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Radon Levels in Wasatch County, Utah

EPA puts Wasatch County in Zone 2, its middle radon zone, and high results are common there: 51.9% of the 324 radon tests reported to CDC (2023) came back at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    51.9%

    15.8 pts above UT

    Wasatch
    51.9%
    Utah
    36.1%

    324 tests, 2023

  • Median result

    4.2pCi/L

    Action level reached

    Wasatch
    4.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    324

    10th of 22 by tests

    Wasatch
    324
    Salt Lake
    9,658

    Reported to CDC before any fix, 2023

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Utah

    9 of 22

    Middle half

    Wasatch
    51.9%
    Beaver
    66.7%

    By share, of 22 with 30+ tests

Read a result for Wasatch County

Starts at Wasatch County's median, 4.2 pCi/L

4.2pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 4.2 pCi/L

At or above 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Wasatch County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Wasatch County, At a glance

Wasatch County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Wasatch County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: Moderate across 58% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Wasatch County, 2023

Share of reported tests at or above 4 pCi/L, by year, Wasatch County
Share of reported tests at or above 4 pCi/L, by year, Wasatch County
YearShare of reported tests at or above 4 pCi/L
201471.4%
201568.8%
201667.7%
201769.9%
201860.3%
201964.1%
202060.5%
202147.6%
202251.7%
202351.9%

2023: 51.9%. Across these years the share ran from 47.6% to 71.4%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 324 tests reported to CDC for Wasatch County over 2023, many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).

How to read these figures

Wasatch County, Compared

Wasatch County radon figures, compared

Calculated by Radon411

More than half: 51.9% of the 324 radon tests reported to CDC for Wasatch County in 2023 read at least 4 pCi/L. That places it 9th of 22 Utah counties with 30 or more tests for the same period. That is 15.8 points above the 36.1% pooled from 29 Utah counties.

The median result, 4.2 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 66.7 pCi/L. The rest split 29.6% under 2 pCi/L and 18.5% from 2 to 4 (Utah: 35.4% and 28.5%). The reported tests do not follow EPA's Zone 2 label for Wasatch County (predicted average between 2 and 4 pCi/L): 51.9% of them reached 4 pCi/L, fewer than that label suggests.

No bordering county with a figure for the same period reported a higher share; the closest is Utah County at 40.6%, the lowest Summit County at 32.6%. Statewide for the same period, Beaver County reported the highest share (66.7%) and Washington County the lowest (9.9%).

The busiest year on file was 2022, with 609 tests reported; the quietest, 2019, had 39.

Over 10 years of annual figures the share fell 19.5 points, from 71.4% in 2014 to 51.9% in 2023; its peak was 71.4% in 2014. Nationally, every county with a figure for the same period pools to 33.4%; Wasatch County sits 18.5 points above it. CDC also counts 77 tests taken after mitigation in Wasatch County for the same period: tests in homes where a fix was already in.

Share of reported tests at or above 4 pCi/L by year, Wasatch County against Utah2014 to 2023, years with 30 or more tests: Wasatch County 71.4% to 51.9%, the state's pooled share 36.1% in 2023.
Wasatch CountyUtah, pooled
Share of reported tests at or above 4 pCi/L by year, Wasatch County against Utah: data table
YearTestsWasatch County, at or above 4 pCi/LUtah, pooled
20149871.4%43.4%
201515468.8%42.3%
201622367.7%39.8%
201717369.9%38.2%
201814660.3%36.6%
20193964.1%37.7%
20208660.5%37.6%
20218447.6%34.2%
202260951.7%37.7%
202332451.9%36.1%
Wasatch County against Utah, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Wasatch County
Wasatch County32451.9%4.2 pCi/LThis county
Utah, pooled29 counties, pooled27,42236.1%Not pooled−15.8 points
United States, pooled642 counties, pooled128,74033.4%Not pooled−18.5 points
Beaver Countyhighest in the state4266.7%9.3 pCi/L+14.8 points
Washington Countylowest in the state6579.9%1.3 pCi/L−42.0 points
Utah County, UTborders it7,83340.6%3.2 pCi/L−11.3 points
Duchesne County, UTborders it8139.5%3.2 pCi/L−12.4 points
Salt Lake County, UTborders it9,65833.1%2.6 pCi/L−18.8 points
Summit County, UTborders it41732.6%2.4 pCi/L−19.3 points
Where Wasatch County's reported results fell, 2023, beside Utah and the United States
ResultWasatch County testsWasatch County shareUtah shareU.S. shareAgainst Utah
Under 2 pCi/L9629.6%35.4%41.4%−5.8 points
2 to 4 pCi/L6018.5%28.5%25.2%−10.0 points
4 pCi/L and above16851.9%36.1%33.4%+15.8 points
Wasatch County ranked among the 22 Utah counties with 30 or more tests, by share at or above 4 pCi/L, 2023
CountyRankTestsAt or above 4 pCi/LMedian
Morgan County4 of 2220759.4%5.0 pCi/L
Millard County5 of 225558.2%4.4 pCi/L
Box Elder County6 of 2244957.9%4.9 pCi/L
Sevier County7 of 2210157.4%4.9 pCi/L
Cache County8 of 2299453.8%4.4 pCi/L
Wasatch County9 of 2232451.9%4.2 pCi/L
Uintah County10 of 2210451.0%4.2 pCi/L
Tooele County11 of 2257351.0%4.1 pCi/L
Utah County12 of 227,83340.6%3.2 pCi/L
Duchesne County13 of 228139.5%3.2 pCi/L
Emery County14 of 223938.5%2.7 pCi/L
Wasatch County radon tests by year, against Utah's pooled share
YearTestsAt or above 4 pCi/LMedianHighestUtah, pooledChange from the row before
202332451.9%4.2 pCi/L66.7 pCi/L36.1%+0.2 points
202260951.7%4.2 pCi/L230.1 pCi/L37.7%+4.1 points
20218447.6%3.8 pCi/L32.8 pCi/L34.2%−12.9 points
20208660.5%5.3 pCi/L42.8 pCi/L37.6%−3.6 points
20193964.1%5.8 pCi/L30.3 pCi/L37.7%+3.8 points
201814660.3%5.8 pCi/L45.7 pCi/L36.6%−9.6 points
201717369.9%7.6 pCi/L123.0 pCi/L38.2%+2.2 points
201622367.7%6.1 pCi/L54.7 pCi/L39.8%−1.1 points
201515468.8%8.1 pCi/L46.8 pCi/L42.3%−2.6 points
20149871.4%7.5 pCi/L64.9 pCi/L43.4%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Wasatch County, Geology

The ground under Wasatch County

Predicted

USGS's geologic map splits Wasatch County: 57.8% of its land is moderate radon potential and 42.2% high. The map puts 57.8% of Wasatch County in the area it calls Uinta Mountains and 41.3% in Uinta Basin, with one smaller area beside them. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 13, in the high band (12 to 17).

USGS's geologic areas under Wasatch County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Uinta MountainsCretaceous marine shales with Tertiary continental sedimentary rocks on the southern flank.Moderate1057.8%
Uinta BasinUranium-bearing Tertiary sandstone and siltstone.High1341.3%
Northern High PlateauTertiary and Cretaceous sedimentary rocks.High120.9%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Wasatch County beside the ground around it

On high-potential ground Wasatch County is close to Utah as a whole: 42.2% of its land against 32.8%. Of the 4 counties that border it, 2 have more high-potential ground, Duchesne County the most at 70.1%.

Share of land by USGS radon potential: Wasatch County, the 4 counties bordering it and Utah
AreaEPA zoneLow potentialModerate potentialHigh potential
Wasatch CountyZone 2None57.8%42.2%
Utah CountyZone 2None65.2%34.8%
Duchesne CountyZone 1None29.9%70.1%
Summit CountyZone 2None43.6%56.4%
Salt Lake CountyZone 2None68.3%31.7%
Utah29 counties, pooled by land areaVariesNone67.2%32.8%

The map rates the ground, not the air in any home.

Local help

Wasatch County, Local resources

Radon testing and mitigation in Wasatch County

What Utah's program says
Phone
(801) 536-0091
Disclosure when a home is sold or rented
Utah requires that sellers disclose "Hazardous Conditions: Are there any hazardous conditions on the Property such as Radon gas in house or well?"

What it means

Wasatch County, Questions

Questions about radon in Wasatch County

Are radon levels high in Wasatch County?

In 2023, 51.9% of the radon tests reported to CDC for Wasatch County, Utah were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.2 pCi/L. Of 22 Utah counties with 30 or more tests for the same period, 8 reported a higher share; pooled, the state comes to 36.1%.

Which counties border Wasatch County?

Wasatch County borders 4 counties: Utah County, Duchesne County, Summit County and Salt Lake County.

Products

Wasatch County, Products

Testing a home in Wasatch County

In Wasatch County, 51.9% of 324 tests reported to CDC in 2023 reached 4 pCi/L, against 36.1% pooled across Utah. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Wasatch County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Wasatch County homes, compared

Explore

Wasatch County, Bordering counties

Counties bordering Wasatch County

Calculated by Radon411

Wasatch County, Cities and towns

Cities and towns in Wasatch County

Wasatch County is growing: the Census Bureau puts it at 38,514 residents on July 1, 2025, up 9.8% from 35,061 in 2020. That works out to 33 people per square mile of land. Heber alone is home to 19,651 of them, 51.0% of the total. CDC's 324 reported tests for 2023 work out to 8.4 per 1,000 residents (2025 estimate), close to Utah's 7.7.

From Heber to Independence, CDC publishes no figure by town: each reads Wasatch County's.

The cities and towns in Wasatch County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Heber19,651+15.3%51.0%
Park Cityextends beyond Wasatch County8,587+2.1%Counted whole
Midway6,011−0.6%15.6%
Hideout1,587+65.0%4.1%
Daniel816−10.8%2.1%
Charleston402−7.8%1.0%
Wallsburg309+4.0%0.8%
Interlaken148−15.4%0.4%
Independence102−15.7%0.3%

9 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Wasatch County is counted whole, so it has no share.

Wasatch County, Homes

Homes in Wasatch County

Wasatch County is a place of houses on their own lots: 78% of its 15,446 homes are detached single-family houses, against 67% across Utah. Much of Wasatch County is recent building: 59% of its homes have gone up since 2000 and the middle year built is 2003, against 1991 for Utah. Owners live in 79% of the occupied homes (Utah: 71%), so for most households a test and a fix are their own to order.

Homes in Wasatch County, Utah, 2019 to 2023
HomesWasatch CountyUtah
Housing units15,4461,193,082
Detached houses78%67%
In buildings of 5 or more8%16%
Mobile homes1%3%
Built before 19609%16%
Built since 200059%37%
Middle year built20031991
Owner-occupied79%71%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.