Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Osage County, Missouri
EPA puts Osage County in Zone 2, its middle radon zone, and only 9 radon tests from it are on file with CDC (2022). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
13.6%
18.8 pts below MO
- Osage
- 13.6%
- Missouri
- 32.4%
59 tests, 2005 to 2014
Median result
1.6pCi/L
Below action level
- Osage
- 1.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2005 to 2014
Tests reported
59
48th of 66 by tests
- Osage
- 59
- St. Louis
- 12,434
Reported to CDC before any fix, 2005 to 2014
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Missouri
63 of 66
Lowest quarter
- Osage
- 13.6%
- Atchison
- 70.5%
By share, of 66 with 30+ tests
Read a result for Osage County
Starts at Osage County's median, 1.6 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.6 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Osage County's median reported result, 2005 to 2014.
The data
Osage County, At a glance
Osage County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Osage County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Osage County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2015 | 0.0% |
| 2020 | 50.0% |
| 2021 | 44.4% |
| 2022 | 0.0% |
2022: 0.0%. Across these years the share ran from 0.0% to 50.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 9 tests were reported to CDC for Osage County over 2022, 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: 2022. Measured data period: 2005 to 2022 (every CDC figure on file).
Osage County, Compared
Osage County radon figures, compared
Calculated by Radon411Osage County reports fewer high tests than Missouri overall. 13.6% of its 59 tests over the 2005 to 2014 laboratory totals were at or above 4 pCi/L. That is 18.8 points below the 32.4% pooled from 115 Missouri counties.
The newest figure, in 2022, counts only 9 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 59-test figure.
Ordered from highest share down, it comes 63rd of 66 Missouri counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 36.0%; Osage County sits 22.4 points below it.
Next door, the shares run from 15.0% in Miller County to 32.4% in Callaway County. Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 13.6% share point the same way here.
Half the tests came in under 1.6 pCi/L and half over it; the single highest reached 23.2 pCi/L. The rest split 55.9% under 2 pCi/L and 30.5% from 2 to 4 (Missouri: 40.0% and 27.6%).
The busiest year on file was 2021, with 9 tests reported; the quietest, 2015, had 1.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Osage County, Geology
The ground under Osage County
PredictedUSGS's geologic map puts all of Osage County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Salem Plateau, to which USGS gives a radon index of 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Salem Plateau | Ordovician dolomite, sandstone, limestone, and shale. | Moderate | 11 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Osage County beside the ground around it
Across Missouri 8.2% of the land is rated high; none of Osage County's is. Of the 6 counties that border it, none has as large a share of moderate-potential ground; Callaway County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Osage County, Local resources
Radon testing and mitigation in Osage County
- Missouri Radon ProgramMissouri Radon Program, run by Missouri Department of Health and Senior Services, offers free or discounted test kits, and answers questions about testing and mitigation in Missouri.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Free radon test kits are available for Missouri residents (limit one per household).
- Compare kits
- Professionals in Missouri27 professionals are listed in Missouri.
What Missouri's program says
- Phone
- 573-751-6102
- radon@health.mo.gov
What it means
Osage County, Questions
Questions about radon in Osage County
Are radon levels high in Osage County?
In 2022, 0.0% of the radon tests reported to CDC for Osage County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.2 pCi/L. Of 66 Missouri counties with 30 or more tests for the same period, 62 reported a higher share; pooled, the state comes to 32.4%.
Which counties border Osage County?
Osage County borders 6 counties: Gasconade County, Callaway County, Cole County, Maries County, Montgomery County and Miller County.
Products
Osage County, Products
Testing a home in Osage County
In Osage County, 13.6% of 59 tests reported to CDC over the 2005 to 2014 laboratory totals reached 4 pCi/L, against 32.4% pooled across Missouri. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Osage County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Monitor
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Osage County, Bordering counties
Counties bordering Osage County
Calculated by Radon411- Radon levels in Callaway CountyEPA zone 2
32.4%at or above 4 pCi/L
Median 1.9 pCi/L · 179 tests · 18.8 points above Osage County
- Radon levels in Cole CountyEPA zone 2
25.9%at or above 4 pCi/L
Median 2.1 pCi/L · 742 tests · 12.3 points above Osage County
- Radon levels in Gasconade CountyEPA zone 2
18.5%at or above 4 pCi/L
Median 1.7 pCi/L · 27 tests · 4.9 points above Osage County
- Radon levels in Montgomery CountyEPA zone 2
18.4%at or above 4 pCi/L
Median 1.6 pCi/L · 38 tests · 4.8 points above Osage County
- Radon levels in Miller CountyEPA zone 2
15.0%at or above 4 pCi/L
Median 1.8 pCi/L · 113 tests · 1.4 points above Osage County
- Radon levels in Maries CountyEPA zone 2
14.3%at or above 4 pCi/L
Median 1.5 pCi/L · 21 tests · 0.7 points above Osage County
Osage County, Cities and towns
Cities and towns in Osage County
The Census Bureau estimates 13,611 residents in Osage County for July 1, 2025, 361 more than in 2020 (+2.7%). That works out to 22 people per square mile of land. No town dominates: Linn, the largest, has 1,453 residents, 10.7% of the total. Reported testing is thin here: 59 tests over 2005 to 2014, or 4.3 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 6.8.
From Linn to Argyle, CDC publishes no figure by town: each reads Osage County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Linn | 1,453 | +4.9% | 10.7% |
| Belleextends beyond Osage County | 1,379 | −0.3% | Counted whole |
| Blandextends beyond Osage County | 505 | −0.8% | Counted whole |
| Freeburg | 407 | +2.3% | 3.0% |
| Westphalia | 404 | +1.8% | 3.0% |
| Chamois | 387 | +2.4% | 2.8% |
| Meta | 182 | +1.7% | 1.3% |
| Argyleextends beyond Osage County | 145 | +1.4% | Counted whole |
8 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). A place that extends beyond Osage County is counted whole, so it has no share.
Osage County, Homes
Homes in Osage County
Osage County is a place of houses on their own lots: 80% of its 6,490 homes are detached single-family houses, against 70% across Missouri. Half of its homes were built before 1979, close to Missouri's 1978: 26% date from before 1960 and 26% from 2000 or later. Owners live in 81% of the occupied homes (Missouri: 68%), so for most households a test and a fix are their own to order.
| Homes | Osage County | Missouri |
|---|---|---|
| Housing units | 6,490 | 2,809,501 |
| Detached houses | 80% | 70% |
| In buildings of 5 or more | 6% | 13% |
| Mobile homes | 8% | 5% |
| Built before 1960 | 26% | 28% |
| Built since 2000 | 26% | 21% |
| Middle year built | 1979 | 1978 |
| Owner-occupied | 81% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.