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Radon Levels in Wyandotte County, Kansas

EPA puts Wyandotte County in Zone 1, its highest radon zone, and 29.7% of its 687 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

    29.7%

    2.3 pts below KS

    Wyandotte
    29.7%
    Kansas
    32.0%

    687 tests, 2022

  • Median result

    2.1pCi/L

    Below action level

    Wyandotte
    2.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2022

  • Tests reported

    687

    6th of 38 by tests

    Wyandotte
    687
    Johnson
    5,240

    Reported to CDC before any fix, 2022

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Kansas

    24 of 38

    Middle half

    Wyandotte
    29.7%
    Mitchell
    57.4%

    By share, of 38 with 30+ tests

Read a result for Wyandotte County

Starts at Wyandotte County's median, 2.1 pCi/L

2.1pCi/L

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

EPA’s reading of 2.1 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. Wyandotte County's median reported result, 2022.

Interpret this readingWhat a fix costs

The data

Wyandotte County, At a glance

Wyandotte County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Wyandotte County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Wyandotte County, 2022

Share of reported tests at or above 4 pCi/L, by year, Wyandotte County
Share of reported tests at or above 4 pCi/L, by year, Wyandotte County
YearShare of reported tests at or above 4 pCi/L
201641.6%
201735.9%
201830.2%
201932.7%
202034.5%
202135.8%
202229.7%

2022: 29.7%. Across these years the share ran from 29.7% to 41.6%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 687 tests reported to CDC for Wyandotte 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

Wyandotte County, Compared

Wyandotte County radon figures, compared

Calculated by Radon411

Wyandotte County's 687 reported tests in 2022 had a middle value of 2.1 pCi/L and a maximum of 35.2 pCi/L, and 29.7% reached 4 pCi/L. Kansas as a whole (96 Kansas counties, pooled) comes to 32.0%: 2.3 points higher than here.

Among its state's counties it ranks 24th 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, 326 tests (47.5%) came in under 2 pCi/L, against 45.8% statewide, and 157 tests (22.9%) fell between 2 and 4, against 22.1% statewide. The busiest year on file was 2021, with 2,643 tests reported; the quietest, 2016, had 394.

EPA's 1993 zone map puts Wyandotte County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.

Next door, the shares run from 26.8% in Leavenworth County to 54.6% in Jackson County, MO, with Leavenworth County below Wyandotte County. Over 7 years of annual figures the share fell 11.9 points, from 41.6% in 2016 to 29.7% in 2022; its peak was 41.6% in 2016.

CDC also counts 17 tests taken after mitigation in Wyandotte County for the same period: tests in homes where a fix was already in.

Share of reported tests at or above 4 pCi/L by year, Wyandotte County against Kansas2016 to 2022, years with 30 or more tests: Wyandotte County 41.6% to 29.7%, the state's pooled share 32.0% in 2022.
Wyandotte CountyKansas, pooled
Share of reported tests at or above 4 pCi/L by year, Wyandotte County against Kansas: data table
YearTestsWyandotte County, at or above 4 pCi/LKansas, pooled
201639441.6%35.4%
201776335.9%37.3%
201881030.2%37.3%
201997232.7%33.7%
202075634.5%31.3%
20212,64335.8%31.8%
202268729.7%32.0%
Wyandotte County against Kansas, the United States and nearby counties, 2022
AreaTestsAt or above 4 pCi/LMedianDifference from Wyandotte County
Wyandotte County68729.7%2.1 pCi/LThis county
Kansas, pooled96 counties, pooled18,38532.0%Not pooled+2.3 points
United States, pooled853 counties, pooled333,14023.9%Not pooled−5.8 points
Mitchell Countyhighest in the state4757.4%6.2 pCi/L+27.7 points
Crawford Countylowest in the state345.9%0.8 pCi/L−23.8 points
Jackson County, MOborders it35754.6%4.4 pCi/L+24.9 points
Clay County, MOborders it11151.4%4.2 pCi/L+21.7 points
Platte County, MOborders it8545.9%3.7 pCi/L+16.2 points
Johnson County, KSborders it5,24041.2%3.0 pCi/L+11.5 points
Leavenworth County, KSborders it51526.8%1.9 pCi/L−2.9 points
Where Wyandotte County's reported results fell, 2022, beside Kansas and the United States
ResultWyandotte County testsWyandotte County shareKansas shareU.S. shareAgainst Kansas
Under 2 pCi/L32647.5%45.8%54.5%+1.7 points
2 to 4 pCi/L15722.9%22.1%21.7%+0.8 points
4 pCi/L and above20429.7%32.0%23.9%−2.3 points
Wyandotte 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
Franklin County19 of 3810634.0%2.1 pCi/L
Lyon County20 of 384731.9%2.5 pCi/L
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
Wyandotte County radon tests by year, against Kansas' pooled share
YearTestsAt or above 4 pCi/LMedianHighestKansas, pooledChange from the row before
202268729.7%2.1 pCi/L35.2 pCi/L32.0%−6.1 points
20212,64335.8%2.8 pCi/L65.0 pCi/L31.8%+1.3 points
202075634.5%2.6 pCi/L44.1 pCi/L31.3%+1.8 points
201997232.7%2.5 pCi/L36.0 pCi/L33.7%+2.5 points
201881030.2%2.3 pCi/L35.6 pCi/L37.3%−5.7 points
201776335.9%2.6 pCi/L39.7 pCi/L37.3%−5.7 points
201639441.6%3.3 pCi/L30.9 pCi/L35.4%First on file

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

Wyandotte County, Geology

The ground under Wyandotte County

Predicted

USGS's geologic map puts all of Wyandotte County's mapped land in one class: high radon potential. 99.3% of it lies in the area the map calls Glacial Drift, to which USGS gives a radon index of 12, in the high band (12 to 17).

USGS's geologic areas under Wyandotte County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Glacial DriftGlacial drift and loess of varying thickness, largely locally derived from underlying and nearby Paleozoic sedimentary rocks.High1299.3%
Northwestern Dissected Till PlainsPennsylvanian shales covered by thick loess.High130.7%

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

Wyandotte County beside the ground around it

Wyandotte County has more high-potential ground than Kansas as a whole: 100% of its land against 59.9%. Of the 5 counties that border it, none has as large a share of high-potential ground; Platte County, MO comes nearest at 100%.

Share of land by USGS radon potential: Wyandotte County, the 5 counties bordering it and Kansas
AreaEPA zoneLow potentialModerate potentialHigh potential
Wyandotte CountyZone 1NoneNone100%
Johnson CountyZone 1None2.4%97.6%
Platte County, MOZone 1NoneNone100%
Leavenworth CountyZone 1None28.8%71.2%
Jackson County, MOZone 1None30.5%69.5%
Clay County, MOZone 1None27.4%72.6%
Kansas105 counties, pooled by land areaVariesNone40.1%59.9%

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

Local help

Wyandotte County, Local resources

Radon testing and mitigation in Wyandotte County

Listed radon businesses with an address in Wyandotte County:

Listed radon professionals by town: Kansas City, Bonner Springs

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

What it means

Wyandotte County, Questions

Questions about radon in Wyandotte County

Are radon levels high in Wyandotte County?

In 2022, 29.7% of the radon tests reported to CDC for Wyandotte County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.1 pCi/L. Of 38 Kansas counties with 30 or more tests for the same period, 23 reported a higher share; pooled, the state comes to 32.0%.

Which counties border Wyandotte County?

Wyandotte County borders 5 counties: Johnson County, KS, Platte County, MO, Leavenworth County, KS, Jackson County, MO and Clay County, MO.

Products

Wyandotte County, Products

Testing a home in Wyandotte County

In Wyandotte County, 29.7% of 687 tests reported to CDC in 2022 reached 4 pCi/L, against 32.0% pooled across Kansas. In Zone 1 the year-round level in Wyandotte County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Wyandotte County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Wyandotte County

Explore

Wyandotte County, Bordering counties

Counties bordering Wyandotte County

Calculated by Radon411

Wyandotte County, Cities and towns

Cities and towns in Wyandotte County

The Census Bureau estimates 170,597 residents in Wyandotte County for July 1, 2025, 1,676 more than in 2020 (+1.0%). Packed into its land, that is 1,125 people per square mile. Kansas City alone is home to 157,805 of them, 92.5% of the total. Reported testing is thin here: 687 tests over 2022, or 4.0 for every 1,000 residents (2025 estimate), where Kansas as a whole comes to 6.2.

From Kansas City to Lake Quivira, CDC publishes no figure by town: each reads Wyandotte County's.

The cities and towns in Wyandotte County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Kansas City157,805+1.0%92.5%
Bonner Springsextends beyond Wyandotte County7,962+1.8%Counted whole
Edwardsville4,748+0.9%2.8%
Lake Quiviraextends beyond Wyandotte County1,005−0.8%Counted whole

4 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 Wyandotte County is counted whole, so it has no share.

Wyandotte County, Homes

Homes in Wyandotte County

Of Wyandotte County's 68,614 homes, 69% are detached houses, against 72% across Kansas; 15% are in buildings of five or more homes. The homes are older than Kansas' as a whole: half were built before 1962 (1975 for Kansas), and 47% date from before 1960. 61% of occupied homes are lived in by their owner (Kansas: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Wyandotte County, Kansas, 2019 to 2023
HomesWyandotte CountyKansas
Housing units68,6141,285,221
Detached houses69%72%
In buildings of 5 or more15%13%
Mobile homes3%4%
Built before 196047%33%
Built since 200013%20%
Middle year built19621975
Owner-occupied61%67%

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