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Radon Levels in Sedgwick County, Kansas

EPA puts Sedgwick County in Zone 2, its middle radon zone, and 18.4% of its 4,911 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

    18.4%

    13.6 pts below KS

    Sedgwick
    18.4%
    Kansas
    32.0%

    4,911 tests, 2022

  • Median result

    1.3pCi/L

    Below action level

    Sedgwick
    1.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2022

  • Tests reported

    4,911

    2nd of 38 by tests

    Sedgwick
    4,911
    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

    35 of 38

    Lowest quarter

    Sedgwick
    18.4%
    Mitchell
    57.4%

    By share, of 38 with 30+ tests

Read a result for Sedgwick County

Starts at Sedgwick County's median, 1.3 pCi/L

1.3pCi/L

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

EPA’s reading of 1.3 pCi/L

Below 2 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 below 2 pCi/L, the level at which EPA says a fix should be considered. Sedgwick County's median reported result, 2022.

Interpret this reading

The data

Sedgwick County, At a glance

Sedgwick County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Sedgwick 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Sedgwick County, 2022

Share of reported tests at or above 4 pCi/L, by year, Sedgwick County
Share of reported tests at or above 4 pCi/L, by year, Sedgwick County
YearShare of reported tests at or above 4 pCi/L
201622.8%
201730.0%
201830.2%
201924.0%
202018.1%
202115.9%
202218.4%

2022: 18.4%. Across these years the share ran from 15.9% to 30.2%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 4,911 tests reported to CDC for Sedgwick 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

Sedgwick County, Compared

Sedgwick County radon figures, compared

Calculated by Radon411

Sedgwick County's 4,911 reported tests in 2022 had a middle value of 1.3 pCi/L and a maximum of 78.3 pCi/L, and 18.4% reached 4 pCi/L. Kansas as a whole (96 Kansas counties, pooled) comes to 32.0%: 13.6 points higher than here.

Among its state's counties it ranks 35th 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, 3,096 tests (63.0%) came in under 2 pCi/L, against 45.8% statewide, and 913 tests (18.6%) fell between 2 and 4, against 22.1% statewide. The busiest year on file was 2021, with 16,650 tests reported; the quietest, 2016, had 3,560.

EPA's 1993 zone map puts Sedgwick County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

Next door, the shares run from 25.4% in Reno County to 39.8% in Cowley County. Over 7 years of annual figures the share fell 4.4 points, from 22.8% in 2016 to 18.4% in 2022; its peak was 30.2% in 2018.

CDC also counts 246 tests taken after mitigation in Sedgwick 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, Sedgwick County against Kansas2016 to 2022, years with 30 or more tests: Sedgwick County 22.8% to 18.4%, the state's pooled share 32.0% in 2022.
Sedgwick CountyKansas, pooled
Share of reported tests at or above 4 pCi/L by year, Sedgwick County against Kansas: data table
YearTestsSedgwick County, at or above 4 pCi/LKansas, pooled
20163,56022.8%35.4%
20174,11630.0%37.3%
20184,10930.2%37.3%
20193,89024.0%33.7%
20205,96718.1%31.3%
202116,65015.9%31.8%
20224,91118.4%32.0%
Sedgwick County against Kansas, the United States and nearby counties, 2022
AreaTestsAt or above 4 pCi/LMedianDifference from Sedgwick County
Sedgwick County4,91118.4%1.3 pCi/LThis county
Kansas, pooled96 counties, pooled18,38532.0%Not pooled+13.6 points
United States, pooled853 counties, pooled333,14023.9%Not pooled+5.5 points
Mitchell Countyhighest in the state4757.4%6.2 pCi/L+39.0 points
Crawford Countylowest in the state345.9%0.8 pCi/L−12.5 points
Cowley County, KSborders it11839.8%3.3 pCi/L+21.4 points
Harvey County, KSborders it23234.1%2.8 pCi/L+15.7 points
Sumner County, KSborders it7929.1%2.3 pCi/L+10.7 points
Butler County, KSborders it55025.5%2.1 pCi/L+7.1 points
Reno County, KSborders it24025.4%2.2 pCi/L+7.0 points
Kingman County, KSborders it2119.0%2.1 pCi/L+0.6 points
Where Sedgwick County's reported results fell, 2022, beside Kansas and the United States
ResultSedgwick County testsSedgwick County shareKansas shareU.S. shareAgainst Kansas
Under 2 pCi/L3,09663.0%45.8%54.5%+17.2 points
2 to 4 pCi/L91318.6%22.1%21.7%−3.5 points
4 pCi/L and above90218.4%32.0%23.9%−13.6 points
Sedgwick 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
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
Pottawatomie County32 of 3820625.2%1.7 pCi/L
Geary County33 of 3836525.2%1.9 pCi/L
Finney County34 of 387623.7%3.0 pCi/L
Sedgwick County35 of 384,91118.4%1.3 pCi/L
Montgomery County36 of 386911.6%0.8 pCi/L
Allen County37 of 38348.8%0.9 pCi/L
Crawford County38 of 38345.9%0.8 pCi/L
Sedgwick County radon tests by year, against Kansas' pooled share
YearTestsAt or above 4 pCi/LMedianHighestKansas, pooledChange from the row before
20224,91118.4%1.3 pCi/L78.3 pCi/L32.0%+2.5 points
202116,65015.9%1.2 pCi/L91.8 pCi/L31.8%−2.2 points
20205,96718.1%1.3 pCi/L37.2 pCi/L31.3%−5.9 points
20193,89024.0%2.0 pCi/L116.5 pCi/L33.7%−6.2 points
20184,10930.2%2.4 pCi/L101.0 pCi/L37.3%+0.2 points
20174,11630.0%2.3 pCi/L40.0 pCi/L37.3%+7.2 points
20163,56022.8%2.1 pCi/L118.0 pCi/L35.4%First on file

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

Sedgwick County, Geology

The ground under Sedgwick County

Predicted

USGS's geologic map puts all of Sedgwick County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Glaciated Area, to which USGS gives a radon index of 9, in the moderate band (9 to 11).

USGS's geologic areas under Sedgwick 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.Moderate9100%

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

Sedgwick County beside the ground around it

Across Kansas 59.9% of the land is rated high; none of Sedgwick County's is. Of the 6 counties that border it, 2 have more high-potential ground, Kingman County the most at 51.8%.

Share of land by USGS radon potential: Sedgwick County, the 6 counties bordering it and Kansas
AreaEPA zoneLow potentialModerate potentialHigh potential
Sedgwick CountyZone 2None100%None
Harvey CountyZone 2None100%None
Sumner CountyZone 20.3%99.7%None
Kingman CountyZone 1None48.2%51.8%
Butler CountyZone 2None100%None
Reno CountyZone 2None72.7%27.3%
Cowley CountyZone 20.2%99.8%None
Kansas105 counties, pooled by land areaVariesNone40.1%59.9%

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

Local help

Sedgwick County, Local resources

Radon testing and mitigation in Sedgwick County

Listed radon businesses with an address in Sedgwick County:

Listed radon professionals by town: Wichita, Haysville, Bel Aire, Mulvane, Goddard, Andale

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

What it means

Sedgwick County, Questions

Questions about radon in Sedgwick County

Are radon levels high in Sedgwick County?

In 2022, 18.4% of the radon tests reported to CDC for Sedgwick County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.3 pCi/L. Of 38 Kansas counties with 30 or more tests for the same period, 34 reported a higher share; pooled, the state comes to 32.0%.

Which counties border Sedgwick County?

Sedgwick County borders 6 counties: Harvey County, Sumner County, Kingman County, Butler County, Reno County and Cowley County.

Products

Sedgwick County, Products

Testing a home in Sedgwick County

In Sedgwick County, 18.4% of 4,911 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 Sedgwick County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Sedgwick County homes, compared

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Sedgwick County, Bordering counties

Counties bordering Sedgwick County

Calculated by Radon411

Sedgwick County, Cities and towns

Cities and towns in Sedgwick County

The Census Bureau estimates 538,433 residents in Sedgwick County for July 1, 2025, 13,602 more than in 2020 (+2.6%). That works out to 540 people per square mile of land. Wichita alone is home to 400,987 of them, 74.5% of the total. CDC's 4,911 reported tests for 2022 work out to 9.1 per 1,000 residents (2025 estimate), close to Kansas' 6.2.

From Wichita to Viola, CDC publishes no figure by town: each reads Sedgwick County's.

The 12 largest cities and towns in Sedgwick County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Wichita400,987+0.7%74.5%
Derby26,606+3.5%4.9%
Haysville11,353+0.7%2.1%
Bel Aire10,287+23.8%1.9%
Park City9,458+12.5%1.8%
Maize7,853+35.0%1.5%
Valley Center7,685+4.4%1.4%
Mulvaneextends beyond Sedgwick County7,030+11.6%Counted whole
Goddard6,638+29.3%1.2%
Clearwater2,792+4.9%0.5%
Kechi2,375+6.0%0.4%
Cheney2,178−0.2%0.4%
  • Sedgwick (part)
  • Colwich
  • Garden Plain
  • Andale
  • Mount Hope
  • Eastborough
  • Bentley
  • Viola

20 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Sedgwick County is counted whole, so it has no share.

Sedgwick County, Homes

Homes in Sedgwick County

Of Sedgwick County's 225,795 homes, 70% are detached houses, against 72% across Kansas; 15% are in buildings of five or more homes. Half of its homes were built before 1977, close to Kansas' 1975: 32% date from before 1960 and 21% from 2000 or later. 62% 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 Sedgwick County, Kansas, 2019 to 2023
HomesSedgwick CountyKansas
Housing units225,7951,285,221
Detached houses70%72%
In buildings of 5 or more15%13%
Mobile homes3%4%
Built before 196032%33%
Built since 200021%20%
Middle year built19771975
Owner-occupied62%67%

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