Radon levels in Kansas: Moderate

The model predicts a population-weighted basement average of 2.6 pCi/L (model estimate) 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

Test Kansas - the EPA says "consider fixing" in this range

The predicted basement average here is 2.6 pCi/L, in the 2-4 pCi/L band where the EPA recommends considering mitigation. Plenty of individual homes in a moderate area test above 4. Start with a short-term test; if it comes back at 2 or higher, follow up with a long-term test or a continuous monitor.

Get a short-term test kit →Or track it with a continuous monitor

Monitor link goes to the Airthings store - use code RADONGRADE-10OFF at checkout for 10% off any Airthings monitor.

Already tested at 4 pCi/L or higher? Find a certified mitigation professional (EPA). A mitigation system typically runs $800-$2,500 installed.

Affiliate links: we may earn a commission from Airthings or Amazon at no extra cost to you.

What the data says about radon in Kansas

65 of Kansas's 105 counties are EPA Zone 1 (62%), 40 are Zone 2 and 0 are Zone 3 on the EPA's county-level map. Zone 1 - the highest-potential class, predicted screening average above 4 pCi/L - is the most common designation in Kansas. The zones were drawn once, from geology and the tests available in 1993, and the EPA itself notes that homes with elevated radon exist in all three zones.

Weighted by where people live, Kansas's predicted basement average is 2.6 pCi/L - 1.4× the US population-weighted average of 1.8 - which puts the state in the moderate range. Of the 105 counties with predictions, 25 are predicted at or above 4 pCi/L, 79 in the 2-4 band and 1 below 2. The highest predicted county is Jewell County at 4.7 pCi/L; the lowest is Sedgwick County at 1.8 - a 3.0 pCi/L spread that means a statewide average tells you little about any one county.

Nationally 4.2% of ZIPs are predicted at 4+ pCi/L and 48.7% at 2+; in Kansas it is 16.5% and 92.3% - above the national figures on both counts. With more than half of ZIPs above 2, a test is worth doing before any purchase or renovation here.

Kansas counties by predicted radon

Sorted highest to lowest predicted basement average (model estimate). 105 counties.

CountyPredicted basementUpstairsGradeEPA zoneZIPs
Jewell County4.7 pCi/L2.4HighEPA Zone 18
Mitchell County4.7 pCi/L2.6HighEPA Zone 14
Russell County4.6 pCi/L2.4HighEPA Zone 16
Smith County4.5 pCi/L2.5HighEPA Zone 17
Osborne County4.4 pCi/L2.3HighEPA Zone 16
Norton County4.4 pCi/L2.3HighEPA Zone 14
Cloud County4.4 pCi/L2.4HighEPA Zone 16
Republic County4.3 pCi/L2.2HighEPA Zone 18
Phillips County4.3 pCi/L2.4HighEPA Zone 17
Ellsworth County4.2 pCi/L2.3HighEPA Zone 16
Marshall County4.2 pCi/L2.3HighEPA Zone 111
Rush County4.2 pCi/L2.2HighEPA Zone 19
Sheridan County4.2 pCi/L2.4HighEPA Zone 12
Washington County4.2 pCi/L2.2HighEPA Zone 111
Ottawa County4.2 pCi/L2.4HighEPA Zone 15
Rooks County4.2 pCi/L2.4HighEPA Zone 15
Hodgeman County4.1 pCi/L2.3HighEPA Zone 12
Trego County4.1 pCi/L2.3HighEPA Zone 13
Decatur County4.1 pCi/L2.2HighEPA Zone 14
Gove County4.1 pCi/L2.3HighEPA Zone 15
Lane County4.1 pCi/L2.4HighEPA Zone 12
Rawlins County4.1 pCi/L2.3HighEPA Zone 14
Graham County4.0 pCi/L2.2HighEPA Zone 14
Logan County4.0 pCi/L2.4HighEPA Zone 13
Thomas County4.0 pCi/L2.2HighEPA Zone 15
Lincoln County4.0 pCi/L2.1ModerateEPA Zone 14
Ellis County4.0 pCi/L2.1ModerateEPA Zone 15
Wallace County4.0 pCi/L2.3ModerateEPA Zone 13
Scott County4.0 pCi/L2.3ModerateEPA Zone 11
Ness County3.9 pCi/L2.2ModerateEPA Zone 17
Dickinson County3.9 pCi/L2.4ModerateEPA Zone 16
Saline County3.8 pCi/L2.1ModerateEPA Zone 16
Sherman County3.8 pCi/L2.2ModerateEPA Zone 13
Rice County3.8 pCi/L2.0ModerateEPA Zone 17
Nemaha County3.7 pCi/L2.2ModerateEPA Zone 19
Wichita County3.7 pCi/L2.1ModerateEPA Zone 12
Gray County3.6 pCi/L2.1ModerateEPA Zone 14
Greeley County3.6 pCi/L2.1ModerateEPA Zone 11
Meade County3.6 pCi/L2.1ModerateEPA Zone 13
McPherson County3.6 pCi/L1.6ModerateEPA Zone 18
Haskell County3.6 pCi/L2.0ModerateEPA Zone 13
Cheyenne County3.5 pCi/L2.1ModerateEPA Zone 12
Doniphan County3.5 pCi/L2.1ModerateEPA Zone 25
Kearny County3.4 pCi/L2.0ModerateEPA Zone 12
Stanton County3.4 pCi/L1.9ModerateEPA Zone 12
Clay County3.3 pCi/L1.6ModerateEPA Zone 15
Grant County3.3 pCi/L1.9ModerateEPA Zone 11
Pratt County3.3 pCi/L1.9ModerateEPA Zone 15
Brown County3.2 pCi/L2.0ModerateEPA Zone 18
Pawnee County3.2 pCi/L1.6ModerateEPA Zone 15
Clark County3.2 pCi/L1.8ModerateEPA Zone 23
Comanche County3.2 pCi/L1.7ModerateEPA Zone 23
Atchison County3.1 pCi/L1.9ModerateEPA Zone 15
Ford County3.1 pCi/L1.6ModerateEPA Zone 15
Geary County3.0 pCi/L1.7ModerateEPA Zone 12
Barton County3.0 pCi/L1.7ModerateEPA Zone 15
Riley County2.9 pCi/L1.9ModerateEPA Zone 17
Pottawatomie County2.9 pCi/L1.8ModerateEPA Zone 19
Edwards County2.9 pCi/L1.5ModerateEPA Zone 24
Miami County2.9 pCi/L1.6ModerateEPA Zone 26
Morris County2.8 pCi/L1.7ModerateEPA Zone 26
Cowley County2.8 pCi/L1.5ModerateEPA Zone 28
Lyon County2.7 pCi/L1.6ModerateEPA Zone 28
Wabaunsee County2.7 pCi/L1.5ModerateEPA Zone 26
Kiowa County2.7 pCi/L1.4ModerateEPA Zone 14
Hamilton County2.6 pCi/L1.5ModerateEPA Zone 12
Jackson County2.6 pCi/L1.6ModerateEPA Zone 19
Marion County2.6 pCi/L1.5ModerateEPA Zone 111
Harvey County2.6 pCi/L1.4ModerateEPA Zone 27
Johnson County2.6 pCi/L1.8ModerateEPA Zone 130
Wyandotte County2.5 pCi/L1.6ModerateEPA Zone 19
Stafford County2.5 pCi/L1.2ModerateEPA Zone 24
Finney County2.5 pCi/L1.4ModerateEPA Zone 13
Barber County2.5 pCi/L1.2ModerateEPA Zone 27
Franklin County2.5 pCi/L1.4ModerateEPA Zone 28
Osage County2.5 pCi/L1.4ModerateEPA Zone 29
Seward County2.4 pCi/L0.9ModerateEPA Zone 22
Kingman County2.4 pCi/L1.2ModerateEPA Zone 17
Leavenworth County2.4 pCi/L1.8ModerateEPA Zone 17
Coffey County2.4 pCi/L1.3ModerateEPA Zone 25
Jefferson County2.4 pCi/L1.4ModerateEPA Zone 29
Stevens County2.4 pCi/L1.1ModerateEPA Zone 22
Sumner County2.4 pCi/L1.3ModerateEPA Zone 213
Allen County2.4 pCi/L1.4ModerateEPA Zone 26
Labette County2.4 pCi/L1.3ModerateEPA Zone 27
Wilson County2.4 pCi/L1.3ModerateEPA Zone 25
Morton County2.4 pCi/L1.2ModerateEPA Zone 23
Neosho County2.4 pCi/L1.3ModerateEPA Zone 26
Bourbon County2.4 pCi/L1.6ModerateEPA Zone 27
Harper County2.4 pCi/L1.2ModerateEPA Zone 27
Woodson County2.4 pCi/L1.2ModerateEPA Zone 23
Chase County2.3 pCi/L1.3ModerateEPA Zone 25
Greenwood County2.3 pCi/L1.3ModerateEPA Zone 28
Reno County2.3 pCi/L1.2ModerateEPA Zone 213
Linn County2.3 pCi/L1.3ModerateEPA Zone 27
Anderson County2.3 pCi/L1.4ModerateEPA Zone 26
Shawnee County2.3 pCi/L1.4ModerateEPA Zone 222
Butler County2.3 pCi/L1.4ModerateEPA Zone 215
Crawford County2.2 pCi/L1.2ModerateEPA Zone 212
Elk County2.2 pCi/L1.2ModerateEPA Zone 25
Montgomery County2.2 pCi/L1.2ModerateEPA Zone 27
Cherokee County2.2 pCi/L1.1ModerateEPA Zone 27
Douglas County2.1 pCi/L1.3ModerateEPA Zone 17
Chautauqua County2.1 pCi/L1.1ModerateEPA Zone 24
Sedgwick County1.8 pCi/L1.1LowEPA Zone 240

Radon levels in Kansas cities

The 10 most-populous Kansas places among the 1,000 largest US cities (Census incorporated places and CDPs), by population. City figures are ZIP-land-weighted means of the model's ZIP predictions (model estimate).

CityPopulationPredicted basementUpstairsGradeZIPs ≥ 4
Wichita396,1191.7 pCi/L1.1Low0%
Overland Park197,0892.5 pCi/L1.8Moderate0%
Kansas City152,9332.6 pCi/L1.7Moderate0%
Olathe147,4612.9 pCi/L1.9Moderate0%
Topeka125,4752.2 pCi/L1.4Moderate0%
Lawrence96,2072.1 pCi/L1.3Moderate0%
Shawnee69,4172.3 pCi/L1.7Moderate0%
Lenexa58,5362.4 pCi/L1.7Moderate0%
Manhattan53,6823.0 pCi/L2.0Moderate0%
Salina45,7923.8 pCi/L2.1Moderate0%

Highest-radon ZIP codes in Kansas

The 10 Kansas ZIP codes with the highest predicted basement average (model estimate), out of 671 modeled. A ZIP average is still an area figure - neighboring homes routinely test several pCi/L apart.

ZIPCountyPredicted basementUpstairsGrade
66956Jewell County5.7 pCi/L2.8High
66968Washington County5.0 pCi/L2.5High
66508Marshall County4.8 pCi/L2.4High
67420Mitchell County4.8 pCi/L2.7High
66949Jewell County4.8 pCi/L2.3High
67665Russell County4.7 pCi/L2.5High
67544Barton County4.7 pCi/L2.4High
66967Smith County4.7 pCi/L2.8High
66953Washington County4.6 pCi/L2.5High
66962Washington County4.6 pCi/L2.4High

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 area figures; 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

State programs keep lists of certified testers and mitigators and sometimes run kit programs. We link only pages we could verify, and Kansas's program page did not respond when we checked, so start from the EPA state radon contacts page. Then read how to test and what mitigation costs.