Radon levels in Kansas: Moderate
The model predicts a population-weighted basement average of 2.6 pCi/L across Kansas's 105 counties - about 1.4× the US average of 1.8 pCi/L. Above-ground floors average 1.6 pCi/L.
Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.
65 / 105
EPA Zone 1 counties (62%)
40 / 0
Zone 2 / Zone 3 counties
25
counties predicted ≥ 4 pCi/L
16.5%
of ZIP codes predicted ≥ 4 pCi/L
Kansas counties by predicted radon
Sorted highest to lowest predicted basement average. 105 counties.
| County | Predicted basement | Upstairs | Grade | EPA zone | ZIPs |
|---|---|---|---|---|---|
| Jewell County | 4.7 pCi/L | 2.4 | High | EPA Zone 1 | 8 |
| Mitchell County | 4.7 pCi/L | 2.6 | High | EPA Zone 1 | 4 |
| Russell County | 4.6 pCi/L | 2.4 | High | EPA Zone 1 | 6 |
| Smith County | 4.5 pCi/L | 2.5 | High | EPA Zone 1 | 7 |
| Osborne County | 4.4 pCi/L | 2.3 | High | EPA Zone 1 | 6 |
| Norton County | 4.4 pCi/L | 2.3 | High | EPA Zone 1 | 4 |
| Cloud County | 4.4 pCi/L | 2.4 | High | EPA Zone 1 | 6 |
| Republic County | 4.3 pCi/L | 2.2 | High | EPA Zone 1 | 8 |
| Phillips County | 4.3 pCi/L | 2.4 | High | EPA Zone 1 | 7 |
| Ellsworth County | 4.2 pCi/L | 2.3 | High | EPA Zone 1 | 6 |
| Marshall County | 4.2 pCi/L | 2.3 | High | EPA Zone 1 | 11 |
| Rush County | 4.2 pCi/L | 2.2 | High | EPA Zone 1 | 9 |
| Sheridan County | 4.2 pCi/L | 2.4 | High | EPA Zone 1 | 2 |
| Washington County | 4.2 pCi/L | 2.2 | High | EPA Zone 1 | 11 |
| Ottawa County | 4.2 pCi/L | 2.4 | High | EPA Zone 1 | 5 |
| Rooks County | 4.2 pCi/L | 2.4 | High | EPA Zone 1 | 5 |
| Hodgeman County | 4.1 pCi/L | 2.3 | High | EPA Zone 1 | 2 |
| Trego County | 4.1 pCi/L | 2.3 | High | EPA Zone 1 | 3 |
| Decatur County | 4.1 pCi/L | 2.2 | High | EPA Zone 1 | 4 |
| Gove County | 4.1 pCi/L | 2.3 | High | EPA Zone 1 | 5 |
| Lane County | 4.1 pCi/L | 2.4 | High | EPA Zone 1 | 2 |
| Rawlins County | 4.1 pCi/L | 2.3 | High | EPA Zone 1 | 4 |
| Graham County | 4.0 pCi/L | 2.2 | High | EPA Zone 1 | 4 |
| Logan County | 4.0 pCi/L | 2.4 | High | EPA Zone 1 | 3 |
| Thomas County | 4.0 pCi/L | 2.2 | High | EPA Zone 1 | 5 |
| Lincoln County | 4.0 pCi/L | 2.1 | Moderate | EPA Zone 1 | 4 |
| Ellis County | 4.0 pCi/L | 2.1 | Moderate | EPA Zone 1 | 5 |
| Wallace County | 4.0 pCi/L | 2.3 | Moderate | EPA Zone 1 | 3 |
| Scott County | 4.0 pCi/L | 2.3 | Moderate | EPA Zone 1 | 1 |
| Ness County | 3.9 pCi/L | 2.2 | Moderate | EPA Zone 1 | 7 |
| Dickinson County | 3.9 pCi/L | 2.4 | Moderate | EPA Zone 1 | 6 |
| Saline County | 3.8 pCi/L | 2.1 | Moderate | EPA Zone 1 | 6 |
| Sherman County | 3.8 pCi/L | 2.2 | Moderate | EPA Zone 1 | 3 |
| Rice County | 3.8 pCi/L | 2.0 | Moderate | EPA Zone 1 | 7 |
| Nemaha County | 3.7 pCi/L | 2.2 | Moderate | EPA Zone 1 | 9 |
| Wichita County | 3.7 pCi/L | 2.1 | Moderate | EPA Zone 1 | 2 |
| Gray County | 3.6 pCi/L | 2.1 | Moderate | EPA Zone 1 | 4 |
| Greeley County | 3.6 pCi/L | 2.1 | Moderate | EPA Zone 1 | 1 |
| Meade County | 3.6 pCi/L | 2.1 | Moderate | EPA Zone 1 | 3 |
| McPherson County | 3.6 pCi/L | 1.6 | Moderate | EPA Zone 1 | 8 |
| Haskell County | 3.6 pCi/L | 2.0 | Moderate | EPA Zone 1 | 3 |
| Cheyenne County | 3.5 pCi/L | 2.1 | Moderate | EPA Zone 1 | 2 |
| Doniphan County | 3.5 pCi/L | 2.1 | Moderate | EPA Zone 2 | 5 |
| Kearny County | 3.4 pCi/L | 2.0 | Moderate | EPA Zone 1 | 2 |
| Stanton County | 3.4 pCi/L | 1.9 | Moderate | EPA Zone 1 | 2 |
| Clay County | 3.3 pCi/L | 1.6 | Moderate | EPA Zone 1 | 5 |
| Grant County | 3.3 pCi/L | 1.9 | Moderate | EPA Zone 1 | 1 |
| Pratt County | 3.3 pCi/L | 1.9 | Moderate | EPA Zone 1 | 5 |
| Brown County | 3.2 pCi/L | 2.0 | Moderate | EPA Zone 1 | 8 |
| Pawnee County | 3.2 pCi/L | 1.6 | Moderate | EPA Zone 1 | 5 |
| Clark County | 3.2 pCi/L | 1.8 | Moderate | EPA Zone 2 | 3 |
| Comanche County | 3.2 pCi/L | 1.7 | Moderate | EPA Zone 2 | 3 |
| Atchison County | 3.1 pCi/L | 1.9 | Moderate | EPA Zone 1 | 5 |
| Ford County | 3.1 pCi/L | 1.6 | Moderate | EPA Zone 1 | 5 |
| Geary County | 3.0 pCi/L | 1.7 | Moderate | EPA Zone 1 | 2 |
| Barton County | 3.0 pCi/L | 1.7 | Moderate | EPA Zone 1 | 5 |
| Riley County | 2.9 pCi/L | 1.9 | Moderate | EPA Zone 1 | 7 |
| Pottawatomie County | 2.9 pCi/L | 1.8 | Moderate | EPA Zone 1 | 9 |
| Edwards County | 2.9 pCi/L | 1.5 | Moderate | EPA Zone 2 | 4 |
| Miami County | 2.9 pCi/L | 1.6 | Moderate | EPA Zone 2 | 6 |
| Morris County | 2.8 pCi/L | 1.7 | Moderate | EPA Zone 2 | 6 |
| Cowley County | 2.8 pCi/L | 1.5 | Moderate | EPA Zone 2 | 8 |
| Lyon County | 2.7 pCi/L | 1.6 | Moderate | EPA Zone 2 | 8 |
| Wabaunsee County | 2.7 pCi/L | 1.5 | Moderate | EPA Zone 2 | 6 |
| Kiowa County | 2.7 pCi/L | 1.4 | Moderate | EPA Zone 1 | 4 |
| Hamilton County | 2.6 pCi/L | 1.5 | Moderate | EPA Zone 1 | 2 |
| Jackson County | 2.6 pCi/L | 1.6 | Moderate | EPA Zone 1 | 9 |
| Marion County | 2.6 pCi/L | 1.5 | Moderate | EPA Zone 1 | 11 |
| Harvey County | 2.6 pCi/L | 1.4 | Moderate | EPA Zone 2 | 7 |
| Johnson County | 2.6 pCi/L | 1.8 | Moderate | EPA Zone 1 | 30 |
| Wyandotte County | 2.5 pCi/L | 1.6 | Moderate | EPA Zone 1 | 9 |
| Stafford County | 2.5 pCi/L | 1.2 | Moderate | EPA Zone 2 | 4 |
| Finney County | 2.5 pCi/L | 1.4 | Moderate | EPA Zone 1 | 3 |
| Barber County | 2.5 pCi/L | 1.2 | Moderate | EPA Zone 2 | 7 |
| Franklin County | 2.5 pCi/L | 1.4 | Moderate | EPA Zone 2 | 8 |
| Osage County | 2.5 pCi/L | 1.4 | Moderate | EPA Zone 2 | 9 |
| Seward County | 2.4 pCi/L | 0.9 | Moderate | EPA Zone 2 | 2 |
| Kingman County | 2.4 pCi/L | 1.2 | Moderate | EPA Zone 1 | 7 |
| Leavenworth County | 2.4 pCi/L | 1.8 | Moderate | EPA Zone 1 | 7 |
| Coffey County | 2.4 pCi/L | 1.3 | Moderate | EPA Zone 2 | 5 |
| Jefferson County | 2.4 pCi/L | 1.4 | Moderate | EPA Zone 2 | 9 |
| Stevens County | 2.4 pCi/L | 1.1 | Moderate | EPA Zone 2 | 2 |
| Sumner County | 2.4 pCi/L | 1.3 | Moderate | EPA Zone 2 | 13 |
| Allen County | 2.4 pCi/L | 1.4 | Moderate | EPA Zone 2 | 6 |
| Labette County | 2.4 pCi/L | 1.3 | Moderate | EPA Zone 2 | 7 |
| Wilson County | 2.4 pCi/L | 1.3 | Moderate | EPA Zone 2 | 5 |
| Morton County | 2.4 pCi/L | 1.2 | Moderate | EPA Zone 2 | 3 |
| Neosho County | 2.4 pCi/L | 1.3 | Moderate | EPA Zone 2 | 6 |
| Bourbon County | 2.4 pCi/L | 1.6 | Moderate | EPA Zone 2 | 7 |
| Harper County | 2.4 pCi/L | 1.2 | Moderate | EPA Zone 2 | 7 |
| Woodson County | 2.4 pCi/L | 1.2 | Moderate | EPA Zone 2 | 3 |
| Chase County | 2.3 pCi/L | 1.3 | Moderate | EPA Zone 2 | 5 |
| Greenwood County | 2.3 pCi/L | 1.3 | Moderate | EPA Zone 2 | 8 |
| Reno County | 2.3 pCi/L | 1.2 | Moderate | EPA Zone 2 | 13 |
| Linn County | 2.3 pCi/L | 1.3 | Moderate | EPA Zone 2 | 7 |
| Anderson County | 2.3 pCi/L | 1.4 | Moderate | EPA Zone 2 | 6 |
| Shawnee County | 2.3 pCi/L | 1.4 | Moderate | EPA Zone 2 | 22 |
| Butler County | 2.3 pCi/L | 1.4 | Moderate | EPA Zone 2 | 15 |
| Crawford County | 2.2 pCi/L | 1.2 | Moderate | EPA Zone 2 | 12 |
| Elk County | 2.2 pCi/L | 1.2 | Moderate | EPA Zone 2 | 5 |
| Montgomery County | 2.2 pCi/L | 1.2 | Moderate | EPA Zone 2 | 7 |
| Cherokee County | 2.2 pCi/L | 1.1 | Moderate | EPA Zone 2 | 7 |
| Douglas County | 2.1 pCi/L | 1.3 | Moderate | EPA Zone 1 | 7 |
| Chautauqua County | 2.1 pCi/L | 1.1 | Moderate | EPA Zone 2 | 4 |
| Sedgwick County | 1.8 pCi/L | 1.1 | Low | EPA Zone 2 | 40 |
Kansas radon questions
- Is radon high in Kansas?
- Kansas's population-weighted predicted basement average is 2.6 pCi/L, about 1.4× the US average of 1.8. 25 of its 105 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 79 are in the 2-4 "consider fixing" range and 1 are below 2. 16.5% of Kansas ZIP codes are predicted at 4 or higher.
- Which Kansas county has the highest radon?
- Jewell County has the highest predicted basement average in Kansas at 4.7 pCi/L (EPA Zone 1). The lowest is Sedgwick County at 1.8 pCi/L. These are modeled area averages; individual homes in any county can test far higher.
- How many EPA Zone 1 counties are in Kansas?
- 65 of Kansas's 105 counties (62%) are EPA Zone 1 (highest potential), 40 are Zone 2 and 0 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.
- Should I test for radon in Kansas?
- Yes - with some urgency. Kansas's predicted average is in the moderate range, and 92.3% of its ZIP codes are predicted at 2 pCi/L or higher. A short-term charcoal kit or a continuous digital monitor will tell you your actual level within days.
Kansas radon program
Many states offer free or discounted test kits and keep lists of certified mitigators. Find the Kansas radon office through the EPA state radon contacts page. Then read how to test and what mitigation costs.