Locations and reports
Radon Levels in Wyoming
What this means for you
- Your area: EPA rates 21 of Wyoming's 23 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 Wyoming'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 Wyoming, EPA's Map of Radon Zones places 21 of its 23 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
23 of 23 counties classified
EPA classifies counties, not states. Of the 23 counties in Wyoming with a zone, 21 are in Zone 1 and 2 in Zone 2.
- Zone 1: Highest predicted potentialgreater than 4 pCi/L21 of 23 counties · 91.3%
- Zone 2: Moderate predicted potential2 to 4 pCi/L2 of 23 counties · 8.7%
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 Wyoming's radon test figures by county: 23 of its 23 counties have one. Each county's share is in the county list.
Wyoming, In figures
Wyoming in figures
What the published data says about Wyoming, in words. A zone and a share of tests describe an area, never the level in any one home.
Predicted
PredictedEPA places 21 of Wyoming's 23 counties in Zone 1 and 2 in Zone 2.
Zone 1 counties, A to Z, begin with Albany County, Big Horn County and Campbell County; the county section below lists all 21.
Compared
Calculated by Radon41191% of Wyoming's counties with a zone on file are in Zone 1, a larger 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 Wyoming on file here.
23 of the 23 counties have a published county figure; the most tests in each one's latest year were reported for Laramie County (1,297 in 2017), Natrona County (664 in 2017) and Sheridan County (476 in 2017).
Local record
Wyoming's radon program is the Wyoming Radon Program, run by Wyoming Department of Health; its contacts are under Local resources.
One city has a page setting the figures of the counties it lies in side by side: Jackson.
Wyoming, Counties
Wyoming counties by EPA zone
PredictedAll 23 counties, by the zone EPA predicts for each. Every county has its own report.
Zone 1: highest predicted potential21
- Albany County27.9% of reported tests at or above 4 pCi/L, 2017
- Big Horn County42.4% of reported tests at or above 4 pCi/L, 2017
- Campbell County43.9% of reported tests at or above 4 pCi/L, 2017
- Carbon County41.3% of reported tests at or above 4 pCi/L, 2017
- Converse County62.3% of reported tests at or above 4 pCi/L, 2017
- Crook County58.8% of reported tests at or above 4 pCi/L, 2017
- Fremont County55.7% of reported tests at or above 4 pCi/L, 2017
- Goshen County41.7% of reported tests at or above 4 pCi/L, 2017
- Hot Springs County55.9% of reported tests at or above 4 pCi/L, 2017
- Johnson County34.8% of reported tests at or above 4 pCi/L, 2017
- Laramie County25.5% of reported tests at or above 4 pCi/L, 2017
- Lincoln County68.3% of reported tests at or above 4 pCi/L, 2017
- Natrona County55.7% of reported tests at or above 4 pCi/L, 2017
- Niobrara County25.0% of reported tests at or above 4 pCi/L, 2017
- Park County42.8% of reported tests at or above 4 pCi/L, 2017
- Sheridan County69.5% of reported tests at or above 4 pCi/L, 2017
- Sublette County50.0% of reported tests at or above 4 pCi/L, 2017
- Sweetwater County49.6% of reported tests at or above 4 pCi/L, 2017
- Teton County44.6% of reported tests at or above 4 pCi/L, 2017
- Uinta County24.6% of reported tests at or above 4 pCi/L, 2017
- Washakie County38.5% of reported tests at or above 4 pCi/L, 2017
Zone 2: moderate predicted potential2
Wyoming, Cities
Cities in Wyoming 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.
Wyoming, Local resources
Local resources in Wyoming
Who to ask in Wyoming: the state's radon program, test kits and professionals.
Wyoming Radon Program
Wyoming Department of Health
Wyoming’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.
Radon professionals
No professionals are listed in Wyoming yet. The state program can point you to registered testers and mitigators.
See the Wyoming directoryWyoming, Questions
Questions about radon in Wyoming
Common questions9 questions, answered from the figures above
Is radon a problem in Wyoming?
EPA's Map of Radon Zones places 21 of the 23 Wyoming counties it classifies in Zone 1, the highest predicted potential, 2 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.
Who does radon mitigation in Wyoming?
Radon411 has no certified mitigators listed for Wyoming 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 Wyoming
How do I get a radon test in Wyoming?
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 Wyoming 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 stateWyoming radon program
Which Wyoming counties are in EPA radon Zone 1?
21 counties are in Zone 1: Albany County, Big Horn County, Campbell County, Carbon County, Converse County, Crook County, Fremont County, Goshen County, and 13 more in the county table on this page. 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 Albany CountyRadon in Big Horn CountyRadon in Campbell County
Which Wyoming counties have the highest radon?
23 of Wyoming's 23 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 Wyoming are high?
CDC has published no statewide radon testing statistics for Wyoming, 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 Wyoming in?
Wyoming is in EPA Region 8: Mountains and Plains.
Do I need to test my home in Wyoming?
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 Wyoming?
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 Wyoming. 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.
Wyoming, Products
Testing and mitigation products
Whatever the figures for Wyoming 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.
Wyoming / 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.