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 Liberty County, Montana
EPA puts Liberty County in Zone 1, its highest radon zone, and only 3 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
35.0%
Hill County
- Hill
- 35.0%
1 of 4 neighbours have 30+ tests, 2006 to 2015
Nearest county
35.0%
Hill County, 42 miles
- Hill
- 35.0%
- Montana
- 47.4%
Share at 4+ pCi/L, 120 tests, 2006 to 2015
Ground above low
100.0%
Level with Montana
- Liberty
- 100.0%
- Montana
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
3
Too few for a share
- Liberty
- 3
- 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 Liberty 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
Liberty County, At a glance
Liberty County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Liberty 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 Liberty County, 2008 to 2017, laboratory
CDC holds 3 reported tests for Liberty County over the 2008 to 2017 laboratory totals, with a median of 3.8 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Liberty County beside the counties around it is how this page reads it.
What these figures count
Only 3 tests were reported to CDC for Liberty 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).
Liberty County, Compared
Liberty County radon figures, compared
Calculated by Radon411CDC's largest figure for Liberty County rests on 3 tests over the 2008 to 2017 laboratory totals, 1 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 4.2 pCi/L, with a middle value of 3.8 pCi/L.
Hill County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 35.0% of its tests at or above 4 pCi/L. Farther out, Cascade County (88 miles away) at 35.9%, Judith Basin County (111 miles away) at 64.3% and Lewis and Clark County (118 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 Liberty 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.
Liberty County, Geology
The ground under Liberty County
PredictedUSGS's geologic map puts all of Liberty County's mapped land in one class: high radon potential. The map puts 95.0% of Liberty County in the area it calls Great Plains (Glaciated) and 5.0% in Northern Rocky Mountains. 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 |
|---|---|---|---|---|
| Great Plains (Glaciated) | Glacial deposits derived from Cretaceous shales containing higher than average amounts of uranium. | High | 13 | 95.0% |
| Northern Rocky Mountains | Granitic, metaigneous, metasedimentary rocks, valley fill colluvium and alluvium. | High | 13 | 5.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Liberty County beside the ground around it
Liberty 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; Hill County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Liberty County, Local resources
Radon testing and mitigation in Liberty 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
Liberty County, Questions
Questions about radon in Liberty County
Are radon levels high in Liberty County?
Over the 2008 to 2017 laboratory totals, 33.3% of the radon tests reported to CDC for Liberty County, Montana were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.8 pCi/L. Hill County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 35.0% of its tests at or above 4 pCi/L.
Which counties border Liberty County?
Liberty County borders 4 counties: Toole County, Hill County, Chouteau County and Pondera County.
Products
Liberty County, Products
Testing a home in Liberty County
No CDC figure names Liberty County; the nearest county with one, Hill County (42 miles away), reported 35.0% 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 Liberty 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
RM-63Pro rechargeable radon monitor with a touchscreen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Liberty County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Liberty County
Explore
Liberty County, Bordering counties
Counties bordering Liberty County
Calculated by Radon411- Radon levels in Chouteau CountyEPA zone 1
58.3%at or above 4 pCi/L
Median 5.1 pCi/L · 12 tests
- Radon levels in Hill CountyEPA zone 1
35.0%at or above 4 pCi/L
Median 3.2 pCi/L · 120 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
Liberty County, Cities and towns
Cities and towns in Liberty County
Liberty County's population has barely moved since 2020: 1,957 residents on July 1, 2025 against 1,956 then, by the Census Bureau's estimates. Spread over its land, that is 1.4 people to the square mile. Chester, its one incorporated place, has 844 residents, 43.1% of the total. Reported testing is thin here: 3 tests over 2008 to 2017, or 1.5 for every 1,000 residents (2025 estimate), where Montana as a whole comes to 8.6.
Chester is the one incorporated place here; CDC publishes no figure by town, so it reads Liberty County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Chester | 844 | −0.1% | 43.1% |
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).
Liberty County, Homes
Homes in Liberty County
Of Liberty County's 832 homes, 72% are detached houses, against 69% across Montana; 13% are in buildings of five or more homes. The homes are older than Montana's as a whole: half were built before 1964 (1980 for Montana), and 45% date from before 1960. 64% 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 | Liberty County | Montana |
|---|---|---|
| Housing units | 832 | 522,939 |
| Detached houses | 72% | 69% |
| In buildings of 5 or more | 13% | 9% |
| Mobile homes | 11% | 10% |
| Built before 1960 | 45% | 26% |
| Built since 2000 | 9% | 27% |
| Middle year built | 1964 | 1980 |
| Owner-occupied | 64% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.