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Radon in Grand Junction, Colorado

Grand Junction, Colorado lies in Mesa County, which EPA places in Zone 1, highest predicted potential. Radon data is published by county, so this page reads Mesa County's figures.

ColoradoAbout 71,827 people

What this means for you

  • Your area: EPA rates Mesa County, where Grand Junction 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 567 radon tests reported to CDC for Mesa County (2023), 18.9% 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.

Grand Junction, What is published

What is published for Grand Junction

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

Mesa County has an EPA zone and its own CDC test figures, shown below. About 71,827 people live in Grand Junction.

Grand Junction, Counties

The county Grand Junction 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.

Mesa CountyZone 1Highest predicted potential

18.9%
Reported tests at or above 4 pCi/L, 2023
2.2 pCi/L
Median reported result
567 tests
Tests reported to CDC
10
Annual years on file

The median reported pre-mitigation result for 2023 was 2.2 pCi/L in Mesa 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.

Grand Junction, Local resources

Local resources for Grand Junction

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

Colorado's radon program

Colorado Department of Public Health and Environment

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

Licensing of radon professionals
Listed contractors are certified by the National Radon Proficiency Program or the National Radon Safety Board, and must be licensed by the Colorado Department of Regulatory Agencies.
Disclosure when a home is sold or rented
As of August 7, 2023, landlords in Colorado are required to disclose radon information when a tenant signs a lease agreement.
Visit the program's page(opens in a new tab)

Test kits

The program says: Order a free radon test kit

Free and low-cost kitsCompare kits

Radon professionals

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

Professionals in Colorado

Grand Junction, Questions

Questions about radon in Grand Junction

What radon zone is Grand Junction in?

EPA's Map of Radon Zones classifies counties, not cities. Mesa 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 Grand Junction's counties?

For 2023, the share of radon tests reported to CDC that were at or above 4 pCi/L was 18.9% in Mesa County (567 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 Grand Junction?

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 Mesa County, the county Grand Junction lies in.

Grand Junction, Keep reading

Keep reading

Grand Junction / Next steps

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