Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Stone County, Missouri
EPA puts Stone County in Zone 2, its middle radon zone, and only 6 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
41.6%
11.0 pts above MO
- Stone
- 41.6%
- Missouri
- 30.6%
137 tests, 2008 to 2017
Median result
2.9pCi/L
Below action level
- Stone
- 2.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
137
32nd of 72 by tests
- Stone
- 137
- St. Louis
- 17,747
Reported to CDC before any fix, 2008 to 2017
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
12 of 72
Top quarter
- Stone
- 41.6%
- Atchison
- 69.9%
By share, of 72 with 30+ tests
Read a result for Stone County
Starts at Stone County's median, 2.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.9 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. Stone County's median reported result, 2008 to 2017.
The data
Stone County, At a glance
Stone County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Stone 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 Stone County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 45.5% |
| 2015 | 80.0% |
| 2016 | 42.1% |
| 2017 | 12.5% |
| 2018 | 40.0% |
| 2019 | 0.0% |
| 2020 | 41.7% |
| 2021 | 25.0% |
| 2022 | 45.5% |
| 2023 | 33.3% |
2023: 33.3%. Across these years the share ran from 0.0% to 80.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 6 tests were reported to CDC for Stone County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Stone County, Compared
Stone County radon figures, compared
Calculated by Radon411In Stone County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (57 of 137) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 5.9 points higher. Across 115 Missouri counties pooled together, 30.6% of tests reached that level, so Stone County runs 11.0 points above its state.
The newest figure, in 2023, counts only 6 tests (33.3% at or above 4 pCi/L), too few to compare, so this reading uses the 137-test figure.
Of 4 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 27.1% (Lawrence County) to 41.8% (Barry County). By share, Stone County is 12th of 72 Missouri counties with 30 or more tests for the same period.
Half the tests came in under 2.9 pCi/L and half over it; the single highest reached 79.3 pCi/L. Below the action level, 49 tests (35.8%) came in under 2 pCi/L, against 41.2% statewide, and 31 tests (22.6%) fell between 2 and 4, against 28.1% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 41.6% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential. CDC also counts 14 tests taken after mitigation in Stone County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2022, with 22 tests reported; the quietest, 2019, had 3.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Stone County, Geology
The ground under Stone County
PredictedUSGS's geologic map puts all of Stone County's mapped land in one class: moderate radon potential. The map puts 56.5% of Stone County in the area it calls Salem Plateau and 38.8% in Springfield Plateau, with one smaller area beside them. USGS gives both 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 | 56.5% |
| Springfield Plateau | Mississippian limestone, shale, and sandstone. | Moderate | 11 | 38.8% |
| Springfield Plateau | Mississippian limestone, shale, and sandstone. | Moderate | 9 | 4.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Stone County beside the ground around it
Across Missouri 8.2% of the land is rated high; none of Stone County's is. Of the 5 counties that border it, none has as large a share of moderate-potential ground; Barry County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Stone County, Local resources
Radon testing and mitigation in Stone 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
Stone County, Questions
Questions about radon in Stone County
Are radon levels high in Stone County?
In 2023, 33.3% of the radon tests reported to CDC for Stone County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.4 pCi/L. Of 72 Missouri counties with 30 or more tests for the same period, 11 reported a higher share; pooled, the state comes to 30.6%.
Which counties border Stone County?
Stone County borders 5 counties: Barry County, MO, Taney County, MO, Carroll County, AR, Christian County, MO and Lawrence County, MO.
Products
Stone County, Products
Testing a home in Stone County
In Stone County, 41.6% of 137 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 30.6% pooled across Missouri. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Stone 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
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
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Stone County, Bordering counties
Counties bordering Stone County
Calculated by Radon411- Radon levels in Barry County, MOEPA zone 2
41.8%at or above 4 pCi/L
Median 3.1 pCi/L · 55 tests · 0.2 points above Stone County
- Radon levels in Taney County, MOEPA zone 2
37.0%at or above 4 pCi/L
Median 3.0 pCi/L · 146 tests · 4.6 points below Stone County
- Radon levels in Christian County, MOEPA zone 2
31.7%at or above 4 pCi/L
Median 1.9 pCi/L · 436 tests · 9.9 points below Stone County
- Radon levels in Carroll County, AREPA zone 2
29.4%at or above 4 pCi/L
Median 2.0 pCi/L · 17 tests · 12.2 points below Stone County
- Radon levels in Lawrence County, MOEPA zone 2
27.1%at or above 4 pCi/L
Median 1.8 pCi/L · 70 tests · 14.5 points below Stone County
Stone County, Cities and towns
Cities and towns in Stone County
The Census Bureau estimates 32,503 residents in Stone County for July 1, 2025, 1,291 more than in 2020 (+4.1%). That works out to 70 people per square mile of land. Branson, the largest place on its list (12,921 residents in all), extends beyond Stone County, so no share of the total is worked out for it. Reported testing is thin here: 137 tests over 2008 to 2017, or 4.2 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 9.3.
From Branson to Coney Island, CDC publishes no figure by town: each reads Stone County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Bransonextends beyond Stone County | 12,921 | +2.2% | Counted whole |
| Kimberling City | 2,345 | −0.4% | 7.2% |
| Crane | 1,509 | −1.4% | 4.6% |
| Reeds Spring | 1,223 | +7.2% | 3.8% |
| Indian Point | 580 | +3.9% | 1.8% |
| Branson West | 485 | +1.7% | 1.5% |
| Galena | 474 | +4.4% | 1.5% |
| Blue Eye | 310 | +4.4% | 1.0% |
| McCord Bend | 225 | +4.7% | 0.7% |
| Hurley | 178 | +2.9% | 0.5% |
| Coney Island | 46 | +4.5% | 0.1% |
11 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 Stone County is counted whole, so it has no share.
Stone County, Homes
Homes in Stone County
Of Stone County's 20,267 homes, 73% are detached houses, against 70% across Missouri; 12% are mobile homes. Much of Stone County is recent building: 30% of its homes have gone up since 2000 and the middle year built is 1992, against 1978 for Missouri. Owners live in 84% of the occupied homes (Missouri: 68%), so for most households a test and a fix are their own to order.
| Homes | Stone County | Missouri |
|---|---|---|
| Housing units | 20,267 | 2,809,501 |
| Detached houses | 73% | 70% |
| In buildings of 5 or more | 9% | 13% |
| Mobile homes | 12% | 5% |
| Built before 1960 | 8% | 28% |
| Built since 2000 | 30% | 21% |
| Middle year built | 1992 | 1978 |
| Owner-occupied | 84% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.