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Locations and reports

Radon in Dayton, Ohio

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

Predicted
Zone 1Highest predicted potential
Measured
By countyEach county's own CDC figures are set side by side below.
Your home
Test to knowNo area figure here is a reading of your home.

The data

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.

Radon Action Brief

National Radon Action MonthPre-sale

The radon brief for Dayton, 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 the Dayton BriefSee a free sample

Area data, not a test of the building.

Local help

Dayton, Professionals

Radon professionals listed in Dayton

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.

Dayton, Local resources

Local resources for Dayton

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

What it means

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.