Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Wheatland County, Montana
EPA puts Wheatland County in Zone 2, its middle radon zone, and only 1 radon test from it is on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
72.2%
Fergus County
- Fergus
- 72.2%
- Judith Basin
- 64.3%
2 of 5 neighbours have 30+ tests, 2006 to 2015
Nearest county
64.3%
Judith Basin County, 45 miles
- Judith Basin
- 64.3%
- Montana
- 47.4%
Share at 4+ pCi/L, 42 tests, 2006 to 2015
Ground above low
100.0%
Level with Montana
- Wheatland
- 100.0%
- Montana
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
3
Too few for a share
- Wheatland
- 3
- Needed
- 30
2007 to 2016, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Wheatland County
Starts at EPA's action level
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.
The data
Wheatland County, At a glance
Wheatland County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Wheatland County is a
USGS geologic potential: Moderate across 91% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Wheatland County, 2008 to 2017, laboratory
CDC holds 1 reported test for Wheatland County over the 2008 to 2017 laboratory totals, a result of 12.8 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Wheatland County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Wheatland County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Wheatland County, Compared
Wheatland County radon figures, compared
Calculated by Radon411CDC's largest figure for Wheatland County rests on 3 tests over the 2007 to 2016 laboratory totals, 2 of them at or above 4 pCi/L, so each test moves its share by 33.3 points and no rank or comparison is drawn from it. Results reached as high as 12.8 pCi/L, with a middle value of 7.2 pCi/L.
Of the counties bordering it, 2 have a figure over the 2006 to 2015 laboratory totals: Fergus County reported the largest share at or above 4 pCi/L, 72.2%, and Judith Basin County the smallest, 64.3%. Farther out, Stillwater County (59 miles away) at 61.8%, Park County (75 miles away) at 57.9% and Yellowstone County (84 miles away) at 43.1% have figures too. Pooled across 52 Montana counties, 47.4% of reported tests reached that level; across every county in the country with a figure, 36.3%.
Statewide for the same period, Sheridan County reported the highest share (75.7%) and Hill County the lowest (35.0%). EPA's 1993 map puts Wheatland County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 91% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Wheatland County, Geology
The ground under Wheatland County
PredictedMost of the ground under Wheatland County is one class on USGS's geologic map: 91.4% of its land is moderate radon potential, with 8.6% high. The map puts 91.4% of Wheatland County in the area it calls Plains and Mountains and 8.6% in Northern Rocky Mountains. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Plains and Mountains | Marine and continental shale, siltstone, and sandstone of Cretaceous and Tertiary ages, and volcanic rocks. | Moderate | 10 | 91.4% |
| Northern Rocky Mountains | Granitic, metaigneous, metasedimentary rocks, valley fill colluvium and alluvium. | High | 13 | 8.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Wheatland County beside the ground around it
Montana as a whole has more high-potential ground than Wheatland County: 78.5% of its land, against 8.6% here. Of the 5 counties that border it, 3 have more high-potential ground, Meagher County the most at 78.3%.
The map rates the ground, not the air in any home.
Local help
Wheatland County, Local resources
Radon testing and mitigation in Wheatland County
- Radon Control ProgramRadon Control Program, run by Montana DEQ, does not license radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Montana.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Energy Bureau staff manage the radon information toll-free hotline and distribute subsidized radon test kits to Montana residents.
- Compare kits
- See the Montana directoryNo professionals are listed in Montana yet. The state program can point you to registered testers and mitigators.
What Montana's program says
- Phone
- 1-800-546-0483
- Licensing of radon professionals
Montana DEQ does not certify or require proof of certification for the contractors listed.
What it means
Wheatland County, Questions
Questions about radon in Wheatland County
Are radon levels high in Wheatland County?
Over the 2008 to 2017 laboratory totals, 100.0% of the radon tests reported to CDC for Wheatland County, Montana were at or above 4 pCi/L, and the median reported pre-mitigation result was 12.8 pCi/L. Of the counties bordering it, 2 have a figure over the 2006 to 2015 laboratory totals: Fergus County reported the largest share at or above 4 pCi/L, 72.2%, and Judith Basin County the smallest, 64.3%.
Which counties border Wheatland County?
Wheatland County borders 5 counties: Golden Valley County, Sweet Grass County, Judith Basin County, Meagher County and Fergus County.
Products
Wheatland County, Products
Testing a home in Wheatland County
No CDC figure names Wheatland County; the nearest county with one, Judith Basin County (45 miles away), reported 64.3% of its tests at or above 4 pCi/L over the 2006 to 2015 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Wheatland County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Monitor
View Plus radon and air quality monitor
- C-NRPP 2024/25: Approved
- Battery
- Wi-Fi, Bluetooth
- Screen, app
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Wheatland County, Bordering counties
Counties bordering Wheatland County
Calculated by Radon411- Radon levels in Golden Valley CountyEPA zone 2
100.0%at or above 4 pCi/L
Median 5.0 pCi/L · 1 test
- Radon levels in Sweet Grass CountyEPA zone 2
80.0%at or above 4 pCi/L
Median 9.7 pCi/L · 10 tests
- Radon levels in Fergus CountyEPA zone 1
72.2%at or above 4 pCi/L
Median 7.0 pCi/L · 72 tests
- Radon levels in Judith Basin CountyEPA zone 1
64.3%at or above 4 pCi/L
Median 5.9 pCi/L · 42 tests
- Radon levels in Meagher CountyEPA zone 1
0.0%at or above 4 pCi/L
Median 3.6 pCi/L · 1 test
Wheatland County, Cities and towns
Cities and towns in Wheatland County
The Census Bureau estimates 2,100 residents in Wheatland County for July 1, 2025, 25 more than in 2020 (+1.2%). Spread over its land, that is 1.5 people to the square mile. Its largest town, Harlowton, has 976 residents, 46.5% of the total. Together its 2 incorporated places hold 51.8% of those residents; the other 48.2% live outside any of them. Reported testing is thin here: 3 tests over 2007 to 2016, or 1.4 for every 1,000 residents (2025 estimate), where Montana as a whole comes to 8.1.
From Harlowton to Judith Gap, CDC publishes no figure by town: each reads Wheatland County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Harlowton | 976 | +1.5% | 46.5% |
| Judith Gap | 111 | +1.8% | 5.3% |
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).
Wheatland County, Homes
Homes in Wheatland County
Wheatland County is a place of houses on their own lots: 83% of its 1,159 homes are detached single-family houses, against 69% across Montana. The homes are older than Montana's as a whole: half were built before 1960 (1980 for Montana), and 50% date from before 1960. Owners live in 76% of the occupied homes (Montana: 69%), so for most households a test and a fix are their own to order.
| Homes | Wheatland County | Montana |
|---|---|---|
| Housing units | 1,159 | 522,939 |
| Detached houses | 83% | 69% |
| In buildings of 5 or more | 0% | 9% |
| Mobile homes | 11% | 10% |
| Built before 1960 | 50% | 26% |
| Built since 2000 | 17% | 27% |
| Middle year built | 1960 | 1980 |
| Owner-occupied | 76% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.