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Radon in Dayton, Ohio

Dayton, Ohio spans 2 counties, Greene County and Montgomery County. Radon data is published by county, so this page sets their figures side by side.

OhioAbout 136,688 people

What this means for you

  • Your area: Dayton lies in 2 counties. EPA rates Greene County Zone 1 and Montgomery 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 2008 to 2017, the share of radon tests reported to CDC that were at or above 4 pCi/L was 58.6% in Greene County (2,602 tests) and 50.3% in Montgomery County (2,922 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.

Dayton, What is published

What is published for Dayton

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 Dayton, 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 136,688 people live in Dayton.

Dayton, Counties

Dayton's counties, side by side

Measured

Each county's own EPA zone and its own published CDC figures for 2008 to 2017, laboratory, 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.

  • Greene County
    EPA zone
    Zone 1: Highest predicted potential
    At or above 4 pCi/L
    58.6%
    Median result
    4.9 pCi/L
    Tests reported
    2,602 tests
    Annual years on file
    0
  • Montgomery County
    EPA zone
    Zone 1: Highest predicted potential
    At or above 4 pCi/L
    50.3%
    Median result
    4.0 pCi/L
    Tests reported
    2,922 tests
    Annual years on file
    0
The counties Dayton lies in, each with its own EPA zone and its own published CDC figures for 2008 to 2017, laboratory
CountyEPA zoneReported tests at or above 4 pCi/LMedian reported resultTests reportedAnnual years on file
Greene CountyZone 1: Highest predicted potential58.6%4.9 pCi/L2,602 tests0
Montgomery CountyZone 1: Highest predicted potential50.3%4.0 pCi/L2,922 tests0

The median reported pre-mitigation result for 2008 to 2017, laboratory was 4.9 pCi/L in Greene County and 4.0 pCi/L in Montgomery 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, 2008 to 2017, laboratory.

Dayton, Local resources

Local resources for Dayton

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

Radon Education and Licensing Program

Ohio Department of Health

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

Phone
614-728-0272
Email
indoor.radon@odh.ohio.gov
Licensing of radon professionals
This program licenses companies and persons directly involved with the radon testing and mitigation industry.
Visit the program's page(opens in a new tab)

Test kits

The program says: Free radon test kits are available for Ohio homeowners.

Free and low-cost kitsCompare kits

Radon professionals

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

Professionals in Ohio

Dayton, Questions

Questions about radon in Dayton

What radon zone is Dayton in?

EPA's Map of Radon Zones classifies counties, not cities. Greene County and Montgomery 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 Dayton's counties?

For 2008 to 2017, laboratory, the share of radon tests reported to CDC that were at or above 4 pCi/L was 58.6% in Greene County (2,602 tests) and 50.3% in Montgomery County (2,922 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 Dayton?

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 Greene County and Montgomery County, the counties Dayton lies in.

Dayton, Keep reading

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Dayton / Next steps

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