Utah has significant radon risk, with an estimated 40–45% of Utah homes testing above the EPA action level of 4.0 pCi/L. Utah’s geology — including uranium-bearing sandstone formations (Colorado Plateau), volcanic rock, granitic mountain ranges, and the Wasatch Front urban corridor geology — creates high radon potential across much of the state. Utah’s history as a major uranium mining state contributes to widespread radon-productive geological formations.
EPA Radon Zone Designation
Most Utah counties are Zone 1 or Zone 2. The Wasatch Front counties — Salt Lake, Utah, Davis, and Weber counties — show elevated radon levels and contain the vast majority of Utah’s population. Cache County (Logan area) and Summit County are also Zone 1. The Colorado Plateau counties of southeastern Utah — San Juan, Carbon, Emery, and Grand counties — overlie uranium-bearing sandstone and show high radon potential.
Radon Contractor Requirements in Utah
Utah does not have a state radon contractor licensing statute. Utah relies on NRPP and NRSB national certification as the operative credential for radon professionals. The Utah Department of Environmental Quality administers radon program resources. Search nrpp.info or nrsb.org for certified Utah radon professionals by location.
Radon in Utah’s Wasatch Front
The Wasatch Front urban corridor — where approximately 80% of Utah’s population lives — has significant radon risk. Salt Lake County homes, particularly older homes on the east bench with proximity to the Wasatch Range granitic geology, show elevated radon levels. The rapid pace of new residential construction along the Wasatch Front makes RRNC inclusion a significant public health opportunity. Utah DEQ strongly recommends testing for all Wasatch Front homes.
Frequently Asked Questions
Is the Salt Lake City area high in radon?
Yes. Salt Lake County and surrounding Wasatch Front counties — Utah, Davis, Weber — are Zone 1 or Zone 2 with elevated radon potential. Radon testing is recommended for all Wasatch Front homes, particularly those on the east bench near the mountain geology.
Does Utah require radon contractor licensing?
No. Utah has no state licensing statute. NRPP or NRSB national certification is the operative credential. Search nrpp.info for certified Utah contractors.
Why does Utah have high radon levels?
Utah sits on extensive uranium-bearing geological formations — the same Colorado Plateau sandstones that made Utah a major uranium mining state. Granitic mountain geology along the Wasatch Front also contributes. Combined with common slab-on-grade and basement construction in the Wasatch Front corridor, these create significant radon entry pathways.
Salt Lake and Utah County Radon Data
Salt Lake County and Utah County (Provo/Orem area) are the two most populous counties in Utah and show Zone 1 to Zone 2 radon levels. The east bench communities of Salt Lake City — Holladay, Millcreek, Cottonwood Heights — that sit closer to the Wasatch Range granite geology tend to show higher radon than lower valley communities. Utah County’s Provo-Orem corridor has similar patterns. Summit County (Park City) is Zone 1 with elevated radon from mountain granitic geology — a significant consideration given the area’s active real estate market and high-value homes.
Colorado Plateau Radon in Southeastern Utah
Southeastern Utah counties — San Juan, Carbon, Emery, Grand, and Garfield — sit on the Colorado Plateau’s uranium-bearing Chinle and Morrison Formation sandstones. The same geological formations that once supported extensive uranium mining in the Moab area (Grand County) produce ongoing radon in residential buildings. Carbon County (Price) and Emery County have historically elevated radon readings. Even in smaller southeastern Utah communities, radon testing is warranted.
Utah Testing Resources
The Utah Department of Environmental Quality (UDEQ) Division of Radiation Control administers the state radon program. UDEQ provides county-level radon data, certified contractor information, and educational materials. Utah participates in EPA’s SIRG program. The UDEQ radon program can provide specific guidance on testing methodology and interpretation for Utah’s unique geological context. Contact UDEQ or search nrpp.info by zip code for certified Utah radon professionals.
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