Listed for: Testing
Verified:Ohio state license
Locations and reports
Dayton lies in 2 counties, in EPA Zone 1. 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
The data
Dayton, What is published
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
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.
| County | EPA zone | Reported tests at or above 4 pCi/L | Median reported result | Tests reported | Annual years on file |
|---|---|---|---|---|---|
| Greene County | Zone 1: Highest predicted potential | 58.6% | 4.9 pCi/L | 2,602 tests | 0 |
| Montgomery County | Zone 1: Highest predicted potential | 50.3% | 4.0 pCi/L | 2,922 tests | 0 |
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.
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Local help
Dayton, Professionals
Businesses whose listed city is Dayton, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Dayton: 1 of 6
14 listings with Dayton as the city. See radon mitigation and testing in Dayton, or all radon professionals in Ohio.
Dayton, Local resources
Who to ask in Ohio: its radon program, test kits and professionals.
Free radon test kits are available for Ohio homeowners.
This program licenses companies and persons directly involved with the radon testing and mitigation industry.
What it means
Dayton, Questions
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.
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.
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.
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Dayton, Next steps
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