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 Wibaux County, Montana
EPA puts Wibaux County in Zone 1, its highest radon zone, and only 4 radon tests from it are 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
75.0%
Richland County
- Richland
- 75.0%
- Dawson
- 47.3%
3 of 6 neighbours have 30+ tests, 2006 to 2015
Nearest county
47.3%
Dawson County, 37 miles
- Dawson
- 47.3%
- Montana
- 47.4%
Share at 4+ pCi/L, 55 tests, 2006 to 2015
Ground above low
100.0%
Level with Montana
- Wibaux
- 100.0%
- Montana
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
4
Too few for a share
- Wibaux
- 4
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Read a result for Wibaux 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
Wibaux County, At a glance
Wibaux County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Wibaux County in
USGS geologic potential: High across 81% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Wibaux County, 2008 to 2017, laboratory
CDC holds 4 reported tests for Wibaux County over the 2008 to 2017 laboratory totals, with a median of 3.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Wibaux County beside the counties around it is how this page reads it.
What these figures count
Only 4 tests were reported to CDC for Wibaux 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).
Wibaux County, Compared
Wibaux County radon figures, compared
Calculated by Radon411CDC's largest figure for Wibaux County rests on 4 tests over the 2008 to 2017 laboratory totals, 2 of them at or above 4 pCi/L, so each test moves its share by 25.0 points and no rank or comparison is drawn from it. Results reached as high as 18.3 pCi/L, with a middle value of 3.0 pCi/L.
Of the counties bordering it, 3 have a figure over the 2006 to 2015 laboratory totals: Richland County reported the largest share at or above 4 pCi/L, 75.0%, and Dawson County the smallest, 47.3%, with McKenzie County, ND at 65.2% between. Farther out, Sheridan County (122 miles away) at 75.7%, Valley County (149 miles away) at 50.0% and Yellowstone County (205 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 Wibaux County in Zone 1, the map's highest label: a predicted county average above 4 pCi/L. USGS geology rates 81% of the county's land high radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Wibaux County, Geology
The ground under Wibaux County
PredictedMost of the ground under Wibaux County is one class on USGS's geologic map: 81.3% of its land is high radon potential, with 18.7% moderate. The map puts 77.2% of Wibaux County in the area it calls Great Plains and 18.7% in Eastern Great Plains, with one smaller area beside them. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Great Plains | Tertiary sandstone, siltstone, shale, coal. | High | 12 | 77.2% |
| Eastern Great Plains | Cretaceous marine shale and marine and nearshore sandstone, siltstone. | Moderate | 11 | 18.7% |
| Great Plains (Glaciated) | Glacial deposits derived from Cretaceous shales containing higher than average amounts of uranium. | High | 13 | 4.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Wibaux County beside the ground around it
On high-potential ground Wibaux County is close to Montana as a whole: 81.3% of its land against 78.5%. Of the 6 counties that border it, 5 have more high-potential ground, Golden Valley County, ND the most at 100%.
The map rates the ground, not the air in any home.
Local help
Wibaux County, Local resources
Radon testing and mitigation in Wibaux 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
Wibaux County, Questions
Questions about radon in Wibaux County
Are radon levels high in Wibaux County?
Over the 2008 to 2017 laboratory totals, 50.0% of the radon tests reported to CDC for Wibaux County, Montana were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.0 pCi/L. Of the counties bordering it, 3 have a figure over the 2006 to 2015 laboratory totals: Richland County reported the largest share at or above 4 pCi/L, 75.0%, and Dawson County the smallest, 47.3%, with McKenzie County, ND at 65.2% between.
Which counties border Wibaux County?
Wibaux County borders 6 counties: Golden Valley County, ND, Dawson County, MT, Fallon County, MT, Richland County, MT, Prairie County, MT and McKenzie County, ND.
Products
Wibaux County, Products
Testing a home in Wibaux County
No CDC figure names Wibaux County; the nearest county with one, Dawson County (37 miles away), reported 47.3% 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 1 the year-round level in Wibaux 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
MonitorAranet
Radon Plus battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Approved
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Wibaux County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Wibaux County
Explore
Wibaux County, Bordering counties
Counties bordering Wibaux County
Calculated by Radon411- Radon levels in Richland County, MTEPA zone 1
75.0%at or above 4 pCi/L
Median 5.6 pCi/L · 40 tests
- Radon levels in Fallon County, MTEPA zone 1
71.4%at or above 4 pCi/L
Median 5.2 pCi/L · 7 tests
- Radon levels in McKenzie County, NDEPA zone 1
65.2%at or above 4 pCi/L
Median 5.1 pCi/L · 46 tests
- Radon levels in Dawson County, MTEPA zone 1
47.3%at or above 4 pCi/L
Median 3.5 pCi/L · 55 tests
- Radon levels in Golden Valley County, NDEPA zone 1
29.4%at or above 4 pCi/L
Median 2.7 pCi/L · 17 tests
- Radon levels in Prairie County, MTEPA zone 1
28.6%at or above 4 pCi/L
Median 3.3 pCi/L · 7 tests
Wibaux County, Cities and towns
Cities and towns in Wibaux County
Wibaux County has been losing residents: from 936 in 2020 to 885 on July 1, 2025, a fall of 5.4% by the Census Bureau's estimates. Spread over its land, that is 1.0 people to the square mile. Wibaux, its one incorporated place, has 441 residents, 49.8% of the total. Reported testing is thin here: 4 tests over 2008 to 2017, or 4.5 for every 1,000 residents (2025 estimate), where Montana as a whole comes to 8.6.
Wibaux is the one incorporated place here; CDC publishes no figure by town, so it reads Wibaux County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Wibaux | 441 | −4.3% | 49.8% |
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).
Wibaux County, Homes
Homes in Wibaux County
Of Wibaux County's 596 homes, 74% are detached houses, against 69% across Montana; 17% are mobile homes. The homes are older than Montana's as a whole: half were built before 1967 (1980 for Montana), and 45% date from before 1960. Owners live in 75% of the occupied homes (Montana: 69%), so for most households a test and a fix are their own to order.
| Homes | Wibaux County | Montana |
|---|---|---|
| Housing units | 596 | 522,939 |
| Detached houses | 74% | 69% |
| In buildings of 5 or more | 0% | 9% |
| Mobile homes | 17% | 10% |
| Built before 1960 | 45% | 26% |
| Built since 2000 | 18% | 27% |
| Middle year built | 1967 | 1980 |
| Owner-occupied | 75% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.