County13,4279.3%15.7% -
Ottawa County15,8188.2%15.6%37.6
Pawnee County16,1268.1%16.5%47.7
Phillips County14,7619.3%16.2% -
Pottawatomie County126k6.1%13.6%32.4
Pratt County19,0827.7%14.8%32.1
Rawlins County12,4639.9%16.8% -
Republic County14,6279.9%16.3%36.1
Rice County19,2607.4%14.5%42.2
Riley County171k4.9%11.8%32.8
Rooks County14,7788.2%15.0%54.0
Rush County12,8309.4%16.3% -
Russell County16,7239.8%17.1%40.7
Saline County153k7.6%15.1%33.8
Scott County14,9226.9%13.3% -
Sheridan County12,4237.5%13.7% -
Sherman County15,8447.8%15.1% -
Smith County13,5908.7%14.7% -
Stanton County11,9018.3%16.3% -
Thomas County17,8656.5%12.7% -
Trego County12,7317.8%13.9% -
Wallace County11,5099.0%15.5% -
Washington County15,5048.0%14.9%31.7
Wichita County12,0828.6%16.0% -
Wyandotte County1165k7.4%17.6%51.6
Allen County212k8.5%16.5%50.6
Anderson County27,8389.3%18.1%39.7
Barber County24,0719.4%16.4%51.8
Bourbon County214k8.9%16.9%31.7
Butler County269k6.6%14.4%38.7
Chase County22,5799.3%16.4% -
Chautauqua County23,34710.9%19.1% -
Cherokee County219k9.7%18.9%57.3
Clark County21,8477.6%13.9% -
Coffey County28,2518.5%16.2%37.1
Comanche County21,6558.7%15.1% -
Cowley County234k8.0%15.7%46.3
Crawford County239k7.9%16.4%47.5
Doniphan County27,4937.5%15.3%49.1
Edwards County22,7338.8%16.7% -
Elk County22,46711.1%18.4%68.6
Franklin County226k7.7%16.1%45.9
Greenwood County25,8709.9%17.4%35.6
Harper County25,43510.6%19.2%39.4
Harvey County234k7.2%13.8%28.4
Jefferson County218k7.3%14.6%43.6
Labette County220k9.4%17.9%50.7
Linn County29,8608.4%16.1%46.6
Lyon County232k7.2%14.8%26.9
Miami County235k6.7%13.8%41.1
Montgomery County231k9.4%17.9%44.9
Morris County25,3348.9%15.2%33.6
Morton County22,5808.8%16.6% -
Neosho County215k8.9%16.6%45.3
Osage County216k8.4%16.4%46.2
Reno County261k8.3%16.9%36.6
Sedgwick County2528k7.1%15.1%38.7
Seward County221k6.0%15.0%27.6
Shawnee County2178k7.4%15.2%35.9
Stafford County23,9098.4%15.3% -
Stevens County25,0779.1%18.1% -
Sumner County222k8.3%16.8%52.2
Wabaunsee County27,0577.3%14.2%47.5
Wilson County28,3829.6%17.7%52.6
Woodson County23,1159.4%16.6% -

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 Kansas

These 65 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