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Radon Levels in Wabaunsee County, Kansas

EPA puts Wabaunsee County in Zone 2, its middle radon zone, and 29.0% of its 31 reported radon tests (2022) were at or above 4 pCi/L. 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

    29.0%

    3.0 pts below KS

    Wabaunsee
    29.0%
    Kansas
    32.0%

    31 tests, 2022

  • Median result

    2.2pCi/L

    Below action level

    Wabaunsee
    2.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2022

  • Tests reported

    31

    38th of 38 by tests

    Wabaunsee
    31
    Johnson
    5,240

    Reported to CDC before any fix, 2022

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Kansas

    26 of 38

    Middle half

    Wabaunsee
    29.0%
    Mitchell
    57.4%

    By share, of 38 with 30+ tests

Read a result for Wabaunsee County

Starts at Wabaunsee County's median, 2.2 pCi/L

2.2pCi/L

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

EPA’s reading of 2.2 pCi/L

Between 2 and 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 between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Wabaunsee County's median reported result, 2022.

Interpret this readingWhat a fix costs

The data

Wabaunsee County, At a glance

Wabaunsee County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Wabaunsee County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: Moderate across 62% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Wabaunsee County, 2022

Share of reported tests at or above 4 pCi/L, by year, Wabaunsee County
Share of reported tests at or above 4 pCi/L, by year, Wabaunsee County
YearShare of reported tests at or above 4 pCi/L
201633.3%
201748.3%
201836.8%
201925.0%
202037.9%
202141.2%
202229.0%

2022: 29.0%. Across these years the share ran from 25.0% to 48.3%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 31 tests reported to CDC for Wabaunsee County over 2022, many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2022. Measured data period: 2016 to 2022 (every CDC figure on file).

How to read these figures

Wabaunsee County, Compared

Wabaunsee County radon figures, compared

Calculated by Radon411

Wabaunsee County's 31 reported tests in 2022 had a middle value of 2.2 pCi/L and a maximum of 11.3 pCi/L, and 29.0% reached 4 pCi/L. Kansas as a whole (96 Kansas counties, pooled) comes to 32.0%: 3.0 points higher than here.

Among its state's counties it ranks 26th of 38 Kansas counties with 30 or more tests for the same period. Statewide for the same period, Mitchell County reported the highest share (57.4%) and Crawford County the lowest (5.9%).

Below the action level, 15 tests (48.4%) came in under 2 pCi/L, against 45.8% statewide, and 7 tests (22.6%) fell between 2 and 4, against 22.1% statewide. The busiest year on file was 2021, with 102 tests reported; the quietest, 2019, had 24.

EPA's 1993 zone map puts Wabaunsee County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 62% of the county's land moderate radon potential.

Next door, the shares run from 25.2% in Pottawatomie County to 34.5% in Shawnee County, with Geary County and Pottawatomie County below Wabaunsee County. Over 3 years of annual figures the share fell 7.8 points, from 36.8% in 2018 to 29.0% in 2022; its peak was 41.2% in 2021.

Share of reported tests at or above 4 pCi/L by year, Wabaunsee County against Kansas2018 to 2022, years with 30 or more tests: Wabaunsee County 36.8% to 29.0%, the state's pooled share 32.0% in 2022.
Wabaunsee CountyKansas, pooled
Share of reported tests at or above 4 pCi/L by year, Wabaunsee County against Kansas: data table
YearTestsWabaunsee County, at or above 4 pCi/LKansas, pooled
20183836.8%37.3%
202110241.2%31.8%
20223129.0%32.0%
Wabaunsee County against Kansas, the United States and nearby counties, 2022
AreaTestsAt or above 4 pCi/LMedianDifference from Wabaunsee County
Wabaunsee County3129.0%2.2 pCi/LThis county
Kansas, pooled96 counties, pooled18,38532.0%Not pooled+3.0 points
United States, pooled853 counties, pooled333,14023.9%Not pooled−5.1 points
Mitchell Countyhighest in the state4757.4%6.2 pCi/L+28.4 points
Crawford Countylowest in the state345.9%0.8 pCi/L−23.1 points
Morris County, KSborders it2343.5%3.5 pCi/L+14.5 points
Osage County, KSborders it2642.3%3.5 pCi/L+13.3 points
Shawnee County, KSborders it38834.5%2.6 pCi/L+5.5 points
Lyon County, KSborders it4731.9%2.5 pCi/L+2.9 points
Riley County, KSborders it80031.3%1.9 pCi/L+2.3 points
Geary County, KSborders it36525.2%1.9 pCi/L−3.8 points
Pottawatomie County, KSborders it20625.2%1.7 pCi/L−3.8 points
Where Wabaunsee County's reported results fell, 2022, beside Kansas and the United States
ResultWabaunsee County testsWabaunsee County shareKansas shareU.S. shareAgainst Kansas
Under 2 pCi/L1548.4%45.8%54.5%+2.6 points
2 to 4 pCi/L722.6%22.1%21.7%+0.5 points
4 pCi/L and above929.0%32.0%23.9%−3.0 points
Wabaunsee County ranked among the 38 Kansas counties with 30 or more tests, by share at or above 4 pCi/L, 2022
CountyRankTestsAt or above 4 pCi/LMedian
Marshall County21 of 386631.8%1.9 pCi/L
Riley County22 of 3880031.3%1.9 pCi/L
Ellis County23 of 3819129.8%2.6 pCi/L
Wyandotte County24 of 3868729.7%2.1 pCi/L
Sumner County25 of 387929.1%2.3 pCi/L
Wabaunsee County26 of 383129.0%2.2 pCi/L
Rice County27 of 385328.3%1.8 pCi/L
Leavenworth County28 of 3851526.8%1.9 pCi/L
Douglas County29 of 3886825.8%1.8 pCi/L
Butler County30 of 3855025.5%2.1 pCi/L
Reno County31 of 3824025.4%2.2 pCi/L
Wabaunsee County radon tests by year, against Kansas' pooled share
YearTestsAt or above 4 pCi/LMedianHighestKansas, pooledChange from the row before
20223129.0%2.2 pCi/L11.3 pCi/L32.0%−12.2 points
202110241.2%3.3 pCi/L15.7 pCi/L31.8%+3.3 points
20202937.9%2.9 pCi/L23.4 pCi/L31.3%+12.9 points
20192425.0%2.7 pCi/L18.5 pCi/L33.7%−11.8 points
20183836.8%2.6 pCi/L30.1 pCi/L37.3%−11.5 points
20172948.3%3.7 pCi/L29.8 pCi/L37.3%+15.0 points
20162733.3%3.3 pCi/L26.9 pCi/L35.4%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Wabaunsee County, Geology

The ground under Wabaunsee County

Predicted

USGS's geologic map splits Wabaunsee County: 62.4% of its land is moderate radon potential and 37.6% high. The map puts 62.4% of Wabaunsee County in the area it calls Glaciated Area and 37.6% in Glacial Drift. USGS gives the first a radon index of 9, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).

USGS's geologic areas under Wabaunsee County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Glaciated AreaGlacial till underlain by Pennsylvanian and Permian marine and nonmarine sedimentary shale, sandstone, limestone, coal.Moderate962.4%
Glacial DriftGlacial drift and loess of varying thickness, largely locally derived from underlying and nearby Paleozoic sedimentary rocks.High1237.6%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Wabaunsee County beside the ground around it

Kansas as a whole has more high-potential ground than Wabaunsee County: 59.9% of its land, against 37.6% here. Of the 7 counties that border it, 3 have more high-potential ground, Riley County the most at 100%.

Share of land by USGS radon potential: Wabaunsee County, the 7 counties bordering it and Kansas
AreaEPA zoneLow potentialModerate potentialHigh potential
Wabaunsee CountyZone 2None62.4%37.6%
Shawnee CountyZone 2None79.3%20.7%
Geary CountyZone 1None12.8%87.2%
Pottawatomie CountyZone 1None34.7%65.3%
Morris CountyZone 2None80.0%20.0%
Lyon CountyZone 2None100%None
Osage CountyZone 2None100%None
Riley CountyZone 1NoneNone100%
Kansas105 counties, pooled by land areaVariesNone40.1%59.9%

The map rates the ground, not the air in any home.

Local help

Wabaunsee County, Local resources

Radon testing and mitigation in Wabaunsee County

Listed radon professionals by town: Wamego

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

What it means

Wabaunsee County, Questions

Questions about radon in Wabaunsee County

Are radon levels high in Wabaunsee County?

In 2022, 29.0% of the radon tests reported to CDC for Wabaunsee County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.2 pCi/L. Of 38 Kansas counties with 30 or more tests for the same period, 25 reported a higher share; pooled, the state comes to 32.0%.

Which counties border Wabaunsee County?

Wabaunsee County borders 7 counties: Shawnee County, Geary County, Pottawatomie County, Morris County, Lyon County, Osage County and Riley County.

Products

Wabaunsee County, Products

Testing a home in Wabaunsee County

In Wabaunsee County, 29.0% of 31 tests reported to CDC in 2022 reached 4 pCi/L, against 32.0% pooled across Kansas. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Wabaunsee County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Wabaunsee County homes, compared

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Wabaunsee County, Bordering counties

Counties bordering Wabaunsee County

Calculated by Radon411

Wabaunsee County, Cities and towns

Cities and towns in Wabaunsee County

The Census Bureau estimates 7,018 residents in Wabaunsee County for July 1, 2025, 123 more than in 2020 (+1.8%). Spread over its land, that is 8.8 people to the square mile. Wamego, the largest place on its list (4,912 residents in all), extends beyond Wabaunsee County, so no share of the total is worked out for it. CDC's 31 reported tests for 2022 work out to 4.4 per 1,000 residents (2025 estimate), close to Kansas' 6.2.

From Wamego to Willard, CDC publishes no figure by town: each reads Wabaunsee County's.

The cities and towns in Wabaunsee County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Wamegoextends beyond Wabaunsee County4,912+1.5%Counted whole
St. Marysextends beyond Wabaunsee County2,790+1.2%Counted whole
Alma830+2.9%11.8%
Maple Hill628−0.3%8.9%
Eskridge427−1.6%6.1%
Alta Vista401−2.2%5.7%
McFarland274−1.4%3.9%
Paxico203−2.4%2.9%
Harveyville172−2.3%2.5%
Willardextends beyond Wabaunsee County68+1.5%Counted whole

10 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Wabaunsee County is counted whole, so it has no share.

Wabaunsee County, Homes

Homes in Wabaunsee County

Wabaunsee County is a place of houses on their own lots: 86% of its 3,135 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1966 (1975 for Kansas), and 45% date from before 1960. Owners live in 80% of the occupied homes (Kansas: 67%), so for most households a test and a fix are their own to order.

Homes in Wabaunsee County, Kansas, 2019 to 2023
HomesWabaunsee CountyKansas
Housing units3,1351,285,221
Detached houses86%72%
In buildings of 5 or more2%13%
Mobile homes5%4%
Built before 196045%33%
Built since 200019%20%
Middle year built19661975
Owner-occupied80%67%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.