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 Mineral County, Montana
EPA puts Mineral County in Zone 1, its highest radon zone, and high results are common there: 56.7% of the 30 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
56.7%
11.2 pts above MT
- Mineral
- 56.7%
- Montana
- 45.5%
30 tests, 2008 to 2017
Median result
5.1pCi/L
Action level reached
- Mineral
- 5.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
30
23rd of 23 by tests
- Mineral
- 30
- Missoula
- 2,613
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 Montana
10 of 23
Middle half
- Mineral
- 56.7%
- Richland
- 78.6%
By share, of 23 with 30+ tests
Read a result for Mineral County
Starts at Mineral County's median, 5.1 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 5.1 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. Mineral County's median reported result, 2008 to 2017.
The data
Mineral County, At a glance
Mineral County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Mineral 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 Mineral County, 2008 to 2017, laboratory
Under 2 pCi/L: 20%2 to 4 pCi/L: 23%4 pCi/L and above: 57%
Of 30 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 6 | 20.0% |
| 2 to 4 pCi/L | 7 | 23.3% |
| 4 pCi/L and above | 17 | 56.7% |
What these figures count
These are the 30 tests reported to CDC for Mineral 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).
Mineral County, Compared
Mineral County radon figures, compared
Calculated by Radon411More than half: 56.7% of the 30 radon tests reported to CDC for Mineral County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 10th of 23 Montana counties with 30 or more tests for the same period. That is 11.2 points above the 45.5% pooled from 51 Montana counties.
The median result, 5.1 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 49.9 pCi/L. The rest split 20.0% under 2 pCi/L and 23.3% from 2 to 4 (Montana: 29.2% and 25.2%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 56.7% share point the same way here.
1 of its 4 bordering counties with figures ran higher, led by Shoshone County, ID at 63.0%; Clearwater County, ID reported 30.3%. Statewide for the same period, Richland County reported the highest share (78.6%) and Cascade County the lowest (29.4%).
CDC's ten-year totals for Mineral County went from 21 tests (2005 to 2014) to 30 (2008 to 2017), the share going from 38.1% to 56.7%.
Nationally, every county with a figure for the same period pools to 35.7%; Mineral County sits 21.0 points above it.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Mineral County, Geology
The ground under Mineral County
PredictedUSGS's geologic map puts all of Mineral County's mapped land in one class: high radon potential. All of it lies in the area the map calls Northern Rocky Mountains, to which USGS gives a radon index of 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Northern Rocky Mountains | Granitic, metaigneous, metasedimentary rocks, valley fill colluvium and alluvium. | High | 13 | 99.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Mineral County beside the ground around it
Mineral County has more high-potential ground than Montana as a whole: 100% of its land against 78.5%. Of the 4 counties that border it, none has as large a share of high-potential ground; Missoula County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Mineral County, Local resources
Radon testing and mitigation in Mineral 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
Mineral County, Questions
Questions about radon in Mineral County
Are radon levels high in Mineral County?
Over the 2008 to 2017 laboratory totals, 56.7% of the radon tests reported to CDC for Mineral County, Montana were at or above 4 pCi/L, and the median reported pre-mitigation result was 5.1 pCi/L. Of 23 Montana counties with 30 or more tests for the same period, 9 reported a higher share; pooled, the state comes to 45.5%.
Which counties border Mineral County?
Mineral County borders 4 counties: Sanders County, MT, Missoula County, MT, Clearwater County, ID and Shoshone County, ID.
Products
Mineral County, Products
Testing a home in Mineral County
In Mineral County, 56.7% of 30 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 45.5% pooled across Montana. In Zone 1 the year-round level in Mineral 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
MonitorX-Sense
XR0A-SR battery digital radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
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
Mineral County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Mineral County
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Mineral County, Bordering counties
Counties bordering Mineral County
Calculated by Radon411- Radon levels in Shoshone County, IDEPA zone 1
63.0%at or above 4 pCi/L
Median 5.7 pCi/L · 81 tests · 6.3 points above Mineral County
- Radon levels in Sanders County, MTEPA zone 1
50.0%at or above 4 pCi/L
Median 4.0 pCi/L · 38 tests · 6.7 points below Mineral County
- Radon levels in Missoula County, MTEPA zone 1
44.6%at or above 4 pCi/L
Median 3.4 pCi/L · 2,613 tests · 12.1 points below Mineral County
- Radon levels in Clearwater County, IDEPA zone 1
30.3%at or above 4 pCi/L
Median 1.8 pCi/L · 33 tests · 26.4 points below Mineral County
Mineral County, Cities and towns
Cities and towns in Mineral County
Mineral County is growing: the Census Bureau puts it at 5,185 residents on July 1, 2025, up 13.5% from 4,567 in 2020. Spread over its land, that is 4.3 people to the square mile. No town dominates: Superior, the largest, has 935 residents, 18.0% of the total. Together its 2 incorporated places hold 28.7% of those residents; the other 71.3% live outside any of them. CDC's 30 reported tests for 2008 to 2017 work out to 5.8 per 1,000 residents (2025 estimate), close to Montana's 8.6.
From Superior to Alberton, CDC publishes no figure by town: each reads Mineral County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Superior | 935 | +12.4% | 18.0% |
| Alberton | 551 | +22.7% | 10.6% |
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).
Mineral County, Homes
Homes in Mineral County
Mineral County is a place of houses on their own lots: 76% of its 2,569 homes are detached single-family houses, against 69% across Montana. Half of its homes were built before 1982, close to Montana's 1980: 18% date from before 1960 and 31% from 2000 or later. Owners live in 80% of the occupied homes (Montana: 69%), so for most households a test and a fix are their own to order.
| Homes | Mineral County | Montana |
|---|---|---|
| Housing units | 2,569 | 522,939 |
| Detached houses | 76% | 69% |
| In buildings of 5 or more | 3% | 9% |
| Mobile homes | 17% | 10% |
| Built before 1960 | 18% | 26% |
| Built since 2000 | 31% | 27% |
| Middle year built | 1982 | 1980 |
| Owner-occupied | 80% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.