Radon in Kansas: radon map by county

EPA's Map of Radon Zones puts 65 of Kansas's 105 counties in Zone 1 (predicted average indoor radon above 4 pCi/L), 40 in Zone 2 and 0 in Zone 3.

counties in Zone 1 (above 4 pCi/L predicted)

counties in Zone 2 (2 to 4)

counties in Zone 3 (below 2)

n/a

of 0 lab tests at or above 4 pCi/L

Radon by county in Kansas

EPA radon zone and radon test results for each county in Kansas
County	EPA zone	Lab tests	Median	4+ pCi/L
Allen County	Zone 2	n/a	n/a	n/a
Anderson County	Zone 2	n/a	n/a	n/a
Atchison County	Zone 1	n/a	n/a	n/a
Barber County	Zone 2	n/a	n/a	n/a
Barton County	Zone 1	n/a	n/a	n/a
Bourbon County	Zone 2	n/a	n/a	n/a
Brown County	Zone 1	n/a	n/a	n/a
Butler County	Zone 2	n/a	n/a	n/a
Chase County	Zone 2	n/a	n/a	n/a
Chautauqua County	Zone 2	n/a	n/a	n/a
Cherokee County	Zone 2	n/a	n/a	n/a
Cheyenne County	Zone 1	n/a	n/a	n/a
Clark County	Zone 2	n/a	n/a	n/a
Clay County	Zone 1	n/a	n/a	n/a
Cloud County	Zone 1	n/a	n/a	n/a
Coffey County	Zone 2	n/a	n/a	n/a
Comanche County	Zone 2	n/a	n/a	n/a
Cowley County	Zone 2	n/a	n/a	n/a
Crawford County	Zone 2	n/a	n/a	n/a
Decatur County	Zone 1	n/a	n/a	n/a
Dickinson County	Zone 1	n/a	n/a	n/a
Doniphan County	Zone 2	n/a	n/a	n/a
Douglas County	Zone 1	n/a	n/a	n/a
Edwards County	Zone 2	n/a	n/a	n/a
Elk County	Zone 2	n/a	n/a	n/a
Ellis County	Zone 1	n/a	n/a	n/a
Ellsworth County	Zone 1	n/a	n/a	n/a
Finney County	Zone 1	n/a	n/a	n/a
Ford County	Zone 1	n/a	n/a	n/a
Franklin County	Zone 2	n/a	n/a	n/a
Geary County	Zone 1	n/a	n/a	n/a
Gove County	Zone 1	n/a	n/a	n/a
Graham County	Zone 1	n/a	n/a	n/a
Grant County	Zone 1	n/a	n/a	n/a
Gray County	Zone 1	n/a	n/a	n/a
Greeley County	Zone 1	n/a	n/a	n/a
Greenwood County	Zone 2	n/a	n/a	n/a
Hamilton County	Zone 1	n/a	n/a	n/a
Harper County	Zone 2	n/a	n/a	n/a
Harvey County	Zone 2	n/a	n/a	n/a
Haskell County	Zone 1	n/a	n/a	n/a
Hodgeman County	Zone 1	n/a	n/a	n/a
Jackson County	Zone 1	n/a	n/a	n/a
Jefferson County	Zone 2	n/a	n/a	n/a
Jewell County	Zone 1	n/a	n/a	n/a
Johnson County	Zone 1	n/a	n/a	n/a
Kearny County	Zone 1	n/a	n/a	n/a
Kingman County	Zone 1	n/a	n/a	n/a
Kiowa County	Zone 1	n/a	n/a	n/a
Labette County	Zone 2	n/a	n/a	n/a
Lane County	Zone 1	n/a	n/a	n/a
Leavenworth County	Zone 1	n/a	n/a	n/a
Lincoln County	Zone 1	n/a	n/a	n/a
Linn County	Zone 2	n/a	n/a	n/a
Logan County	Zone 1	n/a	n/a	n/a
Lyon County	Zone 2	n/a	n/a	n/a
Marion County	Zone 1	n/a	n/a	n/a
Marshall County	Zone 1	n/a	n/a	n/a
McPherson County	Zone 1	n/a	n/a	n/a
Meade County	Zone 1	n/a	n/a	n/a
Miami County	Zone 2	n/a	n/a	n/a
Mitchell County	Zone 1	n/a	n/a	n/a
Montgomery County	Zone 2	n/a	n/a	n/a
Morris County	Zone 2	n/a	n/a	n/a
Morton County	Zone 2	n/a	n/a	n/a
Nemaha County	Zone 1	n/a	n/a	n/a
Neosho County	Zone 2	n/a	n/a	n/a
Ness County	Zone 1	n/a	n/a	n/a
Norton County	Zone 1	n/a	n/a	n/a
Osage County	Zone 2	n/a	n/a	n/a
Osborne County	Zone 1	n/a	n/a	n/a
Ottawa County	Zone 1	n/a	n/a	n/a
Pawnee County	Zone 1	n/a	n/a	n/a
Phillips County	Zone 1	n/a	n/a	n/a
Pottawatomie County	Zone 1	n/a	n/a	n/a
Pratt County	Zone 1	n/a	n/a	n/a
Rawlins County	Zone 1	n/a	n/a	n/a
Reno County	Zone 2	n/a	n/a	n/a
Republic County	Zone 1	n/a	n/a	n/a
Rice County	Zone 1	n/a	n/a	n/a
Riley County	Zone 1	n/a	n/a	n/a
Rooks County	Zone 1	n/a	n/a	n/a
Rush County	Zone 1	n/a	n/a	n/a
Russell County	Zone 1	n/a	n/a	n/a
Saline County	Zone 1	n/a	n/a	n/a
Scott County	Zone 1	n/a	n/a	n/a
Sedgwick County	Zone 2	n/a	n/a	n/a
Seward County	Zone 2	n/a	n/a	n/a
Shawnee County	Zone 2	n/a	n/a	n/a
Sheridan County	Zone 1	n/a	n/a	n/a
Sherman County	Zone 1	n/a	n/a	n/a
Smith County	Zone 1	n/a	n/a	n/a
Stafford County	Zone 2	n/a	n/a	n/a
Stanton County	Zone 1	n/a	n/a	n/a
Stevens County	Zone 2	n/a	n/a	n/a
Sumner County	Zone 2	n/a	n/a	n/a
Thomas County	Zone 1	n/a	n/a	n/a
Trego County	Zone 1	n/a	n/a	n/a
Wabaunsee County	Zone 2	n/a	n/a	n/a
Wallace County	Zone 1	n/a	n/a	n/a
Washington County	Zone 1	n/a	n/a	n/a
Wichita County	Zone 1	n/a	n/a	n/a
Wilson County	Zone 2	n/a	n/a	n/a
Woodson County	Zone 2	n/a	n/a	n/a
Wyandotte County	Zone 1	n/a	n/a	n/a

Lab tests: buildings tested by radon laboratories, 2008 to 2017; median in pCi/L; “4+ pCi/L” is the share of tests at or above EPA's action level. n/a: no value on file (no tests, or too few to report).

What the zones mean

Zone 1 counties have a predicted average indoor radon screening level above 4 pCi/L, Zone 2 from 2 to 4 pCi/L and Zone 3 below 2 pCi/L. The prediction is from 1993 indoor measurements, geology, aerial radioactivity, soils and foundation types. EPA: “This map should not be used to determine if individual homes need to be tested.” EPA recommends fixing a home at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, because there is no known safe level of exposure.

Radon in Kansas: questions

What radon zone is Kansas?

EPA's 1993 map does not give states one zone; it zones each county. In Kansas, 65 counties are Zone 1, 40 Zone 2 and 0 Zone 3. EPA says the map "should not be used to determine if individual homes need to be tested".

Does Kansas publish its own radon test data?

Kansas's radon program reports county test results; the latest year with county results is 2022, shown on each county page.

Should I test for radon in Kansas?

Yes. EPA recommends testing every home no matter where it is, fixing it at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, because there is no known safe level of radon exposure.

States bordering Kansas

Radon in Colorado (53 of 64 in Zone 1)Radon in Missouri (11 of 115 in Zone 1)Radon in Nebraska (53 of 93 in Zone 1)Radon in Oklahoma (0 of 77 in Zone 1)

Other free hazard lookups

All of these, plus wetlands, FEMA hazard ratings and the federal contamination lists, are in the Environmental Records Report for any US address ($29).

Superfund sites in Kansas · Radon map of every state

Data compiled 2026-10-20. County-level screening information, not a radon measurement of any building.