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Radon Levels in Teton County, Wyoming

EPA puts Teton County in Zone 1, its highest radon zone, and high results are common there: 44.6% of the 278 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    44.6%

    0.3 pts above WY

    Teton
    44.6%
    Wyoming
    44.3%

    278 tests, 2008 to 2017

  • Median result

    3.4pCi/L

    Below action level

    Teton
    3.4 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    278

    8th of 22 by tests

    Teton
    278
    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

    11 of 22

    Middle half

    Teton
    44.6%
    Sheridan
    69.5%

    By share, of 22 with 30+ tests

Read a result for Teton County

Starts at Teton County's median, 3.4 pCi/L

3.4pCi/L

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

EPA’s reading of 3.4 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. Teton County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Teton County, At a glance

Teton County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Teton 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 58% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Teton County, 2008 to 2017, laboratory
Under 2 pCi/L: 33%2 to 4 pCi/L: 23%4 pCi/L and above: 44%

Of 278 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Teton County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L9132.7%
2 to 4 pCi/L6322.7%
4 pCi/L and above12444.6%
What these figures count

These are the 278 tests reported to CDC for Teton 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

Teton County, Compared

Teton County radon figures, compared

Calculated by Radon411

In Teton County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (124 of 278) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 8.9 points higher. Across 23 Wyoming counties pooled together, 44.3% of tests reached that level, so Teton County runs 0.3 points above its state.

Of 8 neighbours with a figure, 5 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 40.1% (Bonneville County, ID) to 68.3% (Lincoln County). By share, Teton County is 11th of 22 Wyoming counties with 30 or more tests for the same period.

Half the tests came in under 3.4 pCi/L and half over it; the single highest reached 59.6 pCi/L. Below the action level, 91 tests (32.7%) came in under 2 pCi/L, against 25.5% statewide, and 63 tests (22.7%) fell between 2 and 4, against 30.2% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 44.6% share point the same way here. USGS geology rates 58% of the county's land moderate radon potential. CDC also counts 8 tests taken after mitigation in Teton County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Teton County went from 198 tests (2005 to 2014) to 278 (2008 to 2017), the share going from 45.5% to 44.6%.

Teton County against Wyoming, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Teton County
Teton County27844.6%3.4 pCi/LThis county
Wyoming, pooled23 counties, pooled7,63844.3%Not pooled−0.3 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−8.9 points
Sheridan Countyhighest in the state84669.5%5.8 pCi/L+24.9 points
Uinta Countylowest in the state19924.6%2.2 pCi/L−20.0 points
Lincoln County, WYborders it14268.3%7.8 pCi/L+23.7 points
Fremont County, WYborders it61855.7%4.7 pCi/L+11.1 points
Teton County, IDborders it47353.3%4.4 pCi/L+8.7 points
Sublette County, WYborders it6050.0%4.0 pCi/L+5.4 points
Fremont County, IDborders it10149.5%3.9 pCi/L+4.9 points
Park County, WYborders it50542.8%3.4 pCi/L−1.8 points
Gallatin County, MTborders it1,60042.8%3.2 pCi/L−1.8 points
Bonneville County, IDborders it1,11740.1%3.4 pCi/L−4.5 points
Where Teton County's reported results fell, 2008 to 2017, laboratory, beside Wyoming and the United States
ResultTeton County testsTeton County shareWyoming shareU.S. shareAgainst Wyoming
Under 2 pCi/L9132.7%25.5%39.6%+7.2 points
2 to 4 pCi/L6322.7%30.2%24.7%−7.5 points
4 pCi/L and above12444.6%44.3%35.7%+0.3 points
Teton 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
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
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
Teton County ten-year laboratory totals, against Wyoming's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestWyoming, pooledChange from the row before
2008 to 201727844.6%3.4 pCi/L59.6 pCi/L44.3%−1.0 points
2007 to 201625045.6%3.4 pCi/L67.8 pCi/L44.6%−2.6 points
2006 to 201519748.2%3.9 pCi/L67.8 pCi/L45.3%+2.7 points
2005 to 201419845.5%3.6 pCi/L67.8 pCi/L45.5%First on file

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

Teton County, Geology

The ground under Teton County

Predicted

USGS's geologic map splits Teton County: 58.3% of its land is moderate radon potential and 41.7% high. The map puts 50.4% of Teton County in the area it calls Overthrust Belt and 29.9% in Yellowstone Volcanic Field, with 4 smaller areas beside them. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 13, in the high band (12 to 17).

USGS's geologic areas under Teton County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Overthrust BeltLate Paleozoic sedimentary or Precambrian igneous rocks.Moderate1150.4%
Yellowstone Volcanic FieldBasalt and rhyolite flows and tuffs.High1329.9%
Teton RangePrecambrian granite, diabase, and gneiss, Paleozoic marine sedimentary rocks.High128.6%
Absaroka Volcanic FieldIntrusive and extrusive volcanic rocks and overlying sediments.Moderate107.8%
Green River BasinCretaceous and Tertiary uranium-bearing marginal-marine and fluvial sandstones.High121.5%
Wind River BasinCretaceous and Tertiary uranium-bearing marginal-marine and fluvial sandstones.High121.5%

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

Teton County beside the ground around it

Wyoming as a whole has more high-potential ground than Teton County: 72.4% of its land, against 41.7% here. Of the 8 counties that border it, 5 have more high-potential ground, Fremont County the most at 92.7%.

Share of land by USGS radon potential: Teton County, the 8 counties bordering it and Wyoming
AreaEPA zoneLow potentialModerate potentialHigh potential
Teton CountyZone 1None58.3%41.7%
Teton County, IDZone 2None60.3%39.7%
Fremont County, IDZone 1None31.8%68.2%
Bonneville County, IDZone 2None92.4%7.6%
Park CountyZone 1None51.9%48.1%
Sublette CountyZone 1None12.2%87.8%
Gallatin County, MTZone 1None21.0%79.0%
Lincoln CountyZone 1None62.5%37.5%
Fremont CountyZone 1None7.3%92.7%
Wyoming23 counties, pooled by land areaVariesNone27.6%72.4%

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

Local help

Teton County, Local resources

Radon testing and mitigation in Teton County

What it means

Teton County, Questions

Questions about radon in Teton County

Are radon levels high in Teton County?

Over the 2008 to 2017 laboratory totals, 44.6% of the radon tests reported to CDC for Teton County, Wyoming were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.4 pCi/L. Of 22 Wyoming counties with 30 or more tests for the same period, 10 reported a higher share; pooled, the state comes to 44.3%.

Which counties border Teton County?

Teton County borders 8 counties: Teton County, ID, Fremont County, ID, Bonneville County, ID, Park County, WY, Sublette County, WY, Gallatin County, MT, Lincoln County, WY and Fremont County, WY.

Products

Teton County, Products

Testing a home in Teton County

In Teton County, 44.6% of 278 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 Teton 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

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

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Teton County, Bordering counties

Counties bordering Teton County

Calculated by Radon411

Teton County, Cities and towns

Cities and towns in Teton County

Teton County's population has barely moved since 2020: 23,333 residents on July 1, 2025 against 23,381 then, by the Census Bureau's estimates. Spread over its land, that is 5.8 people to the square mile. Jackson, its one incorporated place, has 10,720 residents, 45.9% of the total. CDC's 278 reported tests for 2008 to 2017 work out to 11.9 per 1,000 residents (2025 estimate), close to Wyoming's 13.0.

Jackson is the one incorporated place here; CDC publishes no figure by town, so it reads Teton County's.

Jackson, Teton County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Jackson10,720−0.8%45.9%

One incorporated place, 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).

Teton County, Homes

Homes in Teton County

Of Teton County's 13,503 homes, 62% are detached houses, against 68% across Wyoming; 15% are in buildings of five or more homes. Much of Teton County is recent building: 25% of its homes have gone up since 2000 and the middle year built is 1989, against 1980 for Wyoming. 62% of occupied homes are lived in by their owner (Wyoming: 72%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Teton County, Wyoming, 2019 to 2023
HomesTeton CountyWyoming
Housing units13,503275,131
Detached houses62%68%
In buildings of 5 or more15%9%
Mobile homes3%12%
Built before 196011%24%
Built since 200025%24%
Middle year built19891980
Owner-occupied62%72%

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