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 Meagher County, Montana
EPA puts Meagher County in Zone 1, its highest 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
64.3%
Judith Basin County
- Judith Basin
- 64.3%
- Cascade
- 35.9%
5 of 8 neighbours have 30+ tests, 2006 to 2015
Nearest county
64.3%
Judith Basin County, 43 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
- Meagher
- 100.0%
- Montana
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
1
Too few for a share
- Meagher
- 1
- 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 Meagher 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
Meagher County, At a glance
Meagher County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Meagher County in
USGS geologic potential: High across 78% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Meagher County, 2008 to 2017, laboratory
CDC holds 1 reported test for Meagher County over the 2008 to 2017 laboratory totals, a result of 3.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Meagher County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Meagher 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).
Meagher County, Compared
Meagher County radon figures, compared
Calculated by Radon411CDC's largest figure for Meagher County rests on 1 test over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 3.6 pCi/L, with a middle value of 3.6 pCi/L.
Of the counties bordering it, 5 have a figure over the 2006 to 2015 laboratory totals: Judith Basin County reported the largest share at or above 4 pCi/L, 64.3%, and Cascade County the smallest, 35.9%, with Lewis and Clark County at 63.5%, Park County at 57.9% and Gallatin County at 48.8% between. Farther out, Jefferson County (66 miles away) at 66.1%, Fergus County (91 miles away) at 72.2% and Stillwater County (96 miles away) at 61.8% 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 Meagher County in Zone 1, the map's highest label: a predicted county average above 4 pCi/L. USGS geology rates 78% of the county's land high radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Meagher County, Geology
The ground under Meagher County
PredictedMost of the ground under Meagher County is one class on USGS's geologic map: 78.3% of its land is high radon potential, with 21.7% moderate. The map puts 78.3% of Meagher County in the area it calls Northern Rocky Mountains and 21.7% in Plains and Mountains. USGS gives the first a radon index of 13, in the high band (12 to 17), and the second 10, in the moderate band (9 to 11).
| 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 | 78.3% |
| Plains and Mountains | Marine and continental shale, siltstone, and sandstone of Cretaceous and Tertiary ages, and volcanic rocks. | Moderate | 10 | 21.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Meagher County beside the ground around it
On high-potential ground Meagher County is close to Montana as a whole: 78.3% of its land against 78.5%. Of the 8 counties that border it, 4 have more high-potential ground, Broadwater County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Meagher County, Local resources
Radon testing and mitigation in Meagher 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
Meagher County, Questions
Questions about radon in Meagher County
Are radon levels high in Meagher County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Meagher County, Montana were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.6 pCi/L. Of the counties bordering it, 5 have a figure over the 2006 to 2015 laboratory totals: Judith Basin County reported the largest share at or above 4 pCi/L, 64.3%, and Cascade County the smallest, 35.9%, with Lewis and Clark County at 63.5%, Park County at 57.9% and Gallatin County at 48.8% between.
Which counties border Meagher County?
Meagher County borders 8 counties: Broadwater County, Judith Basin County, Wheatland County, Cascade County, Park County, Sweet Grass County, Lewis and Clark County and Gallatin County.
Products
Meagher County, Products
Testing a home in Meagher County
No CDC figure names Meagher County; the nearest county with one, Judith Basin County (43 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 1 the year-round level in Meagher 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
EcoBlu plug-in digital radon monitor with a display
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
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
Meagher County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Meagher County
Explore
Meagher County, Bordering counties
Counties bordering Meagher County
Calculated by Radon411- 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 Judith Basin CountyEPA zone 1
64.3%at or above 4 pCi/L
Median 5.9 pCi/L · 42 tests
- Radon levels in Lewis and Clark CountyEPA zone 1
63.5%at or above 4 pCi/L
Median 5.1 pCi/L · 395 tests
- Radon levels in Broadwater CountyEPA zone 1
61.1%at or above 4 pCi/L
Median 6.5 pCi/L · 18 tests
- Radon levels in Park CountyEPA zone 1
57.9%at or above 4 pCi/L
Median 5.1 pCi/L · 140 tests
- Radon levels in Wheatland CountyEPA zone 2
50.0%at or above 4 pCi/L
Median 5.5 pCi/L · 2 tests
- Radon levels in Gallatin CountyEPA zone 1
48.8%at or above 4 pCi/L
Median 3.8 pCi/L · 914 tests
- Radon levels in Cascade CountyEPA zone 1
35.9%at or above 4 pCi/L
Median 2.6 pCi/L · 284 tests
Meagher County, Cities and towns
Cities and towns in Meagher County
Meagher County is growing: the Census Bureau puts it at 2,137 residents on July 1, 2025, up 11.2% from 1,922 in 2020. Spread over its land, that is 0.9 people to the square mile. White Sulphur Springs, its one incorporated place, has 1,056 residents, 49.4% of the total. Reported testing is thin here: 1 test over 2008 to 2017, or 0.5 for every 1,000 residents (2025 estimate), where Montana as a whole comes to 8.6.
White Sulphur Springs is the one incorporated place here; CDC publishes no figure by town, so it reads Meagher County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| White Sulphur Springs | 1,056 | +11.2% | 49.4% |
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).
Meagher County, Homes
Homes in Meagher County
Meagher County is a place of houses on their own lots: 80% of its 1,460 homes are detached single-family houses, against 69% across Montana. Half of its homes were built before 1973, close to Montana's 1980: 39% date from before 1960 and 23% from 2000 or later. Owners live in 82% of the occupied homes (Montana: 69%), so for most households a test and a fix are their own to order.
| Homes | Meagher County | Montana |
|---|---|---|
| Housing units | 1,460 | 522,939 |
| Detached houses | 80% | 69% |
| In buildings of 5 or more | under 1% | 9% |
| Mobile homes | 19% | 10% |
| Built before 1960 | 39% | 26% |
| Built since 2000 | 23% | 27% |
| Middle year built | 1973 | 1980 |
| Owner-occupied | 82% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.