Locations and reports
Radon Levels in Utah
What this means for you
- Your area: EPA rates 7 of Utah's 29 classified counties Zone 1, the highest of its three radon zones. Zones are predictions for whole counties, and homes with elevated levels occur in all three zones.
- Local tests: CDC publishes Utah's radon test results by county. Open your county below to see its figures.
- Your home: The only way to know your home’s level is to test it.
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.
For Utah, EPA's Map of Radon Zones places 7 of its 29 classified counties in Zone 1, highest predicted potential, a prediction for each county as a whole. Radon levels vary from home to home, so only a test measures the level in yours.
Predicted: EPA radon zone
29 of 29 counties classified
EPA classifies counties, not states. Of the 29 counties in Utah with a zone, 7 are in Zone 1 and 22 in Zone 2.
- Zone 1: Highest predicted potentialgreater than 4 pCi/L7 of 29 counties · 24.1%
- Zone 2: Moderate predicted potential2 to 4 pCi/L22 of 29 counties · 75.9%
An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.
This is a county-level geologic prediction. It is not a measurement of any address, and houses with elevated radon are found in all three zones.
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
CDC publishes Utah's radon test figures by county: 29 of its 29 counties have one. Each county's share is in the county list.
Utah, In figures
Utah in figures
What the published data says about Utah, in words. A zone and a share of tests describe an area, never the level in any one home.
Predicted
PredictedEPA places 7 of Utah's 29 counties in Zone 1 and 22 in Zone 2.
Zone 1 counties, A to Z, begin with Carbon County, Duchesne County and Grand County; the county section below lists all 7.
Compared
Calculated by Radon41124% of Utah's counties with a zone on file are in Zone 1, a smaller share than across all U.S. counties (34%). It is a share of counties, not of land, people or homes.
Reported tests
MeasuredCDC has no statewide testing figure for Utah on file here.
29 of the 29 counties have a published county figure; the most tests in each one's latest year were reported for Salt Lake County (11,117 in 2023), Utah County (9,052 in 2023) and Davis County (3,995 in 2023).
Local record
Utah's radon program is the Indoor Radon Program, run by Utah Department of Environmental Quality; its contacts are under Local resources.
One city has a page setting the figures of the counties it lies in side by side: Ivins.
Utah, Counties
Utah counties by EPA zone
PredictedAll 29 counties, by the zone EPA predicts for each. Every county has its own report.
Zone 1: highest predicted potential7
- Carbon County23.2% of reported tests at or above 4 pCi/L, 2023
- Duchesne County39.5% of reported tests at or above 4 pCi/L, 2023
- Grand County23.9% of reported tests at or above 4 pCi/L, 2023
- Piute CountyReported testing not yet available
- Sanpete County60.0% of reported tests at or above 4 pCi/L, 2023
- Sevier County57.4% of reported tests at or above 4 pCi/L, 2023
- Uintah County51.0% of reported tests at or above 4 pCi/L, 2023
Zone 2: moderate predicted potential22
- Beaver County66.7% of reported tests at or above 4 pCi/L, 2023
- Box Elder County57.9% of reported tests at or above 4 pCi/L, 2023
- Cache County53.8% of reported tests at or above 4 pCi/L, 2023
- Daggett County50.0% of reported tests at or above 4 pCi/L, 2023
- Davis County28.4% of reported tests at or above 4 pCi/L, 2023
- Emery County38.5% of reported tests at or above 4 pCi/L, 2023
- Garfield County40.0% of reported tests at or above 4 pCi/L, 2023
- Iron County21.1% of reported tests at or above 4 pCi/L, 2023
- Juab County63.3% of reported tests at or above 4 pCi/L, 2023
- Kane County15.8% of reported tests at or above 4 pCi/L, 2023
- Millard County58.2% of reported tests at or above 4 pCi/L, 2023
- Morgan County59.4% of reported tests at or above 4 pCi/L, 2023
- Rich County53.8% of reported tests at or above 4 pCi/L, 2023
- Salt Lake County33.1% of reported tests at or above 4 pCi/L, 2023
- San Juan County52.6% of reported tests at or above 4 pCi/L, 2023
- Summit County32.6% of reported tests at or above 4 pCi/L, 2023
- Tooele County51.0% of reported tests at or above 4 pCi/L, 2023
- Utah County40.6% of reported tests at or above 4 pCi/L, 2023
- Wasatch County51.9% of reported tests at or above 4 pCi/L, 2023
- Washington County9.9% of reported tests at or above 4 pCi/L, 2023
- Wayne County70.4% of reported tests at or above 4 pCi/L, 2023
- Weber County28.6% of reported tests at or above 4 pCi/L, 2023
Utah, Cities
Cities in Utah with their own page
Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.
Utah, Local resources
Local resources in Utah
Who to ask in Utah: the state's radon program, test kits and professionals.
Indoor Radon Program
Utah Department of Environmental Quality
Utah’s radon program answers questions about testing, mitigation and the rules where you live.
- Phone
- (801) 536-0091
- Disclosure when a home is sold or rented
Utah requires that sellers disclose "Hazardous Conditions: Are there any hazardous conditions on the Property such as Radon gas in house or well?"
Test kits
Ask the program whether it has free or discounted kits, or compare kits you can buy.
Radon professionals
No professionals are listed in Utah yet. The state program can point you to registered testers and mitigators.
See the Utah directoryUtah, Questions
Questions about radon in Utah
Common questions9 questions, answered from the figures above
Is radon a problem in Utah?
EPA's Map of Radon Zones places 7 of the 29 Utah counties it classifies in Zone 1, the highest predicted potential, 22 in Zone 2 and 0 in Zone 3. An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.
How do I get a radon test in Utah?
EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. The Utah radon program is the place to ask about certified testers and any test kit offer it runs.
How to test a homeFree and low-cost kits by stateUtah radon program
Which Utah counties are in EPA radon Zone 1?
7 counties are in Zone 1: Carbon County, Duchesne County, Grand County, Piute County, Sanpete County, Sevier County, Uintah County. Zone 1 is EPA's class for highest predicted potential, a predicted average indoor screening level greater than 4 pCi/L. A zone is a prediction for a county, not a measurement of any home.
Radon in Carbon CountyRadon in Duchesne CountyRadon in Grand County
Who does radon mitigation in Utah?
Radon411 has no certified mitigators listed for Utah yet. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional.
How radon mitigation worksWhat mitigation costsRadon professionals in Utah
Which Utah counties have the highest radon?
29 of Utah's 29 counties have an EPA radon zone published here. Radon411 will not rank counties on data it does not hold, and a zone is a prediction for an area rather than a measurement of any building.
What share of radon tests in Utah are high?
CDC has published no statewide radon testing statistics for Utah, so we cannot give a figure. Where CDC does publish one, the percentage describes radon tests reported to CDC, not homes.
Which EPA region is Utah in?
Utah is in EPA Region 8: Mountains and Plains.
Do I need to test my home in Utah?
Yes, wherever you live in the state. 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.
Why does this page show coverage rather than one radon level for Utah?
A statewide figure averages counties with very different geology and very different numbers of reported tests, so it hides more than it shows. The county report is the level at which the EPA zone, the geologic potential and the reported testing statistics are actually published, which is why the county table above links to every one of them.
What these figures mean if you own, buy, sell or rent
The zone counts on this page describe counties across Utah. They are predictions for areas, and none of them measures your building.
- How to test a home
If you own your home
Test the lowest lived-in level; a short-term kit screens in days, a long-term kit reflects the year.
- Buying a house: radon guide
If you are buying
Ask for past results and any system's post-mitigation test, and test during the sale.
- Selling a house: radon guide
If you are selling
Testing before you list puts the timing in your hands; disclosure rules differ by state.
- Radon in rental homes
If you rent, or rent out a home
A tenant can test; a fix is the owner's to make, and duties differ by state.
How long a test has to run, under what conditions, and what EPA says a result means: the testing standard, in full.
Utah, Products
Testing and mitigation products
Whatever the figures for Utah show, only a test tells you about one home.
Testing
- Short-term test kitsPassive detectors exposed for a few days under closed-building conditions, then analyzed by a lab.
- Long-term test kitsDetectors exposed for more than 90 days, for a closer picture of the annual average.
- Continuous monitorsPowered devices that log radon on a repeating cycle, often used for transaction tests.
- Digital detectorsConsumer devices that display a running radon reading without a lab.
- Water radon testsKits for radon dissolved in well water, analyzed by a lab.
Mitigation
- Mitigation fansThe inline fan that keeps a soil depressurization system running, sized by the installer.
- System indicatorsU-tube manometers and fan alarms that show whether a mitigation system is still working.
- Sealing materialsCrack, joint and sump sealing used alongside a mitigation system, not instead of one.
Utah / Next steps
What to do next
Learn
Know what radon is
What radon is, how it gets indoors, and why a county zone is not a reading for your home.
Learn about radonTest
Test the building you live in
Short-term or long-term, where the device goes, and closed-house conditions.
How to testFix
Bring a high level down
How a mitigation system works, and the retest that confirms it.
How mitigation worksFind a pro
Hire a certified professional
Measurement and mitigation professionals by state, with their certifications.
Find a professional
Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.