Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Washakie County, Wyoming
EPA puts Washakie County in Zone 1, its highest radon zone, and 38.5% of its 130 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
Share at 4+ pCi/L
38.5%
5.8 pts below WY
- Washakie
- 38.5%
- Wyoming
- 44.3%
130 tests, 2008 to 2017
Median result
3.2pCi/L
Below action level
- Washakie
- 3.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
130
16th of 22 by tests
- Washakie
- 130
- 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
17 of 22
Middle half
- Washakie
- 38.5%
- Sheridan
- 69.5%
By share, of 22 with 30+ tests
Read a result for Washakie County
Starts at Washakie County's median, 3.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.2 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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. Washakie County's median reported result, 2008 to 2017.
The data
Washakie County, At a glance
Washakie County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Washakie County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Washakie County, 2008 to 2017, laboratory
Under 2 pCi/L: 26%2 to 4 pCi/L: 35%4 pCi/L and above: 39%
Of 130 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 34 | 26.2% |
| 2 to 4 pCi/L | 46 | 35.4% |
| 4 pCi/L and above | 50 | 38.5% |
What these figures count
These are the 130 tests reported to CDC for Washakie 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).
Washakie County, Compared
Washakie County radon figures, compared
Calculated by Radon411In Washakie County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (50 of 130) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 2.8 points higher. Across 23 Wyoming counties pooled together, 44.3% of tests reached that level, so Washakie County runs 5.8 points below its state.
Of 6 neighbours with a figure, 5 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 34.8% (Johnson County) to 55.9% (Hot Springs County). By share, Washakie County is 17th of 22 Wyoming counties with 30 or more tests for the same period.
Half the tests came in under 3.2 pCi/L and half over it; the single highest reached 15.9 pCi/L. Below the action level, 34 tests (26.2%) came in under 2 pCi/L, against 25.5% statewide, and 46 tests (35.4%) fell between 2 and 4, against 30.2% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 38.5% share point the same way here. USGS geology rates 100% of the county's land high radon potential.
CDC's ten-year totals for Washakie County went from 152 tests (2005 to 2014) to 130 (2008 to 2017), the share going from 34.9% to 38.5%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Washakie County, Geology
The ground under Washakie County
PredictedUSGS's geologic map puts all of Washakie County's mapped land in one class: high radon potential. The map puts 72.3% of Washakie County in the area it calls Big Horn Basin and 27.7% in Big Horn Mountains. 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 |
|---|---|---|---|---|
| Big Horn Basin | Cretaceous and Tertiary uranium-bearing marginal-marine and fluvial sandstones. | High | 12 | 72.3% |
| Big Horn Mountains | Precambrian granitic and metamorphic rocks locally overlain by marine clastic and carbonate sedimentary rocks. | High | 12 | 27.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Washakie County beside the ground around it
Washakie County has more high-potential ground than Wyoming as a whole: 100% of its land against 72.4%. Of the 6 counties that border it, none has as large a share of high-potential ground; Big Horn County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Washakie County, Local resources
Radon testing and mitigation in Washakie 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
Washakie County, Questions
Questions about radon in Washakie County
Are radon levels high in Washakie County?
Over the 2008 to 2017 laboratory totals, 38.5% of the radon tests reported to CDC for Washakie County, Wyoming were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.2 pCi/L. Of 22 Wyoming counties with 30 or more tests for the same period, 16 reported a higher share; pooled, the state comes to 44.3%.
Which counties border Washakie County?
Washakie County borders 6 counties: Hot Springs County, Big Horn County, Johnson County, Fremont County, Natrona County and Park County.
Products
Washakie County, Products
Testing a home in Washakie County
In Washakie County, 38.5% of 130 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 Washakie 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
Monitor
EcoQube Flex battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 15 minutes
Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Washakie County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Washakie County
Explore
Washakie County, Bordering counties
Counties bordering Washakie County
Calculated by Radon411- Radon levels in Hot Springs CountyEPA zone 1
55.9%at or above 4 pCi/L
Median 4.2 pCi/L · 59 tests · 17.4 points above Washakie County
- Radon levels in Fremont CountyEPA zone 1
55.7%at or above 4 pCi/L
Median 4.7 pCi/L · 618 tests · 17.2 points above Washakie County
- Radon levels in Natrona CountyEPA zone 1
55.7%at or above 4 pCi/L
Median 4.3 pCi/L · 1,054 tests · 17.2 points above Washakie County
- Radon levels in Park CountyEPA zone 1
42.8%at or above 4 pCi/L
Median 3.4 pCi/L · 505 tests · 4.3 points above Washakie County
- Radon levels in Big Horn CountyEPA zone 1
42.4%at or above 4 pCi/L
Median 3.5 pCi/L · 99 tests · 3.9 points above Washakie County
- Radon levels in Johnson CountyEPA zone 1
34.8%at or above 4 pCi/L
Median 3.1 pCi/L · 135 tests · 3.7 points below Washakie County
Washakie County, Cities and towns
Cities and towns in Washakie County
About 7,597 people live in Washakie County by the Census Bureau's estimate for July 1, 2025, 62 fewer than in 2020 (−0.8%). Spread over its land, that is 3.4 people to the square mile. Worland alone is home to 4,730 of them, 62.3% of the total. Together its 2 incorporated places hold 65.7% of those residents; the other 34.3% live outside any of them. CDC's 130 reported tests for 2008 to 2017 work out to 17.1 per 1,000 residents (2025 estimate), close to Wyoming's 13.0.
From Worland to Ten Sleep, CDC publishes no figure by town: each reads Washakie County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Worland | 4,730 | −0.9% | 62.3% |
| Ten Sleep | 260 | +3.6% | 3.4% |
2 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).
Washakie County, Homes
Homes in Washakie County
Washakie County is a place of houses on their own lots: 80% of its 3,850 homes are detached single-family houses, against 68% across Wyoming. The homes are older than Wyoming's as a whole: half were built before 1972 (1980 for Wyoming), and 40% date from before 1960. 74% 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 | Washakie County | Wyoming |
|---|---|---|
| Housing units | 3,850 | 275,131 |
| Detached houses | 80% | 68% |
| In buildings of 5 or more | 4% | 9% |
| Mobile homes | 8% | 12% |
| Built before 1960 | 40% | 24% |
| Built since 2000 | 13% | 24% |
| Middle year built | 1972 | 1980 |
| Owner-occupied | 74% | 72% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.