Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Ozark County, Missouri
EPA puts Ozark County in Zone 2, its middle radon zone, and only 1 radon test from it is on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
45.7%
Howell County
- Howell
- 45.7%
- Taney
- 37.0%
2 of 6 neighbours have 30+ tests, 2008 to 2017
Nearest county
45.7%
Howell County, 32 miles
- Howell
- 45.7%
- Missouri
- 30.6%
Share at 4+ pCi/L, 138 tests, 2008 to 2017
Ground above low
100.0%
5.8 pts above Missouri
- Ozark
- 100.0%
- Missouri
- 94.2%
Share of land USGS rates moderate or high potential
Tests reported
8
Too few for a share
- Ozark
- 8
- Needed
- 30
2007 to 2016, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Ozark 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
Ozark County, At a glance
Ozark County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Ozark 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 Ozark County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2015 | 25.0% |
| 2016 | 0.0% |
| 2020 | 100.0% |
| 2022 | 50.0% |
| 2023 | 0.0% |
2023: 0.0%. Across these years the share ran from 0.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 1 test was reported to CDC for Ozark 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).
Ozark County, Compared
Ozark County radon figures, compared
Calculated by Radon411CDC's largest figure for Ozark County rests on 8 tests over the 2007 to 2016 laboratory totals, 2 of them at or above 4 pCi/L, so each test moves its share by 12.5 points and no rank or comparison is drawn from it. Results reached as high as 6.7 pCi/L, with a middle value of 0.4 pCi/L.
Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Howell County reported the largest share at or above 4 pCi/L, 45.7%, and Taney County the smallest, 37.0%. Farther out, Christian County (47 miles away) at 31.7%, Webster County (50 miles away) at 20.4% and Texas County (53 miles away) at 19.3% have figures too. Pooled across 115 Missouri counties, 30.6% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Atchison County reported the highest share (69.9%) and Vernon County the lowest (8.8%). EPA's 1993 map puts Ozark County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Ozark County, Geology
The ground under Ozark County
PredictedUSGS's geologic map puts all of Ozark 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.
Ozark County beside the ground around it
Across Missouri 8.2% of the land is rated high; none of Ozark County's is. Of the 6 counties that border it, none has as large a share of moderate-potential ground; Baxter County, AR comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Ozark County, Local resources
Radon testing and mitigation in Ozark 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
Ozark County, Questions
Questions about radon in Ozark County
Are radon levels high in Ozark County?
In 2023, 0.0% of the radon tests reported to CDC for Ozark County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Howell County reported the largest share at or above 4 pCi/L, 45.7%, and Taney County the smallest, 37.0%.
Which counties border Ozark County?
Ozark County borders 6 counties: Douglas County, MO, Baxter County, AR, Marion County, AR, Howell County, MO, Taney County, MO and Fulton County, AR.
Products
Ozark County, Products
Testing a home in Ozark County
No CDC figure names Ozark County; the nearest county with one, Howell County (32 miles away), reported 45.7% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Ozark 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
MonitorAranet
Radon One battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Ozark County, Bordering counties
Counties bordering Ozark County
Calculated by Radon411- Radon levels in Baxter County, AREPA zone 2
65.0%at or above 4 pCi/L
Median 5.3 pCi/L · 20 tests
- Radon levels in Fulton County, AREPA zone 2
50.0%at or above 4 pCi/L
Median 5.9 pCi/L · 2 tests
- Radon levels in Howell County, MOEPA zone 2
45.7%at or above 4 pCi/L
Median 3.5 pCi/L · 138 tests
- Radon levels in Taney County, MOEPA zone 2
37.0%at or above 4 pCi/L
Median 3.0 pCi/L · 146 tests
- Radon levels in Douglas County, MOEPA zone 2
0.0%at or above 4 pCi/L
Median 1.2 pCi/L · 3 tests
- Radon levels in Marion County, AREPA zone 2
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
Ozark County, Cities and towns
Cities and towns in Ozark County
Ozark County is growing: the Census Bureau puts it at 9,172 residents on July 1, 2025, up 7.7% from 8,518 in 2020. That works out to 12 people per square mile of land. No town dominates: Gainesville, the largest, has 784 residents, 8.5% of the total. Together its 3 incorporated places hold 12.9% of those residents; the other 87.1% live outside any of them. Reported testing is thin here: 8 tests over 2007 to 2016, or 0.9 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 8.8.
From Gainesville to Bakersfield, CDC publishes no figure by town: each reads Ozark County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Gainesville | 784 | +7.0% | 8.5% |
| Theodosia | 207 | +11.3% | 2.3% |
| Bakersfield | 191 | +4.9% | 2.1% |
3 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).
Ozark County, Homes
Homes in Ozark County
Ozark County is a place of houses on their own lots: 76% of its 5,046 homes are detached single-family houses, against 70% across Missouri. Half of its homes were built before 1979, close to Missouri's 1978: 20% date from before 1960 and 18% from 2000 or later. Owners live in 80% of the occupied homes (Missouri: 68%), so for most households a test and a fix are their own to order.
| Homes | Ozark County | Missouri |
|---|---|---|
| Housing units | 5,046 | 2,809,501 |
| Detached houses | 76% | 70% |
| In buildings of 5 or more | 1% | 13% |
| Mobile homes | 20% | 5% |
| Built before 1960 | 20% | 28% |
| Built since 2000 | 18% | 21% |
| Middle year built | 1979 | 1978 |
| Owner-occupied | 80% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.