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Radon in Lee's Summit, Missouri

Lee's Summit lies in 2 counties, in EPA Zone 1; 97.5% of it is in Jackson County, where 44.1% of 204 reported tests (2023) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so the only way to know your home's level is to test it.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    44.1%

    8.4 pts above MO

    Jackson
    44.1%
    Missouri
    35.7%

    Jackson, 2nd of 7 in MO, 2023

  • Median result

    3.4pCi/L

    Below action level

    Jackson
    3.4 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of Jackson's tests, 2023

  • Highest county

    45.5%

    Cass

    Cass
    45.5%
    Jackson
    44.1%

    2 counties, 2 with 30+ tests, 2023

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    Jackson; Cass Zone 1

  • Tests reported

    204

    In Jackson

    Jackson
    204
    Cass
    988

    Reported to CDC before any fix, 2023

Read a result for Lee's Summit

Starts at Jackson County's median, 3.4 pCi/L

3.4pCi/L

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

EPA’s reading of 3.4 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. Jackson County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Lee's Summit, What is published

What is published for Lee's Summit

Information:

Every figure for Lee's Summit is a county's

Radon data is published by county, not by city, and Lee's Summit reaches into 2 counties: Jackson County and Cass County. Each has its own EPA zone and its own CDC test figures, set side by side below and each labelled with its county. Only a test tells you about one home.

Lee's Summit covers 63.9 square miles of land: 97.5% of it lies in Jackson County and 2.5% in Cass County. About 107,514 people live there, 1,683 to the square mile.

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.

  • 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
  • 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
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
Jackson CountyZone 1: Highest predicted potential44.1%3.4 pCi/L204 tests10
Cass CountyZone 1: Highest predicted potential62.5%4.6 pCi/L24 tests10

Lee's Summit spans 2 counties, each with its own EPA zone and its own CDC figure: Jackson County (Zone 1, 44.1% of 204 tests) and Cass County (Zone 1, 62.5% of 24 tests).

Jackson County ranks 2nd of 7 Missouri counties with 30 or more tests for that period, 8.4 points above the 35.7% pooled across Missouri's counties, 10.7 points above the national pool of 33.4%. Of the city's other county, Cass County reported 62.5%.

The counties nearest Lee's Summit with a CDC figure for 2023, measured from the middle of the city: Clay County (27 miles, 44.6% of 83 tests), Boone County (112 miles, 42.9% of 63 tests) and Greene County (128 miles, 27.1% of 48 tests). Across the 6 nearest, the share at or above 4 pCi/L runs from 22.6% to 44.6%; the farthest of them, St. Louis County, is 213 miles away at 22.6%.

The directory lists 8 businesses with an address in Lee's Summit, 8 for testing and 2 for mitigation. Missouri's other cities with a page of their own: Kansas City, Columbia and Springfield.

Against Missouri and its other counties

Radon test figures for the counties Lee's Summit lies in
CountyShare of Lee's SummitTestsAt or above 4 pCi/LMedianMissouri, pooledRank in the stateEPA zone
Jackson County97.5%20444.1%3.4 pCi/L35.7%2 of 7Zone 1
Cass County2.5%98845.5%3.5 pCi/L30.6%7 of 72Zone 1

Shares of tests people chose to run and report, by county (2023); the state's is its counties' counts added up, calculated by Radon411. Only a test measures a home.

The counties around Lee's Summit

By distance from the middle of Lee's Summit; counties with 30 or more tests.

Nearest counties to Lee's Summit with 30 or more tests
CountyDistanceTestsAt or above 4 pCi/LMedian
Clay County27 mi8344.6%3.6 pCi/L
Boone County112 mi6342.9%3.6 pCi/L
Greene County128 mi4827.1%2.9 pCi/L
St. Charles County200 mi10340.8%3.4 pCi/L
Jefferson County213 mi3638.9%3.4 pCi/L
St. Louis County213 mi44322.6%2.0 pCi/L

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

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

Lee's Summit, Geology

The ground under Lee's Summit

Predicted

USGS's geologic map puts all of Lee's Summit's mapped land in one class: high radon potential. All of it lies in the area the map calls Northwestern Dissected Till Plains, to which USGS gives a radon index of 13, in the high band (12 to 17).

USGS's geologic areas under Lee's Summit
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Northwestern Dissected Till PlainsPennsylvanian shales covered by thick loess.High13100%

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

Lee's Summit beside its counties and Missouri

Lee's Summit sits on more high-potential ground than Jackson County as a whole: 100% of the city against 69.5% of the county. Lee's Summit has more high-potential ground than Missouri as a whole: 100% of its land against 8.2%.

Share of land by USGS radon potential: Lee's Summit, the counties it lies in and Missouri
AreaEPA zoneLow potentialModerate potentialHigh potential
Lee's SummitBy countyNoneNone100%
Jackson CountyZone 1None30.5%69.5%
Cass CountyZone 1None64.5%35.5%
Missouri115 counties, pooled by land areaVaries5.8%86.0%8.2%

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

Lee's Summit, Homes

Homes in Lee's Summit

Of Lee's Summit's 41,358 homes, 73% are detached houses, against 66% across Jackson County; 13% are in buildings of five or more homes. Much of Lee's Summit is recent building: 34% of its homes have gone up since 2000 and the middle year built is 1994, against 1970 for Jackson County. 74% of occupied homes are lived in by their owner (Jackson County: 59%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Lee's Summit, Jackson County, Missouri, 2019 to 2023
HomesLee's SummitJackson CountyMissouri
Housing units41,358333,3852,809,501
Detached houses73%66%70%
In buildings of 5 or more13%20%13%
Mobile homesunder 1%1%5%
Built before 19606%37%28%
Built since 200034%16%21%
Middle year built199419701978
Owner-occupied74%59%68%

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

Local help

Lee's Summit, Professionals

Radon professionals listed in Lee's Summit

Businesses whose listed city is Lee's Summit, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.

8 listings with Lee's Summit as the city. See radon mitigation and testing in Lee's Summit, or all radon professionals in Missouri.

Lee's Summit, Local resources

Local resources for Lee's Summit

Who to ask in Missouri: its radon program, test kits and professionals.

The program's own words on licensing are on the Missouri page.

What it means

Lee's Summit, Questions

Questions about radon in Lee's Summit

What radon zone is Lee's Summit in?

Both counties Lee's Summit reaches into (Jackson County and Cass County) are in Zone 1, the map's highest class: a predicted county average above 4 pCi/L. EPA zones counties, not cities, so that is the zone for every part of Lee's Summit.

What are radon levels in Lee's Summit?

44.1% of the 204 tests reported from Jackson County for 2023 were at or above 4 pCi/L, the level at which EPA says to fix a home: high results are ordinary around Lee's Summit. The median reported result was 3.4 pCi/L. Cass County reported 62.5% of 24 tests; the counties are kept apart.

Should I test my home in Lee's Summit?

Yes. About 90 of the 204 tests reported from Jackson County were at or above 4 pCi/L. That is above Missouri's pooled 35.7%, and ranks Jackson County 2nd of the 7 Missouri counties with 30 or more tests. No map says which homes those are. How to test a home.

What ground is Lee's Summit built on, as far as radon goes?

USGS's geologic map puts all of Lee's Summit on one named area, "Northwestern Dissected Till Plains", rated high for radon potential, radon index 13.

Is radon higher in the counties around Lee's Summit?

Some are and some are not. Against Jackson County's 44.1%, 1 of the 6 nearest counties with a figure report more and 5 less, from St. Louis County (22.6%, 213 miles off) to Clay County (44.6%, 27 miles off).

Who tests for or fixes radon in Lee's Summit?

Radon411's directory has 8 businesses with an address in Lee's Summit, 8 listed for testing and 2 for mitigation. Every entry names the public list it was taken from. Radon professionals in Lee's Summit.

The answers use the published figures of Jackson County and Cass County, the counties Lee's Summit lies in.

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