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Locations and reports

Radon in Knoxville, Tennessee

Knoxville, Tennessee lies in Knox County, which EPA places in Zone 1, highest predicted potential. Radon data is published by county, so this page reads Knox County's figures.

TennesseeAbout 202,021 people

What this means for you

  • Your area: EPA rates Knox County, where Knoxville is, Zone 1, the highest 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 203 radon tests reported to CDC for Knox County (2023), 17.7% 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.

Knoxville, What is published

What is published for Knoxville

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

Knox County has an EPA zone and its own CDC test figures, shown below. About 202,021 people live in Knoxville.

Knoxville, Counties

The county Knoxville 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.

Knox CountyZone 1Highest predicted potential

17.7%
Reported tests at or above 4 pCi/L, 2023
1.8 pCi/L
Median reported result
203 tests
Tests reported to CDC
2
Annual years on file

The median reported pre-mitigation result for 2023 was 1.8 pCi/L in Knox 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.

Knoxville, Local resources

Local resources for Knoxville

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

Knoxville, Questions

Questions about radon in Knoxville

What radon zone is Knoxville in?

EPA's Map of Radon Zones classifies counties, not cities. Knox County is 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 Knoxville's counties?

For 2023, the share of radon tests reported to CDC that were at or above 4 pCi/L was 17.7% in Knox County (203 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 Knoxville?

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 Knox County, the county Knoxville lies in.

Knoxville, Keep reading

Keep reading

Knoxville / Next steps

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