Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Osage County, Kansas
EPA puts Osage County in Zone 2, its middle radon zone, and only 26 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
34.4%
2.6 pts above KS
- Osage
- 34.4%
- Kansas
- 31.8%
96 tests, 2021
Median result
2.7pCi/L
Below action level
- Osage
- 2.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2021
Tests reported
96
40th of 62 by tests
- Osage
- 96
- Johnson
- 25,860
Reported to CDC before any fix, 2021
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 Kansas
34 of 62
Middle half
- Osage
- 34.4%
- Norton
- 93.8%
By share, of 62 with 30+ tests
Read a result for Osage County
Starts at Osage County's median, 2.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.7 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Osage County's median reported result, 2021.
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 |
|---|---|
| 2016 | 30.8% |
| 2017 | 42.9% |
| 2018 | 54.2% |
| 2019 | 31.0% |
| 2020 | 37.1% |
| 2021 | 34.4% |
| 2022 | 42.3% |
2022: 42.3%. Across these years the share ran from 30.8% to 54.2%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 26 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: 2016 to 2022 (every CDC figure on file).
Osage County, Compared
Osage County radon figures, compared
Calculated by Radon411In Osage County, about 3 in 10 reported tests in 2021 (33 of 96) were at or above EPA's action level. Against the national pool of 24.4%, the gap is 10.0 points higher. Across 96 Kansas counties pooled together, 31.8% of tests reached that level, so Osage County runs 2.6 points above its state.
The newest figure, in 2022, counts only 26 tests (42.3% at or above 4 pCi/L), too few to compare, so this reading uses the 96-test figure.
Of 5 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 25.0% (Shawnee County) to 41.2% (Wabaunsee County). By share, Osage County is 34th of 62 Kansas counties with 30 or more tests for the same period.
Year by year, 2017 opened at 42.9% and 2021 closed at 34.4% (down 8.5 points), with 2018 the high at 54.2%. Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 6.1 pCi/L. Below the action level, 39 tests (40.6%) came in under 2 pCi/L, against 45.3% statewide, and 24 tests (25.0%) fell between 2 and 4, against 22.9% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 34.4% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential.
The busiest year on file was 2021, with 96 tests reported; the quietest, 2022, had 26.
Osage CountyKansas, pooled
| Year | Tests | Osage County, at or above 4 pCi/L | Kansas, pooled |
|---|---|---|---|
| 2017 | 42 | 42.9% | 37.3% |
| 2018 | 48 | 54.2% | 37.3% |
| 2019 | 42 | 31.0% | 33.7% |
| 2020 | 35 | 37.1% | 31.3% |
| 2021 | 96 | 34.4% | 31.8% |
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 Glaciated Area, to which USGS gives a radon index of 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Glaciated Area | Glacial till underlain by Pennsylvanian and Permian marine and nonmarine sedimentary shale, sandstone, limestone, coal. | Moderate | 9 | 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 Kansas 59.9% of the land is rated high; none of Osage County's is. Of the 6 counties that border it, 2 have more high-potential ground, Wabaunsee County the most at 37.6%.
The map rates the ground, not the air in any home.
Local help
Osage County, Local resources
Radon testing and mitigation in Osage County
- Kansas Radon ProgramKansas Radon Program answers questions about testing, mitigation and the rules in Kansas.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Kansas178 professionals are listed in Kansas.
What Kansas's program says
- Phone
- (800) 693-5343
What it means
Osage County, Questions
Questions about radon in Osage County
Are radon levels high in Osage County?
In 2022, 42.3% of the radon tests reported to CDC for Osage County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.5 pCi/L. Of 62 Kansas counties with 30 or more tests for the same period, 33 reported a higher share; pooled, the state comes to 31.8%.
Which counties border Osage County?
Osage County borders 6 counties: Lyon County, Franklin County, Coffey County, Shawnee County, Douglas County and Wabaunsee County.
Products
Osage County, Products
Testing a home in Osage County
In Osage County, 34.4% of 96 tests reported to CDC in 2021 reached 4 pCi/L, against 31.8% pooled across Kansas. 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
MonitorAEGTEST
HOUND-1011S rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
- 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 Wabaunsee CountyEPA zone 2
41.2%at or above 4 pCi/L
Median 3.3 pCi/L · 102 tests · 6.8 points above Osage County
- Radon levels in Lyon CountyEPA zone 2
37.8%at or above 4 pCi/L
Median 2.0 pCi/L · 111 tests · 3.4 points above Osage County
- Radon levels in Franklin CountyEPA zone 2
34.0%at or above 4 pCi/L
Median 2.3 pCi/L · 300 tests · 0.4 points below Osage County
- Radon levels in Douglas CountyEPA zone 1
30.5%at or above 4 pCi/L
Median 2.0 pCi/L · 2,901 tests · 3.9 points below Osage County
- Radon levels in Shawnee CountyEPA zone 2
25.0%at or above 4 pCi/L
Median 2.0 pCi/L · 1,392 tests · 9.4 points below Osage County
- Radon levels in Coffey CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 1.8 pCi/L · 9 tests · 34.4 points below Osage County
Osage County, Cities and towns
Cities and towns in Osage County
Osage County's population has barely moved since 2020: 15,693 residents on July 1, 2025 against 15,747 then, by the Census Bureau's estimates. That works out to 22 people per square mile of land. No town dominates: Osage City, the largest, has 2,784 residents, 17.7% of the total. Together its 9 incorporated places hold 53.3% of those residents; the other 46.7% live outside any of them. Reported testing is thin here: 96 tests over 2021, or 6.1 for every 1,000 residents (2025 estimate), where Kansas as a whole comes to 23.5.
From Osage City to Olivet, CDC publishes no figure by town: each reads Osage County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Osage City | 2,784 | −2.5% | 17.7% |
| Carbondale | 1,296 | −3.9% | 8.3% |
| Lyndon | 1,032 | −0.6% | 6.6% |
| Overbrook | 985 | −3.9% | 6.3% |
| Burlingame | 925 | −3.5% | 5.9% |
| Scranton | 637 | −2.3% | 4.1% |
| Melvern | 340 | −3.7% | 2.2% |
| Quenemo | 286 | −0.7% | 1.8% |
| Olivet | 75 | +2.7% | 0.5% |
9 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).
Osage County, Homes
Homes in Osage County
Osage County is a place of houses on their own lots: 83% of its 7,293 homes are detached single-family houses, against 72% across Kansas. Half of its homes were built before 1974, close to Kansas' 1975: 34% date from before 1960 and 14% from 2000 or later. Owners live in 80% of the occupied homes (Kansas: 67%), so for most households a test and a fix are their own to order.
| Homes | Osage County | Kansas |
|---|---|---|
| Housing units | 7,293 | 1,285,221 |
| Detached houses | 83% | 72% |
| In buildings of 5 or more | 3% | 13% |
| Mobile homes | 10% | 4% |
| Built before 1960 | 34% | 33% |
| Built since 2000 | 14% | 20% |
| Middle year built | 1974 | 1975 |
| Owner-occupied | 80% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.