Your county health department
Wyoming doesn't run a statewide free testing program that we know of. Some county health departments test wells or sell kits, so call yours first.
Wyoming's private well pageRadon in Wyoming well water, by county
Radon is widespread, over the limit in 15% or more of tested wells, in 1 of the 5 Wyoming counties with 10 or more tested wells. A county's share tells you how likely a problem is nearby. Only a test of your own well tells you what's in it.
How Wyoming compares with the rest of the country
Across Wyoming, about 1 in 18 tested wells had radon in water over 4,000 pCi/L, a level the EPA proposed (8 of 147). Across all tested wells in the US it's about 1 in 24. So radon in water turns up somewhat more often in Wyoming than in the country as a whole. Check your county below.
Why it matters: It escapes into the air when you shower or run the tap, and breathing it raises the risk of lung cancer.
Radon is a gas given off by uranium in granite and similar rock.
Radon in tested wells, county by county
Share of each county's tested wells with at least one result over 4,000 pCi/L, a level the EPA proposed. Counties need 10 or more tested wells to be listed. Widespread means 15% or more, worth checking 5 to 15%, rare under 5%.
| County | Wells tested | Wells over the limit | Level |
|---|---|---|---|
| Sweetwater County | 31 | Widespread | |
| Carbon County | 40 | Rare | |
| Campbell County | 11 | Rare | |
| Sheridan County | 10 | Rare | |
| Washakie County | 10 | Rare |
13 more Wyoming counties have 1 to 9 tested wells for radon in water, too few to rate.
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Where to get your well tested for radon in water in Wyoming
A lab Wyoming certifies
Ask for radon in water by name. Results from a certified lab count for a home sale or a loan.
Labs certified by WyomingA mail-in kit
Fill the bottles at your kitchen tap and mail them back. We mark the kits that include radon in water.
Compare kitsKeep reading about wells in Wyoming
- Well water testing in Wyoming: how to get tested and what turns up statewide
- Radon in well water: where it comes from, what it does and how to remove it
- Nitrate in Wyoming wells, by county
- Arsenic in Wyoming wells, by county
- Uranium in Wyoming wells, by county
- Manganese in Wyoming wells, by county
- Lead in Wyoming wells, by county
Questions people ask about radon in water in Wyoming
Is there radon in water in Wyoming well water?
Radon is widespread, over the limit in 15% or more of tested wells, in 1 of the 5 Wyoming counties with 10 or more tested wells. Across Wyoming, about 1 in 18 tested wells had radon in water over 4,000 pCi/L, a level the EPA proposed (8 of 147). Across all tested wells in the US it's about 1 in 24. So radon in water turns up somewhat more often in Wyoming than in the country as a whole. Check your county below.
Where can I get my well tested for radon in water in Wyoming?
Use a lab certified by Wyoming for drinking water, or a mail-in kit that includes radon in water from a certified lab. Some county health departments test wells too, so call yours first.
See Wyoming's list of certified labs, or compare mail-in kits.
Where these numbers come from
- Lab tests: Water Quality Portal (USGS and EPA), well samples since 2000. A well counts as over if any of its tests was over 4,000 pCi/L, a level the EPA proposed. Wells tested for studies and monitoring, not a random sample of homes.
- Likely overstated: our own check of who tested the wells, when and where. How we check.
- State programs and links: Department of Environmental Quality (DEQ), Know Your Well program.