Kansas Radon Levels
65Zone 1 (High)
40Zone 2 (Moderate)
0Zone 3 (Low)
62% of counties in Kansas are classified as EPA Zone 1 (highest radon potential), meaning predicted average indoor radon levels exceed 4 pCi/L — the EPA action level. The EPA recommends that all homes be tested for radon, regardless of zone classification.
| County | EPA Zone | Risk Level |
|---|---|---|
| Allen County | Zone 2 | Moderate Potential |
| Anderson County | Zone 2 | Moderate Potential |
| Atchison County | Zone 1 | Highest Potential |
| Barber County | Zone 2 | Moderate Potential |
| Barton County | Zone 1 | Highest Potential |
| Bourbon County | Zone 2 | Moderate Potential |
| Brown County | Zone 1 | Highest Potential |
| Butler County | Zone 2 | Moderate Potential |
| Chase County | Zone 2 | Moderate Potential |
| Chautauqua County | Zone 2 | Moderate Potential |
| Cherokee County | Zone 2 | Moderate Potential |
| Cheyenne County | Zone 1 | Highest Potential |
| Clark County | Zone 2 | Moderate Potential |
| Clay County | Zone 1 | Highest Potential |
| Cloud County | Zone 1 | Highest Potential |
| Coffey County | Zone 2 | Moderate Potential |
| Comanche County | Zone 2 | Moderate Potential |
| Cowley County | Zone 2 | Moderate Potential |
| Crawford County | Zone 2 | Moderate Potential |
| Decatur County | Zone 1 | Highest Potential |
| Dickinson County | Zone 1 | Highest Potential |
| Doniphan County | Zone 2 | Moderate Potential |
| Douglas County | Zone 1 | Highest Potential |
| Edwards County | Zone 2 | Moderate Potential |
| Elk County | Zone 2 | Moderate Potential |
| Ellis County | Zone 1 | Highest Potential |
| Ellsworth County | Zone 1 | Highest Potential |
| Finney County | Zone 1 | Highest Potential |
| Ford County | Zone 1 | Highest Potential |
| Franklin County | Zone 2 | Moderate Potential |
| Geary County | Zone 1 | Highest Potential |
| Gove County | Zone 1 | Highest Potential |
| Graham County | Zone 1 | Highest Potential |
| Grant County | Zone 1 | Highest Potential |
| Gray County | Zone 1 | Highest Potential |
| Greeley County | Zone 1 | Highest Potential |
| Greenwood County | Zone 2 | Moderate Potential |
| Hamilton County | Zone 1 | Highest Potential |
| Harper County | Zone 2 | Moderate Potential |
| Harvey County | Zone 2 | Moderate Potential |
| Haskell County | Zone 1 | Highest Potential |
| Hodgeman County | Zone 1 | Highest Potential |
| Jackson County | Zone 1 | Highest Potential |
| Jefferson County | Zone 2 | Moderate Potential |
| Jewell County | Zone 1 | Highest Potential |
| Johnson County | Zone 1 | Highest Potential |
| Kearny County | Zone 1 | Highest Potential |
| Kingman County | Zone 1 | Highest Potential |
| Kiowa County | Zone 1 | Highest Potential |
| Labette County | Zone 2 | Moderate Potential |
| Lane County | Zone 1 | Highest Potential |
| Leavenworth County | Zone 1 | Highest Potential |
| Lincoln County | Zone 1 | Highest Potential |
| Linn County | Zone 2 | Moderate Potential |
| Logan County | Zone 1 | Highest Potential |
| Lyon County | Zone 2 | Moderate Potential |
| McPherson County | Zone 1 | Highest Potential |
| Marion County | Zone 1 | Highest Potential |
| Marshall County | Zone 1 | Highest Potential |
| Meade County | Zone 1 | Highest Potential |
| Miami County | Zone 2 | Moderate Potential |
| Mitchell County | Zone 1 | Highest Potential |
| Montgomery County | Zone 2 | Moderate Potential |
| Morris County | Zone 2 | Moderate Potential |
| Morton County | Zone 2 | Moderate Potential |
| Nemaha County | Zone 1 | Highest Potential |
| Neosho County | Zone 2 | Moderate Potential |
| Ness County | Zone 1 | Highest Potential |
| Norton County | Zone 1 | Highest Potential |
| Osage County | Zone 2 | Moderate Potential |
| Osborne County | Zone 1 | Highest Potential |
| Ottawa County | Zone 1 | Highest Potential |
| Pawnee County | Zone 1 | Highest Potential |
| Phillips County | Zone 1 | Highest Potential |
| Pottawatomie County | Zone 1 | Highest Potential |
| Pratt County | Zone 1 | Highest Potential |
| Rawlins County | Zone 1 | Highest Potential |
| Reno County | Zone 2 | Moderate Potential |
| Republic County | Zone 1 | Highest Potential |
| Rice County | Zone 1 | Highest Potential |
| Riley County | Zone 1 | Highest Potential |
| Rooks County | Zone 1 | Highest Potential |
| Rush County | Zone 1 | Highest Potential |
| Russell County | Zone 1 | Highest Potential |
| Saline County | Zone 1 | Highest Potential |
| Scott County | Zone 1 | Highest Potential |
| Sedgwick County | Zone 2 | Moderate Potential |
| Seward County | Zone 2 | Moderate Potential |
| Shawnee County | Zone 2 | Moderate Potential |
| Sheridan County | Zone 1 | Highest Potential |
| Sherman County | Zone 1 | Highest Potential |
| Smith County | Zone 1 | Highest Potential |
| Stafford County | Zone 2 | Moderate Potential |
| Stanton County | Zone 1 | Highest Potential |
| Stevens County | Zone 2 | Moderate Potential |
| Sumner County | Zone 2 | Moderate Potential |
| Thomas County | Zone 1 | Highest Potential |
| Trego County | Zone 1 | Highest Potential |
| Wabaunsee County | Zone 2 | Moderate Potential |
| Wallace County | Zone 1 | Highest Potential |
| Washington County | Zone 1 | Highest Potential |
| Wichita County | Zone 1 | Highest Potential |
| Wilson County | Zone 2 | Moderate Potential |
| Woodson County | Zone 2 | Moderate Potential |
| Wyandotte County | Zone 1 | Highest Potential |