Utah County · Radon Data
Wasatch County Radon Levels
9.1
pCi/L average
1,754
tests analyzed
3.4×
WHO threshold (2.7)
Risk classification
What 9.1 pCi/L Means for Wasatch County Homes
Very High Risk
Significantly above the EPA action level. Mitigation is strongly recommended for any home in this area. Long-term exposure at these levels can more than double lung cancer risk for non-smokers.
Wasatch County's average of 9.1 pCi/L is 3.4× the WHO mitigation threshold of 2.7 pCi/L and 2.3× the EPA action level of 4.0 pCi/L. Utah's statewide average is 4.4 pCi/L, and the national average is 1.3 pCi/L.
County averages represent the arithmetic mean of all pre-mitigation tests in the area — they don't mean every home will measure exactly 9.1 pCi/L. Radon levels vary significantly based on foundation type, soil composition, construction materials, and ventilation. Two adjacent homes can have radon levels that differ by a factor of 5 or more. The only way to know your home's level is to test.
There is no safe level of radon exposure. Long-term exposure to radon is the second-leading cause of lung cancer in the US, responsible for approximately 21,000 deaths annually. The good news: mitigation systems are effective, reliable, and typically reduce radon levels by 80–99%.
City-Level Data
Radon Levels by City in Wasatch County
4 cities with 20+ tests. Sorted highest to lowest. Click any city for detailed data and year-over-year trends.
| City | Avg pCi/L | Risk |
|---|---|---|
| Wallsburg | 17.9 | |
| Midway | 9.3 | |
| Heber City | 8.7 | |
| Park City | 3.9 |
Only cities with 20+ tests shown. Smaller sample sizes may not reliably represent a city's true average. All data: Alpha Energy Laboratories, 2015–August 2025.
Why Does Wasatch County Have Elevated Radon Levels?
Wasatch County occupies a mountain basin framed by the Wasatch and Uinta ranges, whose granite and metamorphic bedrock contains naturally occurring uranium. As uranium decays, radon moves upward through fractured rock and soil into homes. The basin's enclosed topography concentrates this soil gas, and Heber Valley's growth has placed more homes directly over high-radon geology.
Regardless of county-level geology, the only authoritative measurement for any home is a test conducted inside that specific building. Foundation type, crawl space vs. slab construction, and ventilation all dramatically affect indoor levels — which is why testing every home individually is the only reliable approach.
Wasatch County Radon — Frequently Asked Questions
What is the average radon level in Wasatch County, Utah?
Wasatch County has an average indoor radon level of 9.1 pCi/L based on 1,754 pre-mitigation tests analyzed by Alpha Energy Laboratories from 2015 through August 2025. This is 3.4× the WHO's recommended mitigation threshold of 2.7 pCi/L and 2.1× Utah's statewide average of 4.4 pCi/L.
Is radon a serious concern in Wasatch County?
Yes. Wasatch County's average of 9.1 pCi/L is classified as very high risk. Significantly above the EPA action level. Mitigation is strongly recommended for any home in this area. Long-term exposure at these levels can more than double lung cancer risk for non-smokers. Radon is the second-leading cause of lung cancer in the United States after smoking, responsible for approximately 21,000 deaths annually.
Which cities in Wasatch County have the highest radon levels?
Based on test data, the highest-averaging cities in Wasatch County are: Wallsburg (17.9 pCi/L, 38 tests), Midway (9.3 pCi/L, 504 tests), Heber City (8.7 pCi/L, 1,186 tests). Remember that city averages can mask significant variation between individual homes.
How do I get a radon test in Wasatch County, Utah?
Utah Radon provides free certified radon test kits to Utah homeowners, including those in Wasatch County. The kit is mailed to your home, you place it according to instructions, mail it back to Alpha Energy Laboratories, and receive your results within 2–3 weeks. There is no cost for the kit, shipping, or lab analysis. Request yours at utahradon.org/free-test-kit.
Protect your Wasatch County home
With a county average of 9.1 pCi/L — 3.4× the WHO mitigation threshold — Wasatch County homes should be tested. Your free kit is waiting.
Request your free test kit