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Radon Levels in Lincoln County, Wyoming

EPA puts Lincoln County in Zone 1, its highest radon zone, and high results are common there: 68.3% of the 142 radon tests reported to CDC (2008 to 2017, laboratory totals) 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

    68.3%

    24.0 pts above WY

    Lincoln
    68.3%
    Wyoming
    44.3%

    142 tests, 2008 to 2017

  • Median result

    7.8pCi/L

    Action level reached

    Lincoln
    7.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    142

    12th of 22 by tests

    Lincoln
    142
    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

    2 of 22

    Top quarter

    Lincoln
    68.3%
    Sheridan
    69.5%

    By share, of 22 with 30+ tests

Read a result for Lincoln County

Starts at Lincoln County's median, 7.8 pCi/L

7.8pCi/L

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

EPA’s reading of 7.8 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. Lincoln County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Lincoln County, At a glance

Lincoln County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Lincoln 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: Moderate across 62% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Lincoln County, 2008 to 2017, laboratory
Under 2 pCi/L: 14%2 to 4 pCi/L: 18%4 pCi/L and above: 68%

Of 142 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Lincoln County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1913.4%
2 to 4 pCi/L2618.3%
4 pCi/L and above9768.3%
What these figures count

These are the 142 tests reported to CDC for Lincoln 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

Lincoln County, Compared

Lincoln County radon figures, compared

Calculated by Radon411

More than half: 68.3% of the 142 radon tests reported to CDC for Lincoln County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 2nd of 22 Wyoming counties with 30 or more tests for the same period. That is 24.0 points above the 44.3% pooled from 23 Wyoming counties.

The median result, 7.8 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 100.0 pCi/L. The rest split 13.4% under 2 pCi/L and 18.3% from 2 to 4 (Wyoming: 25.5% and 30.2%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 68.3% share point the same way here.

1 of its 7 bordering counties with figures ran higher, led by Bear Lake County, ID at 78.1%; Uinta County reported 24.6%. Statewide for the same period, Sheridan County reported the highest share (69.5%) and Uinta County the lowest (24.6%).

CDC's ten-year totals for Lincoln County went from 156 tests (2005 to 2014) to 142 (2008 to 2017), the share going from 71.2% to 68.3%.

Nationally, every county with a figure for the same period pools to 35.7%; Lincoln County sits 32.6 points above it. CDC also counts 7 tests taken after mitigation in Lincoln County for the same period: tests in homes where a fix was already in.

Lincoln County against Wyoming, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Lincoln County
Lincoln County14268.3%7.8 pCi/LThis county
Wyoming, pooled23 counties, pooled7,63844.3%Not pooled−24.0 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−32.6 points
Sheridan Countyhighest in the state84669.5%5.8 pCi/L+1.2 points
Laramie Countylowest in the state1,83425.5%2.5 pCi/L−42.8 points
Bear Lake County, IDborders it3278.1%7.8 pCi/L+9.8 points
Sublette County, WYborders it6050.0%4.0 pCi/L−18.3 points
Sweetwater County, WYborders it40949.6%3.9 pCi/L−18.7 points
Teton County, WYborders it27844.6%3.4 pCi/L−23.7 points
Caribou County, IDborders it5743.9%3.4 pCi/L−24.4 points
Bonneville County, IDborders it1,11740.1%3.4 pCi/L−28.2 points
Uinta County, WYborders it19924.6%2.2 pCi/L−43.7 points
Rich County, UTborders it20.0%1.4 pCi/L−68.3 points
Where Lincoln County's reported results fell, 2008 to 2017, laboratory, beside Wyoming and the United States
ResultLincoln County testsLincoln County shareWyoming shareU.S. shareAgainst Wyoming
Under 2 pCi/L1913.4%25.5%39.6%−12.1 points
2 to 4 pCi/L2618.3%30.2%24.7%−11.9 points
4 pCi/L and above9768.3%44.3%35.7%+24.0 points
Lincoln 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
Sheridan County1 of 2284669.5%5.8 pCi/L
Lincoln County2 of 2214268.3%7.8 pCi/L
Weston County3 of 223265.6%6.3 pCi/L
Converse County4 of 2213062.3%4.8 pCi/L
Crook County5 of 225158.8%5.1 pCi/L
Hot Springs County6 of 225955.9%4.2 pCi/L
Natrona County7 of 221,05455.7%4.3 pCi/L
Fremont County8 of 2261855.7%4.7 pCi/L
Sublette County9 of 226050.0%4.0 pCi/L
Sweetwater County10 of 2240949.6%3.9 pCi/L
Teton County11 of 2227844.6%3.4 pCi/L
Lincoln County ten-year laboratory totals, against Wyoming's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestWyoming, pooledChange from the row before
2008 to 201714268.3%7.8 pCi/L100.0 pCi/L44.3%−2.1 points
2007 to 201614270.4%8.1 pCi/L100.0 pCi/L44.6%−0.7 points
2006 to 201513571.1%8.0 pCi/L100.0 pCi/L45.3%−0.1 points
2005 to 201415671.2%6.5 pCi/L100.0 pCi/L45.5%First on file

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

Lincoln County, Geology

The ground under Lincoln County

Predicted

USGS's geologic map splits Lincoln County: 62.5% of its land is moderate radon potential and 37.5% high. The map puts 62.5% of Lincoln County in the area it calls Overthrust Belt and 36.2% in Green River Basin, with one smaller area 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 Lincoln County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Overthrust BeltLate Paleozoic sedimentary or Precambrian igneous rocks.Moderate1162.5%
Green River BasinCretaceous and Tertiary uranium-bearing marginal-marine and fluvial sandstones.High1236.2%
Northern Rocky MountainsTertiary sandstone, mudstone, limestone.High131.3%

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

Lincoln County beside the ground around it

Wyoming as a whole has more high-potential ground than Lincoln County: 72.4% of its land, against 37.5% here. Of the 8 counties that border it, 5 have more high-potential ground, Sweetwater County the most at 99.6%.

Share of land by USGS radon potential: Lincoln County, the 8 counties bordering it and Wyoming
AreaEPA zoneLow potentialModerate potentialHigh potential
Lincoln CountyZone 1None62.5%37.5%
Bear Lake County, IDZone 2None96.7%3.3%
Caribou County, IDZone 2None100%None
Sublette CountyZone 1None12.2%87.8%
Rich County, UTZone 2None33.3%66.7%
Uinta CountyZone 1None13.9%86.1%
Bonneville County, IDZone 2None92.4%7.6%
Sweetwater CountyZone 1None0.4%99.6%
Teton CountyZone 1None58.3%41.7%
Wyoming23 counties, pooled by land areaVariesNone27.6%72.4%

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

Local help

Lincoln County, Local resources

Radon testing and mitigation in Lincoln County

What it means

Lincoln County, Questions

Questions about radon in Lincoln County

Are radon levels high in Lincoln County?

Over the 2008 to 2017 laboratory totals, 68.3% of the radon tests reported to CDC for Lincoln County, Wyoming were at or above 4 pCi/L, and the median reported pre-mitigation result was 7.8 pCi/L. Of 22 Wyoming counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 44.3%.

Which counties border Lincoln County?

Lincoln County borders 8 counties: Bear Lake County, ID, Caribou County, ID, Sublette County, WY, Rich County, UT, Uinta County, WY, Bonneville County, ID, Sweetwater County, WY and Teton County, WY.

Products

Lincoln County, Products

Testing a home in Lincoln County

In Lincoln County, 68.3% of 142 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 Lincoln 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

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

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Lincoln County, Bordering counties

Counties bordering Lincoln County

Calculated by Radon411

Lincoln County, Cities and towns

Cities and towns in Lincoln County

Lincoln County is growing: the Census Bureau puts it at 21,180 residents on July 1, 2025, up 7.8% from 19,654 in 2020. Spread over its land, that is 5.2 people to the square mile. No town dominates: Kemmerer, the largest, has 2,353 residents, 11.1% of the total. Together its 9 incorporated places hold 47.0% of those residents; the other 53.0% live outside any of them. Reported testing is thin here: 142 tests over 2008 to 2017, or 6.7 for every 1,000 residents (2025 estimate), where Wyoming as a whole comes to 13.0.

From Kemmerer to Opal, CDC publishes no figure by town: each reads Lincoln County's.

The cities and towns in Lincoln County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Kemmerer2,353−2.6%11.1%
Afton2,256+3.9%10.7%
Star Valley Ranch2,074+10.7%9.8%
Alpine1,382+12.4%6.5%
Diamondville513−1.5%2.4%
Cokeville486−2.6%2.3%
Thayne436+12.1%2.1%
La Barge391−1.3%1.8%
Opal66+3.1%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).

Lincoln County, Homes

Homes in Lincoln County

Lincoln County is a place of houses on their own lots: 77% of its 9,763 homes are detached single-family houses, against 68% across Wyoming. Much of Lincoln County is recent building: 24% of its homes have gone up since 2000 and the middle year built is 1988, against 1980 for Wyoming. Owners live in 80% of the occupied homes (Wyoming: 72%), so for most households a test and a fix are their own to order.

Homes in Lincoln County, Wyoming, 2019 to 2023
HomesLincoln CountyWyoming
Housing units9,763275,131
Detached houses77%68%
In buildings of 5 or more4%9%
Mobile homes13%12%
Built before 196016%24%
Built since 200024%24%
Middle year built19881980
Owner-occupied80%72%

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