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 Stoddard County, Missouri
EPA puts Stoddard County in Zone 3, its lowest radon zone, and only 1 radon test from it is on file with CDC (2020). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
35.2%
Cape Girardeau County
- Cape Girardeau
- 35.2%
- Butler
- 21.2%
3 of 7 neighbours have 30+ tests, 2008 to 2017
Nearest county
29.4%
Scott County, 25 miles
- Scott
- 29.4%
- Missouri
- 30.6%
Share at 4+ pCi/L, 51 tests, 2008 to 2017
Ground above low
0.4%
93.8 pts below Missouri
- Stoddard
- 0.4%
- Missouri
- 94.2%
Share of land USGS rates moderate or high potential
Tests reported
25
Too few for a share
- Stoddard
- 25
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Stoddard 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
Stoddard County, At a glance
Stoddard County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Stoddard County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2015 | 0.0% |
| 2016 | 0.0% |
| 2017 | 0.0% |
| 2018 | 0.0% |
| 2019 | 0.0% |
| 2020 | 100.0% |
2020: 100.0%. 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 Stoddard County over 2020, 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: 2020. Measured data period: 2005 to 2023 (every CDC figure on file).
Stoddard County, Compared
Stoddard County radon figures, compared
Calculated by Radon411CDC's largest figure for Stoddard County rests on 25 tests over the 2008 to 2017 laboratory totals, 3 of them at or above 4 pCi/L, so each test moves its share by 4.0 points and no rank or comparison is drawn from it. Results reached as high as 5.5 pCi/L, with a middle value of 1.1 pCi/L.
Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Cape Girardeau County reported the largest share at or above 4 pCi/L, 35.2%, and Butler County the smallest, 21.2%, with Scott County at 29.4% between. Farther out, Perry County (59 miles away) at 37.8%, St. Francois County (72 miles away) at 41.1% and Ste. Genevieve County (73 miles away) at 31.1% 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 Stoddard County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Stoddard County, Geology
The ground under Stoddard County
PredictedMost of the ground under Stoddard County is one class on USGS's geologic map: 99.6% of its land is low radon potential, with 0.4% moderate. All of it lies in the area the map calls Coastal Plains Province, to which USGS gives a radon index of 5, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Coastal Plains Province | Tertiary-Quaternary sandstone, shale, and alluvium. | Low | 5 | 99.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Stoddard County beside the ground around it
Across Missouri 8.2% of the land is rated high; none of Stoddard County's is. Of the 7 counties that border it, 1 has more high-potential ground, Wayne County the most at 12.4%.
The map rates the ground, not the air in any home.
Local help
Stoddard County, Local resources
Radon testing and mitigation in Stoddard County
Listed radon businesses with an address in Stoddard 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.
Listed radon professionals by town: Dexter
What Missouri's program says
- Phone
- 573-751-6102
- radon@health.mo.gov
What it means
Stoddard County, Questions
Questions about radon in Stoddard County
Are radon levels high in Stoddard County?
In 2020, 100.0% of the radon tests reported to CDC for Stoddard County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 7.8 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Cape Girardeau County reported the largest share at or above 4 pCi/L, 35.2%, and Butler County the smallest, 21.2%, with Scott County at 29.4% between.
Which counties border Stoddard County?
Stoddard County borders 7 counties: New Madrid County, Scott County, Butler County, Wayne County, Dunklin County, Bollinger County and Cape Girardeau County.
Products
Stoddard County, Products
Testing a home in Stoddard County
No CDC figure names Stoddard County; the nearest county with one, Scott County (25 miles away), reported 29.4% 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. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Stoddard County.
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
Stoddard County, Bordering counties
Counties bordering Stoddard County
Calculated by Radon411- Radon levels in Cape Girardeau CountyEPA zone 2
35.2%at or above 4 pCi/L
Median 2.8 pCi/L · 253 tests
- Radon levels in Scott CountyEPA zone 3
29.4%at or above 4 pCi/L
Median 2.2 pCi/L · 51 tests
- Radon levels in Wayne CountyEPA zone 2
23.5%at or above 4 pCi/L
Median 1.9 pCi/L · 17 tests
- Radon levels in Butler CountyEPA zone 3
21.2%at or above 4 pCi/L
Median 1.9 pCi/L · 33 tests
- Radon levels in New Madrid CountyEPA zone 3
11.1%at or above 4 pCi/L
Median 1.4 pCi/L · 9 tests
- Radon levels in Dunklin CountyEPA zone 3
6.3%at or above 4 pCi/L
Median 1.3 pCi/L · 16 tests
- Radon levels in Bollinger CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 1.4 pCi/L · 6 tests
Stoddard County, Cities and towns
Cities and towns in Stoddard County
About 28,284 people live in Stoddard County by the Census Bureau's estimate for July 1, 2025, 372 fewer than in 2020 (−1.3%). That works out to 34 people per square mile of land. Its largest town, Dexter, has 7,851 residents, 27.8% of the total. Together its 9 incorporated places hold 51.6% of those residents; the other 48.4% live outside any of them. Reported testing is thin here: 25 tests over 2008 to 2017, or 0.9 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 9.3.
From Dexter to Penermon, CDC publishes no figure by town: each reads Stoddard County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Dexter | 7,851 | −1.2% | 27.8% |
| Bernie | 1,828 | −1.4% | 6.5% |
| Bloomfield | 1,734 | −1.4% | 6.1% |
| Advance | 1,323 | −1.3% | 4.7% |
| Puxico | 867 | −1.5% | 3.1% |
| Bell City | 453 | −0.7% | 1.6% |
| Essex | 390 | −2.0% | 1.4% |
| Dudley | 101 | −1.9% | 0.4% |
| Penermon | 49 | −2.0% | 0.2% |
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).
Stoddard County, Homes
Homes in Stoddard County
Stoddard County is a place of houses on their own lots: 79% of its 13,398 homes are detached single-family houses, against 70% across Missouri. Half of its homes were built before 1975, close to Missouri's 1978: 26% date from before 1960 and 17% from 2000 or later. 71% of occupied homes are lived in by their owner (Missouri: 68%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Stoddard County | Missouri |
|---|---|---|
| Housing units | 13,398 | 2,809,501 |
| Detached houses | 79% | 70% |
| In buildings of 5 or more | 2% | 13% |
| Mobile homes | 9% | 5% |
| Built before 1960 | 26% | 28% |
| Built since 2000 | 17% | 21% |
| Middle year built | 1975 | 1978 |
| Owner-occupied | 71% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.