Skip to content
RADON411
$5

County radon report

Get it

Locations and reports

Radon in Tucson, Arizona

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

ArizonaAbout 548,371 people

What this means for you

  • Your area: EPA rates Pima County, where Tucson 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 410 radon tests reported to CDC for Pima County (2008 to 2017, laboratory), 6.8% 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.

Tucson, What is published

What is published for Tucson

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

Pima County has an EPA zone and its own CDC test figures, shown below. About 548,371 people live in Tucson.

Tucson, Counties

The county Tucson lies in

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.

Pima CountyZone 2Moderate predicted potential

6.8%
Reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
1.1 pCi/L
Median reported result
410 tests
Tests reported to CDC
0
Annual years on file

The median reported pre-mitigation result for 2008 to 2017, laboratory was 1.1 pCi/L in Pima 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.

Tucson, Local resources

Local resources for Tucson

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

Arizona's radon program

Arizona Department of Health Services

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

Visit the program's page(opens in a new tab)

Test kits

Ask the program whether it has free or discounted kits, or compare kits you can buy.

Free and low-cost kitsCompare kits

Radon professionals

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

Professionals in Arizona

Tucson, Questions

Questions about radon in Tucson

What radon zone is Tucson in?

EPA's Map of Radon Zones classifies counties, not cities. Pima 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 Tucson's counties?

For 2008 to 2017, laboratory, the share of radon tests reported to CDC that were at or above 4 pCi/L was 6.8% in Pima County (410 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 Tucson?

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 Pima County, the county Tucson lies in.

Tucson, Keep reading

Keep reading

Tucson / Next steps

What to do next