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Radon in Lee's Summit, Missouri

Lee's Summit, Missouri spans 2 counties, Cass County and Jackson County. Radon data is published by county, so this page sets their figures side by side.

MissouriAbout 107,514 people

What this means for you

  • Your area: Lee's Summit lies in 2 counties. EPA rates Cass County Zone 1 and Jackson 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) and 44.1% in Jackson County (204 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.

Lee's Summit, What is published

What is published for Lee's Summit

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 Lee's Summit, 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 107,514 people live in Lee's Summit.

Lee's Summit, Counties

Lee's Summit'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
  • 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
The counties Lee's Summit 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
Jackson CountyZone 1: Highest predicted potential44.1%3.4 pCi/L204 tests10

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

Lee's Summit, Local resources

Local resources for Lee's Summit

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

Radon testers and mitigators in Missouri, each with how its listing was checked.

Professionals in Missouri

Lee's Summit, Questions

Questions about radon in Lee's Summit

What radon zone is Lee's Summit in?

EPA's Map of Radon Zones classifies counties, not cities. Cass County and Jackson 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 Lee's Summit'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) and 44.1% in Jackson County (204 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 Lee's Summit?

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 and Jackson County, the counties Lee's Summit lies in.

Lee's Summit, Keep reading

Keep reading

Lee's Summit / Next steps

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