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 Glacier County, Montana
EPA puts Glacier County in Zone 1, its highest radon zone, and only 7 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
38.0%
Flathead County
- Flathead
- 38.0%
1 of 3 neighbours have 30+ tests, 2006 to 2015
Nearest county
38.0%
Flathead County, 56 miles
- Flathead
- 38.0%
- Montana
- 47.4%
Share at 4+ pCi/L, 924 tests, 2006 to 2015
Ground above low
100.0%
Level with Montana
- Glacier
- 100.0%
- Montana
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
7
Too few for a share
- Glacier
- 7
- 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 Glacier 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
Glacier County, At a glance
Glacier County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Glacier 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 Glacier County, 2008 to 2017, laboratory
CDC holds 7 reported tests for Glacier County over the 2008 to 2017 laboratory totals, with a median of 2.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Glacier County beside the counties around it is how this page reads it.
What these figures count
Only 7 tests were reported to CDC for Glacier 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).
Glacier County, Compared
Glacier County radon figures, compared
Calculated by Radon411CDC's largest figure for Glacier County rests on 7 tests over the 2008 to 2017 laboratory totals, 1 of them at or above 4 pCi/L, so each test moves its share by 14.3 points and no rank or comparison is drawn from it. Results reached as high as 6.1 pCi/L, with a middle value of 2.6 pCi/L.
Flathead County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 38.0% of its tests at or above 4 pCi/L. Farther out, Lake County (89 miles away) at 38.0%, Lincoln County (111 miles away) at 56.3% and Lewis and Clark County (113 miles away) at 63.5% 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 Glacier County in Zone 1, the map's highest label: a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Glacier County, Geology
The ground under Glacier County
PredictedUSGS's geologic map puts all of Glacier County's mapped land in one class: high radon potential. The map puts 94.5% of Glacier County in the area it calls Northern Rocky Mountains and 5.5% in Great Plains (Glaciated). USGS gives both 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 | 94.5% |
| Great Plains (Glaciated) | Glacial deposits derived from Cretaceous shales containing higher than average amounts of uranium. | High | 13 | 5.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Glacier County beside the ground around it
Glacier County has more high-potential ground than Montana as a whole: 100% of its land against 78.5%. Of the 3 counties that border it, none has as large a share of high-potential ground; Flathead County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Glacier County, Local resources
Radon testing and mitigation in Glacier 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
Glacier County, Questions
Questions about radon in Glacier County
Are radon levels high in Glacier County?
Over the 2008 to 2017 laboratory totals, 14.3% of the radon tests reported to CDC for Glacier County, Montana were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.6 pCi/L. Flathead County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 38.0% of its tests at or above 4 pCi/L.
Which counties border Glacier County?
Glacier County borders 3 counties: Pondera County, Toole County and Flathead County.
Products
Glacier County, Products
Testing a home in Glacier County
No CDC figure names Glacier County; the nearest county with one, Flathead County (56 miles away), reported 38.0% 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 Glacier 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
lüft plug-in radon and indoor air quality monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi, Bluetooth
- App only
First reading: Within 90 minutes
Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Glacier County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Glacier County
Explore
Glacier County, Bordering counties
Counties bordering Glacier County
Calculated by Radon411- Radon levels in Flathead CountyEPA zone 1
38.0%at or above 4 pCi/L
Median 2.8 pCi/L · 924 tests
- Radon levels in Toole CountyEPA zone 1
33.3%at or above 4 pCi/L
Median 3.4 pCi/L · 6 tests
- Radon levels in Pondera CountyEPA zone 1
0.0%at or above 4 pCi/L
Median 1.1 pCi/L · 5 tests
Glacier County, Cities and towns
Cities and towns in Glacier County
About 13,463 people live in Glacier County by the Census Bureau's estimate for July 1, 2025, 273 fewer than in 2020 (−2.0%). Spread over its land, that is 4.5 people to the square mile. Its largest town, Cut Bank, has 2,976 residents, 22.1% of the total. Reported testing is thin here: 7 tests over 2008 to 2017, or 0.5 for every 1,000 residents (2025 estimate), where Montana as a whole comes to 8.6.
From Cut Bank to Browning, CDC publishes no figure by town: each reads Glacier County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Cut Bank | 2,976 | −2.4% | 22.1% |
- Browning
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).
Glacier County, Homes
Homes in Glacier County
Of Glacier County's 5,346 homes, 68% are detached houses, against 69% across Montana; 16% are mobile homes. Half of its homes were built before 1975, close to Montana's 1980: 30% date from before 1960 and 11% from 2000 or later. 65% of occupied homes are lived in by their owner (Montana: 69%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Glacier County | Montana |
|---|---|---|
| Housing units | 5,346 | 522,939 |
| Detached houses | 68% | 69% |
| In buildings of 5 or more | 3% | 9% |
| Mobile homes | 16% | 10% |
| Built before 1960 | 30% | 26% |
| Built since 2000 | 11% | 27% |
| Middle year built | 1975 | 1980 |
| Owner-occupied | 65% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.