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Radon in Kansas City, Missouri

Kansas City, Missouri spans 4 counties, Cass County, Clay County, Jackson County and Platte County. Radon data is published by county, so this page sets their figures side by side.

MissouriAbout 521,220 people

What this means for you

  • Your area: Kansas City lies in 4 counties. EPA rates Cass County Zone 1, Clay County Zone 1, Jackson County Zone 1 and Platte County Zone 1, where Zone 1 is the highest of its three radon zones. Zones are predictions for whole counties, and homes with elevated levels occur in all three zones.
  • Local tests: For 2023, the share of radon tests reported to CDC that were at or above 4 pCi/L was 62.5% in Cass County (24 tests), 44.6% in Clay County (83 tests), 44.1% in Jackson County (204 tests) and 37.9% in Platte County (29 tests). EPA's action level is 4 pCi/L.
  • Your home: The only way to know your home’s level is to test it.
How to testFind a certified tester

pCi/L (picocuries per liter) is the unit radon is measured in. EPA recommends fixing a home at 4 pCi/L or above, its action level.

Kansas City, What is published

What is published for Kansas City

Information:

Radon data is published by county, not by city

Radon data is published by county, not by city. EPA assigns radon zones to counties, and CDC publishes radon test figures by county. Neither publishes a figure for Kansas City, so every radon figure on this page belongs to a county and is labelled with it. Only a test tells you about one home.

Each county has its own CDC test figures, shown below side by side. About 521,220 people live in Kansas City.

Kansas City, Counties

Kansas City's counties, side by side

Measured

Each county's own EPA zone and its own published CDC figures for 2023, the newest period any of them has. A county without a figure for that period is shown without one, never with a figure from another year.

  • Cass County
    EPA zone
    Zone 1: Highest predicted potential
    At or above 4 pCi/L
    62.5%
    Median result
    4.6 pCi/L
    Tests reported
    24 tests
    Annual years on file
    10
  • Clay County
    EPA zone
    Zone 1: Highest predicted potential
    At or above 4 pCi/L
    44.6%
    Median result
    3.6 pCi/L
    Tests reported
    83 tests
    Annual years on file
    10
  • Jackson County
    EPA zone
    Zone 1: Highest predicted potential
    At or above 4 pCi/L
    44.1%
    Median result
    3.4 pCi/L
    Tests reported
    204 tests
    Annual years on file
    10
  • Platte County
    EPA zone
    Zone 1: Highest predicted potential
    At or above 4 pCi/L
    37.9%
    Median result
    3.0 pCi/L
    Tests reported
    29 tests
    Annual years on file
    10
The counties Kansas City lies in, each with its own EPA zone and its own published CDC figures for 2023
CountyEPA zoneReported tests at or above 4 pCi/LMedian reported resultTests reportedAnnual years on file
Cass CountyZone 1: Highest predicted potential62.5%4.6 pCi/L24 tests10
Clay CountyZone 1: Highest predicted potential44.6%3.6 pCi/L83 tests10
Jackson CountyZone 1: Highest predicted potential44.1%3.4 pCi/L204 tests10
Platte CountyZone 1: Highest predicted potential37.9%3.0 pCi/L29 tests10

The median reported pre-mitigation result for 2023 was 4.6 pCi/L in Cass County, 3.6 pCi/L in Clay County, 3.4 pCi/L in Jackson County and 3.0 pCi/L in Platte County.

CDC counts radon tests that were reported to it, not homes, and figures from few tests can swing widely from year to year. Each county’s report has its full history.

Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2023.

Kansas City, Professionals

Radon professionals listed in Kansas City

Businesses whose listed city is Kansas City, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.

1 listing with Kansas City as the city. See every listing in Kansas City, or all radon professionals in Missouri.

Kansas City, Local resources

Local resources for Kansas City

Who to ask in Missouri: the state's radon program, test kits and professionals.

Missouri Radon Program

Missouri Department of Health and Senior Services

Missouri’s radon program answers questions about testing, mitigation and the rules where you live.

Phone
573-751-6102
Email
radon@health.mo.gov
Visit the program's page(opens in a new tab)

Test kits

The program says: Free radon test kits are available for Missouri residents (limit one per household).

Free and low-cost kitsCompare kits

Radon professionals

1 listing covers Kansas City.

Professionals in Missouri

Kansas City, Questions

Questions about radon in Kansas City

What radon zone is Kansas City in?

EPA's Map of Radon Zones classifies counties, not cities. Cass County, Clay County, Jackson County and Platte County are in Zone 1 (highest predicted potential). A zone is a prediction for a whole county and never tells you the level in one home.

How many radon tests come back high in Kansas City's counties?

For 2023, the share of radon tests reported to CDC that were at or above 4 pCi/L was 62.5% in Cass County (24 tests), 44.6% in Clay County (83 tests), 44.1% in Jackson County (204 tests) and 37.9% in Platte County (29 tests). Each is that county's own figure, counting tests reported to CDC, not homes. Radon411 does not average or combine them into a figure for the city.

Should I test my home in Kansas City?

Yes. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. How to test a home.

The answers use the published figures of Cass County, Clay County, Jackson County and Platte County, the counties Kansas City lies in.

Kansas City, Keep reading

Keep reading

Kansas City / Next steps

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