Wyoming has significant radon risk, with an estimated 50% of Wyoming homes testing above the EPA action level of 4.0 pCi/L. Wyoming’s geology — including uranium-bearing sandstone formations that once fueled a major uranium mining industry, granite in the Laramie and Wind River ranges, and sedimentary formations throughout the basin areas — creates high radon potential across much of the state. Wyoming has limited specific radon regulation but relies on EPA guidance and national certification standards.
EPA Radon Zone Designation
Most Wyoming counties are Zone 1 or Zone 2. The highest-radon areas include the Wyoming uranium belt counties of south-central Wyoming (Carbon, Fremont, Natrona, and Converse counties), the Laramie area (Albany County), and the Casper area (Natrona County). The northeastern Wyoming counties including Weston and Niobrara counties also show elevated radon due to uranium-bearing geology. Even the lower-elevation basin counties show significant radon levels due to uranium-rich sedimentary formations.
Radon Contractor Requirements in Wyoming
Wyoming does not have a state radon contractor licensing statute. Wyoming relies on NRPP and NRSB national certification as the operative credential for radon professionals. The Wyoming Department of Environmental Quality administers radon program resources. For certified radon professionals in Wyoming, search the NRPP directory at nrpp.info or the NRSB directory at nrsb.org by location.
Radon Disclosure Requirements in Wyoming
Wyoming does not have a radon-specific real estate disclosure statute. The Wyoming Seller’s Real Property Disclosure Act requires disclosure of known material defects — and known elevated radon test results are material information that sellers should disclose. Real estate agents in Wyoming’s high-radon areas recommend radon testing as standard practice during the inspection period.
Frequently Asked Questions
Why is Wyoming a high-radon state?
Wyoming sits on extensive uranium-bearing geological formations — the same uranium deposits that made Wyoming a major uranium mining state historically. These uranium-rich sandstones and sedimentary rocks produce significant radon across much of the state, particularly in south-central and northeastern Wyoming.
Does Wyoming require radon contractor licensing?
Wyoming has no state radon contractor licensing statute. NRPP or NRSB national certification is the operative credential. Search the NRPP directory at nrpp.info for certified Wyoming contractors.
What Wyoming counties have the highest radon?
South-central Wyoming counties in the uranium belt — Carbon, Fremont, Natrona, and Converse counties — have the highest radon potential. Albany County (Laramie) and northeastern Wyoming counties including Weston and Niobrara also show elevated levels.
Wyoming Uranium Belt and Radon History
Wyoming’s uranium belt — stretching across south-central Wyoming through Carbon, Fremont, Natrona, Converse, and Campbell counties — was one of the most productive uranium mining regions in the U.S. during the mid-20th century. The same uranium-bearing sandstone formations that made Wyoming a mining powerhouse are directly responsible for the state’s elevated radon levels. Even in areas without active or historical mining, the underlying geology produces radon at rates that make testing essential for all Wyoming homeowners.
Radon in Casper and Cheyenne
Natrona County (Casper) sits directly over uranium-bearing geological formations and is among Wyoming’s highest-radon areas. Laramie County (Cheyenne) in southeastern Wyoming shows elevated levels due to both geological factors and proximity to the front range geology. The University of Wyoming in Albany County (Laramie) is in a Zone 1 area. Jackson Hole (Teton County) in northwestern Wyoming shows elevated radon from the Teton Range granitic geology. Essentially no county in Wyoming is low-risk.
Radon and Wyoming Real Estate Transactions
While Wyoming lacks a radon-specific disclosure statute, radon is increasingly standard in Wyoming real estate transactions — particularly in Casper, Cheyenne, and the resort markets of Jackson Hole and Cody. Many Wyoming real estate contracts include radon contingencies by custom and buyer demand, even without a statutory requirement. Buyers in Wyoming should always request radon testing during the inspection period and include a contingency at 4.0 pCi/L or lower in their offer.
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