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Radon Levels in Uinta County, Wyoming

EPA puts Uinta County in Zone 1, its highest radon zone, and 24.6% of its 199 reported radon tests (2008 to 2017, laboratory totals) were 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

    24.6%

    19.7 pts below WY

    Uinta
    24.6%
    Wyoming
    44.3%

    199 tests, 2008 to 2017

  • Median result

    2.2pCi/L

    Below action level

    Uinta
    2.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    199

    10th of 22 by tests

    Uinta
    199
    Laramie
    1,834

    Reported to CDC before any fix, 2008 to 2017

  • 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 Wyoming

    22 of 22

    Lowest quarter

    Uinta
    24.6%
    Sheridan
    69.5%

    By share, of 22 with 30+ tests

Read a result for Uinta County

Starts at Uinta County's median, 2.2 pCi/L

2.2pCi/L

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

EPA’s reading of 2.2 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. Uinta County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Uinta County, At a glance

Uinta County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Uinta 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 86% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Uinta County, 2008 to 2017, laboratory

Reported results by concentration band, Uinta County, 2008 to 2017, laboratory
Under 2 pCi/L: 43%2 to 4 pCi/L: 32%4 pCi/L and above: 25%

Of 199 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Uinta County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L8643.2%
2 to 4 pCi/L6432.2%
4 pCi/L and above4924.6%
What these figures count

These are the 199 tests reported to CDC for Uinta County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Uinta County, Compared

Uinta County radon figures, compared

Calculated by Radon411

Uinta County's 199 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.2 pCi/L and a maximum of 28.8 pCi/L, and 24.6% reached 4 pCi/L. Wyoming as a whole (23 Wyoming counties, pooled) comes to 44.3%: 19.7 points higher than here.

Among its state's counties it ranks 22nd of 22 Wyoming counties with 30 or more tests for the same period. Statewide for the same period, Sheridan County reported the highest share (69.5%) and Laramie County the lowest (25.5%).

Below the action level, 86 tests (43.2%) came in under 2 pCi/L, against 25.5% statewide, and 64 tests (32.2%) fell between 2 and 4, against 30.2% statewide. CDC's ten-year totals for Uinta County went from 179 tests (2005 to 2014) to 199 (2008 to 2017), the share going from 24.6% to 24.6%.

EPA's 1993 zone map puts Uinta County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 86% of the county's land high radon potential.

Next door, the shares run from 33.1% in Summit County, UT to 68.3% in Lincoln County.

Uinta County against Wyoming, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Uinta County
Uinta County19924.6%2.2 pCi/LThis county
Wyoming, pooled23 counties, pooled7,63844.3%Not pooled+19.7 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+11.1 points
Sheridan Countyhighest in the state84669.5%5.8 pCi/L+44.9 points
Laramie Countylowest in the state1,83425.5%2.5 pCi/L+0.9 points
Lincoln County, WYborders it14268.3%7.8 pCi/L+43.7 points
Sweetwater County, WYborders it40949.6%3.9 pCi/L+25.0 points
Summit County, UTborders it89433.1%2.6 pCi/L+8.5 points
Rich County, UTborders it20.0%1.4 pCi/L−24.6 points
Where Uinta County's reported results fell, 2008 to 2017, laboratory, beside Wyoming and the United States
ResultUinta County testsUinta County shareWyoming shareU.S. shareAgainst Wyoming
Under 2 pCi/L8643.2%25.5%39.6%+17.7 points
2 to 4 pCi/L6432.2%30.2%24.7%+2.0 points
4 pCi/L and above4924.6%44.3%35.7%−19.7 points
Uinta County ranked among the 22 Wyoming counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Campbell County12 of 2227143.9%3.5 pCi/L
Park County13 of 2250542.8%3.4 pCi/L
Big Horn County14 of 229942.4%3.5 pCi/L
Goshen County15 of 2216841.7%3.3 pCi/L
Carbon County16 of 228041.3%3.0 pCi/L
Washakie County17 of 2213038.5%3.2 pCi/L
Johnson County18 of 2213534.8%3.1 pCi/L
Albany County19 of 2239427.9%2.7 pCi/L
Platte County20 of 2213226.5%2.4 pCi/L
Laramie County21 of 221,83425.5%2.5 pCi/L
Uinta County22 of 2219924.6%2.2 pCi/L
Uinta County ten-year laboratory totals, against Wyoming's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestWyoming, pooledChange from the row before
2008 to 201719924.6%2.2 pCi/L28.8 pCi/L44.3%+0.4 points
2007 to 201619424.2%2.1 pCi/L28.8 pCi/L44.6%+0.4 points
2006 to 201518523.8%2.1 pCi/L28.8 pCi/L45.3%−0.8 points
2005 to 201417924.6%2.1 pCi/L28.8 pCi/L45.5%First on file

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

Uinta County, Geology

The ground under Uinta County

Predicted

Most of the ground under Uinta County is one class on USGS's geologic map: 86.1% of its land is high radon potential, with 13.9% moderate. The map puts 85.6% of Uinta County in the area it calls Green River Basin and 13.9% in Overthrust Belt, with one smaller area beside them. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).

USGS's geologic areas under Uinta County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Green River BasinCretaceous and Tertiary uranium-bearing marginal-marine and fluvial sandstones.High1285.6%
Overthrust BeltLate Paleozoic sedimentary or Precambrian igneous rocks.Moderate1113.9%
Northern Rocky MountainsTertiary sandstone, mudstone, limestone.High130.5%

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

Uinta County beside the ground around it

Uinta County has more high-potential ground than Wyoming as a whole: 86.1% of its land against 72.4%. Of the 4 counties that border it, 1 has more high-potential ground, Sweetwater County the most at 99.6%.

Share of land by USGS radon potential: Uinta County, the 4 counties bordering it and Wyoming
AreaEPA zoneLow potentialModerate potentialHigh potential
Uinta CountyZone 1None13.9%86.1%
Rich County, UTZone 2None33.3%66.7%
Summit County, UTZone 2None43.6%56.4%
Lincoln CountyZone 1None62.5%37.5%
Sweetwater CountyZone 1None0.4%99.6%
Wyoming23 counties, pooled by land areaVariesNone27.6%72.4%

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

Local help

Uinta County, Local resources

Radon testing and mitigation in Uinta County

What it means

Uinta County, Questions

Questions about radon in Uinta County

Are radon levels high in Uinta County?

Over the 2008 to 2017 laboratory totals, 24.6% of the radon tests reported to CDC for Uinta County, Wyoming were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.2 pCi/L. Of 22 Wyoming counties with 30 or more tests for the same period, 21 reported a higher share; pooled, the state comes to 44.3%.

Which counties border Uinta County?

Uinta County borders 4 counties: Rich County, UT, Summit County, UT, Lincoln County, WY and Sweetwater County, WY.

Products

Uinta County, Products

Testing a home in Uinta County

In Uinta County, 24.6% of 199 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 44.3% pooled across Wyoming. In Zone 1 the year-round level in Uinta 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

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

Explore

Uinta County, Bordering counties

Counties bordering Uinta County

Calculated by Radon411

Uinta County, Cities and towns

Cities and towns in Uinta County

The Census Bureau estimates 20,728 residents in Uinta County for July 1, 2025, 266 more than in 2020 (+1.3%). Spread over its land, that is 10.0 people to the square mile. Evanston alone is home to 11,705 of them, 56.5% of the total. Together its 4 incorporated places hold 75.8% of those residents; the other 24.2% live outside any of them. CDC's 199 reported tests for 2008 to 2017 work out to 9.6 per 1,000 residents (2025 estimate), close to Wyoming's 13.0.

From Evanston to Bear River, CDC publishes no figure by town: each reads Uinta County's.

The cities and towns in Uinta County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Evanston11,705−0.6%56.5%
Lyman2,216+3.6%10.7%
Mountain View1,264−1.1%6.1%
Bear River524+0.8%2.5%

4 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).

Uinta County, Homes

Homes in Uinta County

Of Uinta County's 8,868 homes, 61% are detached houses, against 68% across Wyoming; 19% are mobile homes. Half of its homes were built before 1984, close to Wyoming's 1980: 18% date from before 1960 and 15% from 2000 or later. Owners live in 77% of the occupied homes (Wyoming: 72%), so for most households a test and a fix are their own to order.

Homes in Uinta County, Wyoming, 2019 to 2023
HomesUinta CountyWyoming
Housing units8,868275,131
Detached houses61%68%
In buildings of 5 or more10%9%
Mobile homes19%12%
Built before 196018%24%
Built since 200015%24%
Middle year built19841980
Owner-occupied77%72%

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