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Radon Levels in Uintah County, Utah

EPA puts Uintah County in Zone 1, its highest radon zone, and high results are common there: 51.0% of the 104 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

    51.0%

    14.9 pts above UT

    Uintah
    51.0%
    Utah
    36.1%

    104 tests, 2023

  • Median result

    4.2pCi/L

    Action level reached

    Uintah
    4.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    104

    14th of 22 by tests

    Uintah
    104
    Salt Lake
    9,658

    Reported to CDC before any fix, 2023

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Utah

    10 of 22

    Middle half

    Uintah
    51.0%
    Beaver
    66.7%

    By share, of 22 with 30+ tests

Read a result for Uintah County

Starts at Uintah 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. Uintah County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Uintah County, At a glance

Uintah County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Uintah County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 70% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Uintah County, 2023

Share of reported tests at or above 4 pCi/L, by year, Uintah County
Share of reported tests at or above 4 pCi/L, by year, Uintah County
YearShare of reported tests at or above 4 pCi/L
201457.1%
201534.2%
201621.5%
201744.7%
201846.5%
201973.1%
202045.8%
202146.1%
202245.9%
202351.0%

2023: 51.0%. Across these years the share ran from 21.5% to 73.1%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 104 tests reported to CDC for Uintah 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

Uintah County, Compared

Uintah County radon figures, compared

Calculated by Radon411

More than half: 51.0% of the 104 radon tests reported to CDC for Uintah County in 2023 read at least 4 pCi/L. That places it 10th 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, 4.2 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 77.2 pCi/L. The rest split 22.1% under 2 pCi/L and 26.9% from 2 to 4 (Utah: 35.4% and 28.5%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 51.0% share point the same way here.

No bordering county with a figure for the same period reported a higher share; the closest is Duchesne County at 39.5%, the lowest Carbon County at 23.2%. 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 294 tests reported; the quietest, 2014, had 14.

Over 8 years of annual figures the share rose 16.8 points, from 34.2% in 2015 to 51.0% in 2023; its peak was 51.0% in 2023. Nationally, every county with a figure for the same period pools to 33.4%; Uintah County sits 17.6 points above it. CDC also counts 9 tests taken after mitigation in Uintah 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, Uintah County against Utah2015 to 2023, years with 30 or more tests: Uintah County 34.2% to 51.0%, the state's pooled share 36.1% in 2023.
Uintah CountyUtah, pooled
Share of reported tests at or above 4 pCi/L by year, Uintah County against Utah: data table
YearTestsUintah County, at or above 4 pCi/LUtah, pooled
20157334.2%42.3%
20166521.5%39.8%
20174744.7%38.2%
20184346.5%36.6%
20204845.8%37.6%
20217646.1%34.2%
202229445.9%37.7%
202310451.0%36.1%
Uintah County against Utah, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Uintah County
Uintah County10451.0%4.2 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
Daggett County, UTborders it450.0%6.3 pCi/L−1.0 points
Duchesne County, UTborders it8139.5%3.2 pCi/L−11.5 points
Garfield County, COborders it22439.3%2.9 pCi/L−11.7 points
Emery County, UTborders it3938.5%2.7 pCi/L−12.5 points
Moffat County, COborders it1330.8%2.4 pCi/L−20.2 points
Grand County, UTborders it4623.9%1.9 pCi/L−27.1 points
Carbon County, UTborders it6923.2%2.3 pCi/L−27.8 points
Rio Blanco County, COborders it1520.0%1.9 pCi/L−31.0 points
Where Uintah County's reported results fell, 2023, beside Utah and the United States
ResultUintah County testsUintah County shareUtah shareU.S. shareAgainst Utah
Under 2 pCi/L2322.1%35.4%41.4%−13.3 points
2 to 4 pCi/L2826.9%28.5%25.2%−1.6 points
4 pCi/L and above5351.0%36.1%33.4%+14.9 points
Uintah 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
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
Salt Lake County15 of 229,65833.1%2.6 pCi/L
Uintah County radon tests by year, against Utah's pooled share
YearTestsAt or above 4 pCi/LMedianHighestUtah, pooledChange from the row before
202310451.0%4.2 pCi/L77.2 pCi/L36.1%+5.1 points
202229445.9%3.7 pCi/L27.6 pCi/L37.7%−0.2 points
20217646.1%3.7 pCi/L50.3 pCi/L34.2%+0.3 points
20204845.8%3.6 pCi/L43.4 pCi/L37.6%−27.3 points
20192673.1%4.6 pCi/L14.3 pCi/L37.7%+26.6 points
20184346.5%3.7 pCi/L40.5 pCi/L36.6%+1.8 points
20174744.7%3.4 pCi/L22.9 pCi/L38.2%+23.2 points
20166521.5%1.5 pCi/L11.0 pCi/L39.8%−12.7 points
20157334.2%2.4 pCi/L40.5 pCi/L42.3%−22.9 points
20141457.1%4.9 pCi/L20.1 pCi/L43.4%First on file

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

Uintah County, Geology

The ground under Uintah County

Predicted

USGS's geologic map splits Uintah County: 69.5% of its land is high radon potential and 30.5% moderate. The map puts 69.5% of Uintah County in the area it calls Uinta Basin and 30.4% in Uinta Mountains. USGS gives the first a radon index of 13, in the high band (12 to 17), and the second 10, in the moderate band (9 to 11).

USGS's geologic areas under Uintah County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Uinta BasinUranium-bearing Tertiary sandstone and siltstone.High1369.5%
Uinta MountainsCretaceous marine shales with Tertiary continental sedimentary rocks on the southern flank.Moderate1030.4%

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

Uintah County beside the ground around it

Uintah County has more high-potential ground than Utah as a whole: 69.5% of its land against 32.8%. Of the 8 counties that border it, 2 have more high-potential ground, Carbon County the most at 100%.

Share of land by USGS radon potential: Uintah County, the 8 counties bordering it and Utah
AreaEPA zoneLow potentialModerate potentialHigh potential
Uintah CountyZone 1None30.5%69.5%
Duchesne CountyZone 1None29.9%70.1%
Daggett CountyZone 2None93.7%6.3%
Carbon CountyZone 1NoneNone100%
Grand CountyZone 1None32.1%67.9%
Rio Blanco County, COZone 1None31.8%68.2%
Moffat County, COZone 1None38.6%61.4%
Emery CountyZone 2None56.3%43.7%
Garfield County, COZone 1None42.5%57.5%
Utah29 counties, pooled by land areaVariesNone67.2%32.8%

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

Local help

Uintah County, Local resources

Radon testing and mitigation in Uintah 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

Uintah County, Questions

Questions about radon in Uintah County

Are radon levels high in Uintah County?

In 2023, 51.0% of the radon tests reported to CDC for Uintah 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, 9 reported a higher share; pooled, the state comes to 36.1%.

Which counties border Uintah County?

Uintah County borders 8 counties: Duchesne County, UT, Daggett County, UT, Carbon County, UT, Grand County, UT, Rio Blanco County, CO, Moffat County, CO, Emery County, UT and Garfield County, CO.

Products

Uintah County, Products

Testing a home in Uintah County

In Uintah County, 51.0% of 104 tests reported to CDC in 2023 reached 4 pCi/L, against 36.1% pooled across Utah. In Zone 1 the year-round level in Uintah County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Uintah County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Uintah County

Explore

Uintah County, Bordering counties

Counties bordering Uintah County

Calculated by Radon411

Uintah County, Cities and towns

Cities and towns in Uintah County

Uintah County is growing: the Census Bureau puts it at 38,278 residents on July 1, 2025, up 7.3% from 35,676 in 2020. Spread over its land, that is 8.5 people to the square mile. Its largest town, Vernal, has 10,671 residents, 27.9% of the total. Together its 3 incorporated places hold 37.8% of those residents; the other 62.2% live outside any of them. Reported testing is thin here: 104 tests over 2023, or 2.7 for every 1,000 residents (2025 estimate), where Utah as a whole comes to 7.7.

From Vernal to Ballard, CDC publishes no figure by town: each reads Uintah County's.

The cities and towns in Uintah County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Vernal10,671+5.8%27.9%
Naples2,488+9.3%6.5%
Ballard1,303+15.4%3.4%

3 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).

Uintah County, Homes

Homes in Uintah County

Of Uintah County's 13,775 homes, 71% are detached houses, against 67% across Utah; 11% are mobile homes. Half of its homes were built before 1988, close to Utah's 1991: 11% date from before 1960 and 40% from 2000 or later. 72% 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 Uintah County, Utah, 2019 to 2023
HomesUintah CountyUtah
Housing units13,7751,193,082
Detached houses71%67%
In buildings of 5 or more8%16%
Mobile homes11%3%
Built before 196011%16%
Built since 200040%37%
Middle year built19881991
Owner-occupied72%71%

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