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Radon Levels in Tooele County, Utah

EPA puts Tooele County in Zone 2, its middle radon zone, and high results are common there: 51.0% of the 573 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

    51.0%

    14.9 pts above UT

    Tooele
    51.0%
    Utah
    36.1%

    573 tests, 2023

  • Median result

    4.1pCi/L

    Action level reached

    Tooele
    4.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    573

    7th of 22 by tests

    Tooele
    573
    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

    11 of 22

    Middle half

    Tooele
    51.0%
    Beaver
    66.7%

    By share, of 22 with 30+ tests

Read a result for Tooele County

Starts at Tooele County's median, 4.1 pCi/L

4.1pCi/L

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

EPA’s reading of 4.1 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. Tooele County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Tooele County, At a glance

Tooele County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Tooele 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Tooele County, 2023

Share of reported tests at or above 4 pCi/L, by year, Tooele County
Share of reported tests at or above 4 pCi/L, by year, Tooele County
YearShare of reported tests at or above 4 pCi/L
201459.3%
201551.2%
201662.1%
201751.4%
201846.2%
201959.7%
202050.0%
202153.0%
202255.1%
202351.0%

2023: 51.0%. Across these years the share ran from 46.2% to 62.1%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 573 tests reported to CDC for Tooele 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

Tooele County, Compared

Tooele County radon figures, compared

Calculated by Radon411

More than half: 51.0% of the 573 radon tests reported to CDC for Tooele County in 2023 read at least 4 pCi/L. That places it 11th of 22 Utah counties with 30 or more tests for the same period. That is 14.9 points above the 36.1% pooled from 29 Utah counties.

The median result, 4.1 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 40.8 pCi/L. The rest split 26.7% under 2 pCi/L and 22.3% from 2 to 4 (Utah: 35.4% and 28.5%). The reported tests do not follow EPA's Zone 2 label for Tooele County (predicted average between 2 and 4 pCi/L): 51.0% of them reached 4 pCi/L, fewer than that label suggests.

2 of its 6 bordering counties with figures ran higher, led by Juab County at 63.3%; Davis County reported 28.4%. 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 975 tests reported; the quietest, 2014, had 27.

Over 9 years of annual figures the share held within 2 points, from 51.2% in 2015 to 51.0% in 2023; its peak was 62.1% in 2016. Nationally, every county with a figure for the same period pools to 33.4%; Tooele County sits 17.6 points above it. CDC also counts 71 tests taken after mitigation in Tooele 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, Tooele County against Utah2015 to 2023, years with 30 or more tests: Tooele County 51.2% to 51.0%, the state's pooled share 36.1% in 2023.
Tooele CountyUtah, pooled
Share of reported tests at or above 4 pCi/L by year, Tooele County against Utah: data table
YearTestsTooele County, at or above 4 pCi/LUtah, pooled
20154151.2%42.3%
201613262.1%39.8%
201717351.4%38.2%
201819546.2%36.6%
201911959.7%37.7%
202011050.0%37.6%
202120253.0%34.2%
202297555.1%37.7%
202357351.0%36.1%
Tooele County against Utah, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Tooele County
Tooele County57351.0%4.1 pCi/LThis county
Utah, pooled29 counties, pooled27,42236.1%Not pooled−14.9 points
United States, pooled642 counties, pooled128,74033.4%Not pooled−17.6 points
Beaver Countyhighest in the state4266.7%9.3 pCi/L+15.7 points
Washington Countylowest in the state6579.9%1.3 pCi/L−41.1 points
Juab County, UTborders it4963.3%5.0 pCi/L+12.3 points
Box Elder County, UTborders it44957.9%4.9 pCi/L+6.9 points
Utah County, UTborders it7,83340.6%3.2 pCi/L−10.4 points
Salt Lake County, UTborders it9,65833.1%2.6 pCi/L−17.9 points
Weber County, UTborders it1,66928.6%2.1 pCi/L−22.4 points
Davis County, UTborders it3,59428.4%2.4 pCi/L−22.6 points
Where Tooele County's reported results fell, 2023, beside Utah and the United States
ResultTooele County testsTooele County shareUtah shareU.S. shareAgainst Utah
Under 2 pCi/L15326.7%35.4%41.4%−8.7 points
2 to 4 pCi/L12822.3%28.5%25.2%−6.2 points
4 pCi/L and above29251.0%36.1%33.4%+14.9 points
Tooele 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
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
Salt Lake County15 of 229,65833.1%2.6 pCi/L
Summit County16 of 2241732.6%2.4 pCi/L
Tooele County radon tests by year, against Utah's pooled share
YearTestsAt or above 4 pCi/LMedianHighestUtah, pooledChange from the row before
202357351.0%4.1 pCi/L40.8 pCi/L36.1%−4.1 points
202297555.1%4.6 pCi/L47.4 pCi/L37.7%+2.1 points
202120253.0%4.3 pCi/L90.0 pCi/L34.2%+3.0 points
202011050.0%3.9 pCi/L35.4 pCi/L37.6%−9.7 points
201911959.7%4.4 pCi/L65.3 pCi/L37.7%+13.5 points
201819546.2%3.6 pCi/L32.3 pCi/L36.6%−5.2 points
201717351.4%4.0 pCi/L32.7 pCi/L38.2%−10.7 points
201613262.1%5.4 pCi/L49.6 pCi/L39.8%+10.9 points
20154151.2%4.3 pCi/L25.0 pCi/L42.3%−8.1 points
20142759.3%4.7 pCi/L21.6 pCi/L43.4%First on file

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

Tooele County, Geology

The ground under Tooele County

Predicted

USGS's geologic map puts all of Tooele County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Basin and Range, to which USGS gives a radon index of 11, in the moderate band (9 to 11).

USGS's geologic areas under Tooele County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Basin and RangeQuaternary sedimentary and igneous rocks.Moderate11100%

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

Tooele County beside the ground around it

Across Utah 32.8% of the land is rated high; none of Tooele County's is. Every one of the 8 counties that border it has more high-potential ground, Weber County the most at 43.3%.

Share of land by USGS radon potential: Tooele County, the 8 counties bordering it and Utah
AreaEPA zoneLow potentialModerate potentialHigh potential
Tooele CountyZone 2None100%None
Davis CountyZone 2None85.9%14.1%
Juab CountyZone 2None81.2%18.8%
Salt Lake CountyZone 2None68.3%31.7%
Box Elder CountyZone 2None97.4%2.6%
Utah CountyZone 2None65.2%34.8%
Weber CountyZone 2None56.7%43.3%
White Pine County, NVZone 1None69.3%30.7%
Elko County, NVZone 2None88.5%11.5%
Utah29 counties, pooled by land areaVariesNone67.2%32.8%

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

Local help

Tooele County, Local resources

Radon testing and mitigation in Tooele 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

Tooele County, Questions

Questions about radon in Tooele County

Are radon levels high in Tooele County?

In 2023, 51.0% of the radon tests reported to CDC for Tooele County, Utah were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.1 pCi/L. Of 22 Utah counties with 30 or more tests for the same period, 10 reported a higher share; pooled, the state comes to 36.1%.

Which counties border Tooele County?

Tooele County borders 8 counties: Davis County, UT, Juab County, UT, Salt Lake County, UT, Box Elder County, UT, Utah County, UT, Weber County, UT, White Pine County, NV and Elko County, NV.

Products

Tooele County, Products

Testing a home in Tooele County

In Tooele County, 51.0% of 573 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 Tooele County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Tooele County homes, compared

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Tooele County, Bordering counties

Counties bordering Tooele County

Calculated by Radon411

Tooele County, Cities and towns

Cities and towns in Tooele County

Tooele County is growing: the Census Bureau puts it at 87,461 residents on July 1, 2025, up 19.2% from 73,349 in 2020. That works out to 13 people per square mile of land. Its largest town, Tooele, has 42,270 residents, 48.3% of the total. Together its 6 incorporated places hold 70.1% of those residents; the other 29.9% live outside any of them. CDC's 573 reported tests for 2023 work out to 6.6 per 1,000 residents (2025 estimate), close to Utah's 7.7.

From Tooele to Vernon, CDC publishes no figure by town: each reads Tooele County's.

The cities and towns in Tooele County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Tooele42,270+17.3%48.3%
Grantsville16,472+29.3%18.8%
Wendover1,135+1.2%1.3%
Stockton621+0.3%0.7%
Rush Valley489+12.9%0.6%
Vernon297+17.9%0.3%

6 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).

Tooele County, Homes

Homes in Tooele County

Tooele County is a place of houses on their own lots: 80% of its 24,138 homes are detached single-family houses, against 67% across Utah. Half of its homes were built before 1997, close to Utah's 1991: 15% date from before 1960 and 44% from 2000 or later. Owners live in 83% of the occupied homes (Utah: 71%), so for most households a test and a fix are their own to order.

Homes in Tooele County, Utah, 2019 to 2023
HomesTooele CountyUtah
Housing units24,1381,193,082
Detached houses80%67%
In buildings of 5 or more6%16%
Mobile homes4%3%
Built before 196015%16%
Built since 200044%37%
Middle year built19971991
Owner-occupied83%71%

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