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Radon Levels in Utah County, Utah

EPA puts Utah County in Zone 2, its middle radon zone, and high results are common there: 40.6% of the 7,833 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

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  • Share at 4+ pCi/L

    40.6%

    4.5 pts above UT

    Utah
    40.6%
    Utah
    36.1%

    7,833 tests, 2023

  • Median result

    3.2pCi/L

    Below action level

    Utah
    3.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    7,833

    2nd of 22 by tests

    Utah
    7,833
    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

    12 of 22

    Middle half

    Utah
    40.6%
    Beaver
    66.7%

    By share, of 22 with 30+ tests

Read a result for Utah County

Starts at Utah County's median, 3.2 pCi/L

3.2pCi/L

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

EPA’s reading of 3.2 pCi/L

Between 2 and 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 between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Utah County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Utah County, At a glance

Utah County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Utah 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 65% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Utah County, 2023

Share of reported tests at or above 4 pCi/L, by year, Utah County
Share of reported tests at or above 4 pCi/L, by year, Utah County
YearShare of reported tests at or above 4 pCi/L
201444.7%
201546.8%
201644.6%
201739.2%
201839.3%
201936.4%
202038.6%
202129.1%
202242.9%
202340.6%

2023: 40.6%. Across these years the share ran from 29.1% to 46.8%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 7,833 tests reported to CDC for Utah 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

Utah County, Compared

Utah County radon figures, compared

Calculated by Radon411

In Utah County, about 4 in 10 reported tests in 2023 (3,182 of 7,833) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 7.2 points higher. Across 29 Utah counties pooled together, 36.1% of tests reached that level, so Utah County runs 4.5 points above its state.

Of 7 neighbours with a figure, 4 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 23.2% (Carbon County) to 63.3% (Juab County). By share, Utah County is 12th of 22 Utah counties with 30 or more tests for the same period.

Year by year, 2014 opened at 44.7% and 2023 closed at 40.6% (down 4.1 points), with 2015 the high at 46.8%. Half the tests came in under 3.2 pCi/L and half over it; the single highest reached 503.1 pCi/L. Below the action level, 2,316 tests (29.6%) came in under 2 pCi/L, against 35.4% statewide, and 2,335 tests (29.8%) fell between 2 and 4, against 28.5% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 40.6% share point the same way here. USGS geology rates 65% of the county's land moderate radon potential. CDC also counts 1,219 tests taken after mitigation in Utah County for the same period: tests in homes where a fix was already in.

The busiest year on file was 2022, with 10,773 tests reported; the quietest, 2019, had 456.

Share of reported tests at or above 4 pCi/L by year, Utah County against Utah2014 to 2023, years with 30 or more tests: Utah County 44.7% to 40.6%, the state's pooled share 36.1% in 2023.
Utah CountyUtah, pooled
Share of reported tests at or above 4 pCi/L by year, Utah County against Utah: data table
YearTestsUtah County, at or above 4 pCi/LUtah, pooled
201446144.7%43.4%
201592146.8%42.3%
20161,39344.6%39.8%
20171,22939.2%38.2%
201880739.3%36.6%
201945636.4%37.7%
202085438.6%37.6%
20211,29329.1%34.2%
202210,77342.9%37.7%
20237,83340.6%36.1%
Utah County against Utah, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Utah County
Utah County7,83340.6%3.2 pCi/LThis county
Utah, pooled29 counties, pooled27,42236.1%Not pooled−4.5 points
United States, pooled642 counties, pooled128,74033.4%Not pooled−7.2 points
Beaver Countyhighest in the state4266.7%9.3 pCi/L+26.1 points
Washington Countylowest in the state6579.9%1.3 pCi/L−30.7 points
Juab County, UTborders it4963.3%5.0 pCi/L+22.7 points
Sanpete County, UTborders it15060.0%4.6 pCi/L+19.4 points
Wasatch County, UTborders it32451.9%4.2 pCi/L+11.3 points
Tooele County, UTborders it57351.0%4.1 pCi/L+10.4 points
Duchesne County, UTborders it8139.5%3.2 pCi/L−1.1 points
Salt Lake County, UTborders it9,65833.1%2.6 pCi/L−7.5 points
Carbon County, UTborders it6923.2%2.3 pCi/L−17.4 points
Where Utah County's reported results fell, 2023, beside Utah and the United States
ResultUtah County testsUtah County shareUtah shareU.S. shareAgainst Utah
Under 2 pCi/L2,31629.6%35.4%41.4%−5.8 points
2 to 4 pCi/L2,33529.8%28.5%25.2%+1.3 points
4 pCi/L and above3,18240.6%36.1%33.4%+4.5 points
Utah 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
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
Weber County17 of 221,66928.6%2.1 pCi/L
Utah County radon tests by year, against Utah's pooled share
YearTestsAt or above 4 pCi/LMedianHighestUtah, pooledChange from the row before
20237,83340.6%3.2 pCi/L503.1 pCi/L36.1%−2.3 points
202210,77342.9%3.3 pCi/L450.0 pCi/L37.7%+13.8 points
20211,29329.1%2.1 pCi/L80.8 pCi/L34.2%−9.5 points
202085438.6%2.9 pCi/L108.5 pCi/L37.6%+2.2 points
201945636.4%2.8 pCi/L87.6 pCi/L37.7%−2.9 points
201880739.3%2.9 pCi/L119.2 pCi/L36.6%+0.1 points
20171,22939.2%3.2 pCi/L481.4 pCi/L38.2%−5.4 points
20161,39344.6%3.4 pCi/L173.7 pCi/L39.8%−2.2 points
201592146.8%3.7 pCi/L153.9 pCi/L42.3%+2.1 points
201446144.7%3.5 pCi/L178.2 pCi/L43.4%First on file

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

Utah County, Geology

The ground under Utah County

Predicted

USGS's geologic map splits Utah County: 65.2% of its land is moderate radon potential and 34.8% high. The map puts 46.0% of Utah County in the area it calls Basin and Range and 29.6% in Northern High Plateau, with 3 smaller areas beside them. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).

USGS's geologic areas under Utah County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Basin and RangeQuaternary sedimentary and igneous rocks.Moderate1146.0%
Northern High PlateauTertiary and Cretaceous sedimentary rocks.High1229.6%
Uinta MountainsCretaceous marine shales with Tertiary continental sedimentary rocks on the southern flank.Moderate1019.2%
Wasatch RangePrecambrian granite and gneiss and Tertiary igneous rocks that have relatively low uranium concentrations.High142.8%
Uinta BasinUranium-bearing Tertiary sandstone and siltstone.High132.2%

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

Utah County beside the ground around it

On high-potential ground Utah County is close to Utah as a whole: 34.8% of its land against 32.8%. Of the 7 counties that border it, 4 have more high-potential ground, Carbon County the most at 100%.

Share of land by USGS radon potential: Utah County, the 7 counties bordering it and Utah
AreaEPA zoneLow potentialModerate potentialHigh potential
Utah CountyZone 2None65.2%34.8%
Wasatch CountyZone 2None57.8%42.2%
Salt Lake CountyZone 2None68.3%31.7%
Sanpete CountyZone 1NoneNone100%
Duchesne CountyZone 1None29.9%70.1%
Carbon CountyZone 1NoneNone100%
Juab CountyZone 2None81.2%18.8%
Tooele CountyZone 2None100%None
Utah29 counties, pooled by land areaVariesNone67.2%32.8%

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

Local help

Utah County, Local resources

Radon testing and mitigation in Utah 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

Utah County, Questions

Questions about radon in Utah County

Are radon levels high in Utah County?

In 2023, 40.6% of the radon tests reported to CDC for Utah County, Utah were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.2 pCi/L. Of 22 Utah counties with 30 or more tests for the same period, 11 reported a higher share; pooled, the state comes to 36.1%.

Which counties border Utah County?

Utah County borders 7 counties: Wasatch County, Salt Lake County, Sanpete County, Duchesne County, Carbon County, Juab County and Tooele County.

Products

Utah County, Products

Testing a home in Utah County

In Utah County, 40.6% of 7,833 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 Utah County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Utah County homes, compared

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Utah County, Bordering counties

Counties bordering Utah County

Calculated by Radon411

Utah County, Cities and towns

Cities and towns in Utah County

Utah County is growing: the Census Bureau puts it at 759,859 residents on July 1, 2025, up 14.5% from 663,576 in 2020. That works out to 379 people per square mile of land. No town dominates: Provo, the largest, has 114,527 residents, 15.1% of the total. CDC's 7,833 reported tests for 2023 work out to 10.3 per 1,000 residents (2025 estimate), close to Utah's 7.7.

From Provo to Fairfield, CDC publishes no figure by town: each reads Utah County's.

The 12 largest cities and towns in Utah County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Provo114,527−0.5%15.1%
Lehi95,313+24.0%12.5%
Orem95,214−3.2%12.5%
Eagle Mountain66,557+49.6%8.8%
Saratoga Springs61,397+60.2%8.1%
Draperextends beyond Utah County50,652−0.8%Counted whole
Spanish Fork48,837+14.2%6.4%
American Fork41,020+22.2%5.4%
Pleasant Grove37,773+0.1%5.0%
Springville35,670+0.9%4.7%
Payson24,630+15.4%3.2%
Highland21,571+11.2%2.8%
  • Bluffdale (part)
  • Santaquin (part)
  • Mapleton
  • Vineyard
  • Salem
  • Lindon
  • Alpine
  • Cedar Hills
  • Elk Ridge
  • Woodland Hills
  • Genola
  • Goshen
  • Cedar Fort
  • Fairfield

26 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Utah County is counted whole, so it has no share.

Utah County, Homes

Homes in Utah County

Of Utah County's 203,308 homes, 64% are detached houses, against 67% across Utah; 16% are in buildings of five or more homes. Much of Utah County is recent building: 49% of its homes have gone up since 2000 and the middle year built is 1999, against 1991 for Utah. 68% of occupied homes are lived in by their owner (Utah: 71%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Utah County, Utah, 2019 to 2023
HomesUtah CountyUtah
Housing units203,3081,193,082
Detached houses64%67%
In buildings of 5 or more16%16%
Mobile homes1%3%
Built before 196010%16%
Built since 200049%37%
Middle year built19991991
Owner-occupied68%71%

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