Skip to content
RADON411

Locations and reports

Missouri Radon Map and Levels by County

Missouri's counties span all three EPA radon zones. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

Predicted
11 of 115counties in Zone 1, EPA's highest radon zone
Measured
By countyCDC publishes Missouri's test figures by county: 115 of 115 counties have one.
Your home
Test to knowNo area figure here is a reading of your home.
How to test this homeFind a certified tester

The data

Missouri, At a glance

Missouri at a glance

Predicted: EPA radon zone

115 of 115 counties classified

EPA classifies counties, not states. Of the 115 counties in Missouri with a zone, 11 are in Zone 1, 97 in Zone 2 and 7 in Zone 3.

  • Zone 1: Highest predicted potentialgreater than 4 pCi/L11 of 115 counties · 9.6%
  • Zone 2: Moderate predicted potential2 to 4 pCi/L97 of 115 counties · 84.3%
  • Zone 3: Lower predicted potentialless than 2 pCi/L7 of 115 counties · 6.1%

An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

CDC test figures, county by county

CDC publishes Missouri's radon test figures by county: 115 of its 115 counties have one. Each one's share is in the county list.

Missouri, Counties

Missouri counties by EPA zone

Predicted

Missouri's radon map, then all 115 counties by the zone EPA predicts for each, highest reported share of tests at or above 4 pCi/L first. Each has its own report.

Missouri radon map by county: EPA radon zones. Map of Missouri's 115 counties shaded by EPA radon zone: Zone 1 in red-orange, Zone 2 in amber, Zone 3 in pale sand. 11 in Zone 1, 97 in Zone 2, 7 in Zone 3.
Missouri radon map by countyEPA radon zones for Missouri's counties: 11 counties in Zone 1, 97 counties in Zone 2, 7 counties in Zone 3.Predicted potential for each county, not a reading of any home. Homes with elevated levels of radon have been found in all three zones.

Zone 1: highest predicted potential11

Local help

Missouri, Local resources

Local resources in Missouri

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

What Missouri's program says
Phone
573-751-6102
Email
radon@health.mo.gov

Radon Action Brief

National Radon Action MonthPre-sale

The radon brief for your Missouri county, in one dated file.

  • Your area's radon record, explained.
  • Your plan to test this week.
  • Fix costs and pros near you.

Save 64%Sale price: $8.99Price after the sale: $25Ends Jan 31Then $25

Get your Missouri county's BriefSee a free sample

Area data, not a test of the building.

What it means

Missouri, Questions

Questions about radon in Missouri

Common questions

9 questions, answered from the figures above

Is radon a problem in Missouri?

EPA's Map of Radon Zones places 11 of the 115 Missouri counties it classifies in Zone 1, the highest predicted potential, 97 in Zone 2 and 7 in Zone 3. An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.

Missouri on the radon mapRadon levels by state

How do I get a radon test in Missouri?

EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. The Missouri radon program is the place to ask about certified testers and any test kit offer it runs.

How to test a homeFree and low-cost kits by stateMissouri radon program

Which Missouri counties are in EPA radon Zone 1?

11 counties are in Zone 1: Andrew County, Atchison County, Buchanan County, Cass County, Clay County, Clinton County, Holt County, Iron County, and 3 more in the county table on this page. Zone 1 is EPA's class for highest predicted potential, a predicted average indoor screening level greater than 4 pCi/L. A zone is a prediction for a county, not a measurement of any home.

Radon in Andrew CountyRadon in Atchison CountyRadon in Buchanan County

Who does radon mitigation in Missouri?

Radon411's Missouri directory lists 27 radon businesses for testing, mitigation or both, each with the licensing list it was read from. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional.

How radon mitigation worksWhat mitigation costsRadon professionals in Missouri

Which Missouri counties have the highest radon?

115 of Missouri's 115 counties have an EPA radon zone published here. Radon411 will not rank counties on data it does not hold, and a zone is a prediction for an area rather than a measurement of any building.

What share of radon tests in Missouri are high?

CDC has published no statewide radon testing statistics for Missouri, so we cannot give a figure. Where CDC does publish one, the percentage describes radon tests reported to CDC, not homes.

Which EPA region is Missouri in?

Missouri is in EPA Region 7: Midwest.

Do I need to test my home in Missouri?

Yes, wherever you live in the state. 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.

Why does this page show coverage rather than one radon level for Missouri?

A statewide figure averages counties with very different geology and very different numbers of reported tests, so it hides more than it shows. The county report is the level at which the EPA zone, the geologic potential and the reported testing statistics are actually published, which is why the county table above links to every one of them.

If you own, buy, sell or rent

What these figures mean for each reader, with the guide that covers it

The zone counts on this page describe counties across Missouri. They are predictions for areas, and none of them measures your building.

Missouri in figures

The figures above, said in words

What the published data says about Missouri, in words. A zone and a share of tests describe an area, never the level in any one home.

    • Predicted

      Predicted

      EPA places 11 of Missouri's 115 counties in Zone 1, 97 in Zone 2 and 7 in Zone 3.

      Zone 1 counties, A to Z, begin with Andrew County, Atchison County and Buchanan County; the county section below lists all 11.

    • Compared

      Calculated by Radon411

      10% of Missouri's counties with a zone on file are in Zone 1, a smaller share than across all U.S. counties (34%). It is a share of counties, not of land, people or homes.

  • Reported tests

    Measured

    CDC has no statewide testing figure for Missouri on file here.

    115 of the 115 counties have a published county figure; the most tests in each one's latest year were reported for St. Louis County (443 tests in 2023), Jackson County (204 tests in 2023) and St. Charles County (103 tests in 2023).

  • Local record

    Missouri's radon program is the Missouri Radon Program, run by Missouri Department of Health and Senior Services; its contacts are under Local resources.

    4 cities have a page setting the figures of the counties it lies in side by side: Kansas City, Columbia, Springfield and Lee's Summit.

Products

Missouri, Products

Testing and mitigation products

Whatever the figures for Missouri show, only a test tells you about one home.

Test kits and monitors42

See all products

As an Amazon Associate, Radon411 earns from qualifying purchases.

Best radon monitors for Missouri homes, compared

Testing

5

Mitigation

3

Explore

Cities in Missouri with their own page

Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.

Missouri, Next steps

What to do next

  1. LearnKnow what radon isWhat radon is, how it gets indoors, and why a county zone is not a reading for your home.Learn about radon
  2. TestTest the building you live inShort-term or long-term, where the device goes, and closed-house conditions.How to test
  3. FixBring a high level downHow a mitigation system works, and the retest that confirms it.How mitigation works
  4. Find a proHire a certified professionalMeasurement and mitigation professionals by state, with their certifications.Find a professional

Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.