Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Sublette County, Wyoming
EPA puts Sublette County in Zone 1, its highest radon zone, and high results are common there: 50.0% of the 60 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
Share at 4+ pCi/L
50.0%
5.7 pts above WY
- Sublette
- 50.0%
- Wyoming
- 44.3%
60 tests, 2008 to 2017
Median result
4.0pCi/L
Action level reached
- Sublette
- 4.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
60
19th of 22 by tests
- Sublette
- 60
- Laramie
- 1,834
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Wyoming
9 of 22
Middle half
- Sublette
- 50.0%
- Sheridan
- 69.5%
By share, of 22 with 30+ tests
Read a result for Sublette County
Starts at Sublette County's median, 4.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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. Sublette County's median reported result, 2008 to 2017.
The data
Sublette County, At a glance
Sublette County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Sublette County in
USGS geologic potential: High across 88% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Sublette County, 2008 to 2017, laboratory
Under 2 pCi/L: 28%2 to 4 pCi/L: 22%4 pCi/L and above: 50%
Of 60 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 17 | 28.3% |
| 2 to 4 pCi/L | 13 | 21.7% |
| 4 pCi/L and above | 30 | 50.0% |
What these figures count
These are the 60 tests reported to CDC for Sublette 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).
Sublette County, Compared
Sublette County radon figures, compared
Calculated by Radon411More than half: 50.0% of the 60 radon tests reported to CDC for Sublette County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 9th of 22 Wyoming counties with 30 or more tests for the same period. That is 5.7 points above the 44.3% pooled from 23 Wyoming counties.
The median result, 4.0 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 26.3 pCi/L. The rest split 28.3% under 2 pCi/L and 21.7% from 2 to 4 (Wyoming: 25.5% and 30.2%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 50.0% share point the same way here.
2 of its 4 bordering counties with figures ran higher, led by Lincoln County at 68.3%; Teton County reported 44.6%. 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 Sublette County went from 54 tests (2005 to 2014) to 60 (2008 to 2017), the share going from 46.3% to 50.0%.
Nationally, every county with a figure for the same period pools to 35.7%; Sublette County sits 14.3 points above it.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Sublette County, Geology
The ground under Sublette County
PredictedMost of the ground under Sublette County is one class on USGS's geologic map: 87.8% of its land is high radon potential, with 12.2% moderate. The map puts 62.9% of Sublette County in the area it calls Green River Basin and 24.9% in Wind River Mountains, with one smaller area beside them. USGS gives both a radon index of 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Green River Basin | Cretaceous and Tertiary uranium-bearing marginal-marine and fluvial sandstones. | High | 12 | 62.9% |
| Wind River Mountains | Precambrian granite, glacial till in valleys. | High | 12 | 24.9% |
| Overthrust Belt | Late Paleozoic sedimentary or Precambrian igneous rocks. | Moderate | 11 | 12.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Sublette County beside the ground around it
Sublette County has more high-potential ground than Wyoming as a whole: 87.8% of its land against 72.4%. Of the 4 counties that border it, 2 have more high-potential ground, Sweetwater County the most at 99.6%.
The map rates the ground, not the air in any home.
Local help
Sublette County, Local resources
Radon testing and mitigation in Sublette County
- Wyoming Radon ProgramWyoming Radon Program, run by Wyoming Department of Health, answers questions about testing, mitigation and the rules in Wyoming.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Wyoming2 professionals are listed in Wyoming.
What it means
Sublette County, Questions
Questions about radon in Sublette County
Are radon levels high in Sublette County?
Over the 2008 to 2017 laboratory totals, 50.0% of the radon tests reported to CDC for Sublette County, Wyoming were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.0 pCi/L. Of 22 Wyoming counties with 30 or more tests for the same period, 8 reported a higher share; pooled, the state comes to 44.3%.
Which counties border Sublette County?
Sublette County borders 4 counties: Lincoln County, Fremont County, Teton County and Sweetwater County.
Products
Sublette County, Products
Testing a home in Sublette County
In Sublette County, 50.0% of 60 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 Sublette 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
MonitorAEGTEST
HOUND-1085 palm-sized rechargeable radon detector
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Sublette County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Sublette County
Explore
Sublette County, Bordering counties
Counties bordering Sublette County
Calculated by Radon411- Radon levels in Lincoln CountyEPA zone 1
68.3%at or above 4 pCi/L
Median 7.8 pCi/L · 142 tests · 18.3 points above Sublette County
- Radon levels in Fremont CountyEPA zone 1
55.7%at or above 4 pCi/L
Median 4.7 pCi/L · 618 tests · 5.7 points above Sublette County
- Radon levels in Sweetwater CountyEPA zone 1
49.6%at or above 4 pCi/L
Median 3.9 pCi/L · 409 tests · 0.4 points below Sublette County
- Radon levels in Teton CountyEPA zone 1
44.6%at or above 4 pCi/L
Median 3.4 pCi/L · 278 tests · 5.4 points below Sublette County
Sublette County, Cities and towns
Cities and towns in Sublette County
The Census Bureau estimates 8,929 residents in Sublette County for July 1, 2025, 189 more than in 2020 (+2.2%). Spread over its land, that is 1.8 people to the square mile. Its largest town, Pinedale, has 1,997 residents, 22.4% of the total. Together its 3 incorporated places hold 35.9% of those residents; the other 64.1% live outside any of them. Reported testing is thin here: 60 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 Pinedale to Big Piney, CDC publishes no figure by town: each reads Sublette County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Pinedale | 1,997 | −0.9% | 22.4% |
| Marbleton | 824 | −3.5% | 9.2% |
| Big Piney | 385 | −4.2% | 4.3% |
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).
Sublette County, Homes
Homes in Sublette County
Sublette County is a place of houses on their own lots: 82% of its 5,239 homes are detached single-family houses, against 68% across Wyoming. Half of its homes were built before 1984, close to Wyoming's 1980: 21% date from before 1960 and 25% from 2000 or later. Owners live in 81% of the occupied homes (Wyoming: 72%), so for most households a test and a fix are their own to order.
| Homes | Sublette County | Wyoming |
|---|---|---|
| Housing units | 5,239 | 275,131 |
| Detached houses | 82% | 68% |
| In buildings of 5 or more | 3% | 9% |
| Mobile homes | 10% | 12% |
| Built before 1960 | 21% | 24% |
| Built since 2000 | 25% | 24% |
| Middle year built | 1984 | 1980 |
| Owner-occupied | 81% | 72% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.