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Locations and reports

Radon in Chattanooga, Tennessee

Chattanooga, Tennessee lies in Hamilton County, which EPA places in Zone 2, moderate predicted potential. Radon data is published by county, so this page reads Hamilton County's figures.

TennesseeAbout 194,144 people

What this means for you

  • Your area: EPA rates Hamilton County, where Chattanooga is, Zone 2, the middle of its three radon zones. That is a prediction for the whole county, and homes with elevated levels occur in all three zones.
  • Local tests: Of 169 radon tests reported to CDC for Hamilton County (2023), 2.4% were at or above 4 pCi/L, EPA's action level.
  • 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.

Chattanooga, What is published

What is published for Chattanooga

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 Chattanooga, so every radon figure on this page belongs to a county and is labelled with it. Only a test tells you about one home.

Hamilton County has an EPA zone and its own CDC test figures, shown below. About 194,144 people live in Chattanooga.

Chattanooga, Counties

The county Chattanooga lies in

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.

Hamilton CountyZone 2Moderate predicted potential

2.4%
Reported tests at or above 4 pCi/L, 2023
0.7 pCi/L
Median reported result
169 tests
Tests reported to CDC
2
Annual years on file

The median reported pre-mitigation result for 2023 was 0.7 pCi/L in Hamilton 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, 2023.

Chattanooga, Local resources

Local resources for Chattanooga

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

Tennessee Radon Program

Department of Environment & Conservation

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

Phone
1-800-232-1139
Email
TDEC.Radon@tn.gov
Visit the program's page(opens in a new tab)

Test kits

The program says: The Tennessee Radon Program provides free radon test kits and information assistance to residents, while also providing training opportunities to radon professionals across the state.

Free and low-cost kitsCompare kits

Radon professionals

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

Professionals in Tennessee

Chattanooga, Questions

Questions about radon in Chattanooga

What radon zone is Chattanooga in?

EPA's Map of Radon Zones classifies counties, not cities. Hamilton County is in Zone 2 (moderate 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 Chattanooga's counties?

For 2023, the share of radon tests reported to CDC that were at or above 4 pCi/L was 2.4% in Hamilton County (169 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 Chattanooga?

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 Hamilton County, the county Chattanooga lies in.

Chattanooga, Keep reading

Keep reading

Chattanooga / Next steps

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