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Kansas Radon Map and Levels by County

Kansas's counties span EPA Zones 1 and 2. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Share at 4+ pCi/L

    31.8%

    7.4 pts above U.S.

    Kansas
    31.8%
    U.S.
    24.4%

    69,909 tests across 96 counties, 2021

  • Rank among states

    8 of 16

    Ten highest states

    Kansas
    31.8%
    Colorado
    47.3%

    By share, every state pooled the same way, 2021

  • Counties in EPA Zone 1

    65 of 105

    Most at highest potential

    Zone 1
    65
    Zone 2
    40

    Most counties sit in Zone 1; Zone 1 is the highest potential

  • Highest county

    93.8%

    Norton County

    Norton
    93.8%
    Doniphan
    0.0%

    Counties with 30+ tests, 2021

Read a result for Kansas

Starts at EPA's action level

4.0pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 4.0 pCi/L

At or above 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. 31.8% of Kansas's reported tests reached 4 pCi/L, 2021.

Interpret this readingWhat a fix costs

The data

Kansas, At a glance

Kansas at a glance

Predicted: EPA radon zone

105 of 105 counties classified

EPA classifies counties, not states. Of the 105 counties in Kansas with a zone, 65 are in Zone 1 and 40 in Zone 2.

  • Zone 1: Highest predicted potentialgreater than 4 pCi/L65 of 105 counties · 61.9%
  • Zone 2: Moderate predicted potential2 to 4 pCi/L40 of 105 counties · 38.1%

An EPA radon zone predicts a whole county. It is not intended to determine whether any individual home should be tested: homes with elevated levels occur in all three zones, and EPA recommends testing every home regardless of zone.

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

CDC test figures, county by county

CDC publishes Kansas's radon test figures by county: 104 of its 105 counties have one. Each one's share is in the county list.

How to read these figures

Kansas, Compared

Kansas radon figures, compared

Calculated by Radon411
Kansas, 2021
31.8%
of 69,909 tests at or above 4 pCi/L, pooled
Against the U.S.
+7.4points
24.4% pooled
Rank among the states
8 of 16
1 is the highest share
Counties with 30 or more tests
62
Highest
93.8%
Norton County
Lowest
0.0%
Doniphan County

Kansas pools to 31.8%: that share of 69,909 reported tests from 96 counties in 2021 reached EPA's action level. Nationally the pooled share is 24.4%: 7.4 points lower than here.

Among 16 states pooled the same way it ranks 8th, with Missouri (31.8%) above it and Vermont (19.2%) below. Norton County reports the highest share (93.8% of 48 tests) and Doniphan County the lowest (0.0%); the most tests came from Johnson County, 25,860 of them at 39.6%.

Year by year (7 years pooled), the share went from 35.4% (2016) to 32.0% (2022), down 3.4 points, with 2018 the highest at 37.3%. By band, 20 counties at 50% or more, 25 counties at 30% to 50%, 14 counties at 15% to 30%, 1 county at 5% to 15%, 2 counties at under 5%.

EPA's 1993 map puts 65 of its 105 classified counties in Zone 1; the tests reported since bear that out at 31.8%.

Kansas ranked among 16 states by pooled share of tests at or above 4 pCi/L, 2021
StateRankCountiesTestsAt or above 4 pCi/L
Wisconsin3 of 167211,73839.9%
Nebraska4 of 168338,37034.9%
Utah5 of 16275,30434.2%
Minnesota6 of 168729,29133.1%
Missouri7 of 16821,65831.8%
Kansas8 of 169669,90931.8%
Vermont9 of 16142,14419.2%
New York10 of 164957018.9%
Alaska11 of 161329818.8%
Oregon12 of 16334,46316.3%
Florida13 of 165516,06615.4%
Kansas' highest and lowest counties with 30 or more tests, by share at or above 4 pCi/L, 2021
CountyRankTestsAt or above 4 pCi/L
Norton County1 of 624893.8%
Decatur County2 of 624586.7%
Phillips County3 of 623372.7%
Marshall County4 of 629963.6%
Lincoln County5 of 623363.6%
Sherman County6 of 6210861.1%
Cloud County7 of 6226460.2%
Ford County8 of 6222857.9%
Republic County9 of 624257.1%
Pawnee County10 of 629656.3%
Doniphan County62 of 62330.0%
Kingman County61 of 62873.4%
Labette County60 of 624513.3%
Jackson County59 of 625715.8%
Sedgwick County58 of 6216,65015.9%
Kansas' counties with 30 or more tests, by their own share at or above 4 pCi/L, 2021
ShareCountiesTheir testsFor example
50% or more202,025Norton County, Decatur County, Phillips County
30% to 50%2542,246Jefferson County, Atchison County, McPherson County
15% to 30%1425,029Geary County, Pratt County, Brown County
5% to 15%145Labette County
Under 5%2120Kingman County, Doniphan County
Kansas pooled by year, against the United States
YearCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
20229618,38532.0%23.9%+0.3 points
20219669,90931.8%24.4%+0.5 points
20209822,88331.3%25.5%−2.4 points
201910224,17633.7%29.0%−3.7 points
20189823,11237.3%29.1%Level
20179723,90237.3%31.7%+1.9 points
20169917,39435.4%31.2%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period. CDC publishes no state or national figure.

Kansas, Counties

Kansas counties by EPA zone

Predicted

Kansas's radon map, then all 105 counties by EPA's zone, the highest reported share of tests at or above 4 pCi/L first; each has its own report.

Kansas radon map by county: EPA radon zones. Map of Kansas's 105 counties shaded by EPA radon zone: Zone 1 in red-orange, Zone 2 in amber. 65 in Zone 1, 40 in Zone 2, 0 in Zone 3.
Kansas radon map by countyEPA radon zones for Kansas's counties: 65 counties in Zone 1, 40 counties in Zone 2, 0 counties in Zone 3.A prediction for each county, not a reading of any home; elevated homes occur in all three zones.

The 12 highest in Kansas, 2021

Zone 1: highest predicted potential65

Local help

Kansas, Local resources

Local resources in Kansas

Who to ask in Kansas: its radon program, test kits and professionals.

What Kansas's program says
Phone
(800) 693-5343

What it means

Kansas, Questions

Questions about radon in Kansas

Is radon a problem in Kansas?

EPA's Map of Radon Zones places 65 of the 105 Kansas counties it classifies in Zone 1, the highest predicted potential, 40 in Zone 2 and 0 in Zone 3. Pooled from 96 counties, 31.8% of the 69,909 radon tests reported to CDC in 2021 were at or above 4 pCi/L, 8th of 16 states.

Which Kansas counties are in EPA radon Zone 1?

65 counties are in Zone 1: Atchison County, Barton County, Brown County, Cheyenne County, Clay County, Cloud County, Decatur County, Dickinson County, and 57 more in the county table on this page.

Who does radon mitigation in Kansas?

Radon411's Kansas directory lists 178 radon businesses for testing, mitigation or both, each with the licensing list it was read from.

Which Kansas counties have the highest radon?

By the share of reported tests at or above 4 pCi/L, 2021: Norton County 93.8% (48 tests), Decatur County 86.7% (45 tests), Phillips County 72.7% (33 tests), Marshall County 63.6% (99 tests), Lincoln County 63.6% (33 tests).

Which EPA region is Kansas in?

Kansas is in EPA Region 7: Midwest.

Products

Kansas, Products

Testing a home in Kansas

31.8% of the 69,909 tests reported to CDC for Kansas in 2021 reached 4 pCi/L: a short-term kit (2 to 90 days) gives a first answer in days, a long-term test the year-round average. A short-term kit (2 to 90 days) is the quick first check for a home in Kansas; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Kansas homes, compared

Explore

Cities in Kansas with their own page

Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.