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 Cedar County, Missouri
EPA puts Cedar 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
11.5%
Polk County
- Polk
- 11.5%
- Vernon
- 8.8%
2 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
11.5%
Polk County, 26 miles
- Polk
- 11.5%
- Missouri
- 30.6%
Share at 4+ pCi/L, 78 tests, 2008 to 2017
Ground above low
100.0%
5.8 pts above Missouri
- Cedar
- 100.0%
- Missouri
- 94.2%
Share of land USGS rates moderate or high potential
Tests reported
21
Too few for a share
- Cedar
- 21
- 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 Cedar 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
Cedar County, At a glance
Cedar County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Cedar 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 Cedar County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2015 | 50.0% |
| 2018 | 0.0% |
| 2019 | 0.0% |
| 2020 | 0.0% |
| 2022 | 0.0% |
| 2023 | 100.0% |
2023: 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 Cedar 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).
Cedar County, Compared
Cedar County radon figures, compared
Calculated by Radon411CDC's largest figure for Cedar County rests on 21 tests over the 2007 to 2016 laboratory totals, 1 of them at or above 4 pCi/L, so each test moves its share by 4.8 points and no rank or comparison is drawn from it. Results reached as high as 9.4 pCi/L, with a middle value of 1.3 pCi/L.
Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Polk County reported the largest share at or above 4 pCi/L, 11.5%, and Vernon County the smallest, 8.8%. Farther out, Lawrence County (43 miles away) at 27.1%, Greene County (43 miles away) at 32.7% and Jasper County (45 miles away) at 29.1% 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 Cedar 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.
Cedar County, Geology
The ground under Cedar County
PredictedUSGS's geologic map puts all of Cedar County's mapped land in one class: moderate radon potential. The map puts 71.5% of Cedar County in the area it calls Springfield Plateau and 26.5% in Osage Plains, 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 |
|---|---|---|---|---|
| Springfield Plateau | Mississippian limestone, shale, and sandstone. | Moderate | 11 | 71.5% |
| Osage Plains | Ordovician dolomite, sandstone, limestone, and shale. | Moderate | 11 | 26.5% |
| Salem Plateau | Ordovician dolomite, sandstone, limestone, and shale. | Moderate | 11 | 2.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Cedar County beside the ground around it
Across Missouri 8.2% of the land is rated high; none of Cedar County's is. Of the 5 counties that border it, none has as large a share of moderate-potential ground; Barton County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Cedar County, Local resources
Radon testing and mitigation in Cedar 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
Cedar County, Questions
Questions about radon in Cedar County
Are radon levels high in Cedar County?
In 2023, 100.0% of the radon tests reported to CDC for Cedar County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 7.1 pCi/L. Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Polk County reported the largest share at or above 4 pCi/L, 11.5%, and Vernon County the smallest, 8.8%.
Which counties border Cedar County?
Cedar County borders 5 counties: Dade County, St. Clair County, Polk County, Vernon County and Barton County.
Products
Cedar County, Products
Testing a home in Cedar County
No CDC figure names Cedar County; the nearest county with one, Polk County (26 miles away), reported 11.5% 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 Cedar 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
Cedar County, Bordering counties
Counties bordering Cedar County
Calculated by Radon411- Radon levels in Barton CountyEPA zone 2
16.7%at or above 4 pCi/L
Median 1.4 pCi/L · 24 tests
- Radon levels in Polk CountyEPA zone 2
11.5%at or above 4 pCi/L
Median 1.6 pCi/L · 78 tests
- Radon levels in Vernon CountyEPA zone 2
8.8%at or above 4 pCi/L
Median 0.9 pCi/L · 34 tests
- Radon levels in St. Clair CountyEPA zone 2
7.7%at or above 4 pCi/L
Median 1.5 pCi/L · 13 tests
- Radon levels in Dade CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 1.3 pCi/L · 7 tests
Cedar County, Cities and towns
Cities and towns in Cedar County
The Census Bureau estimates 14,888 residents in Cedar County for July 1, 2025, 678 more than in 2020 (+4.8%). That works out to 31 people per square mile of land. Its largest town, El Dorado Springs, has 3,642 residents, 24.5% of the total. Together its 4 incorporated places hold 38.1% of those residents; the other 61.9% live outside any of them. Reported testing is thin here: 21 tests over 2007 to 2016, or 1.4 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 8.8.
From El Dorado Springs to Umber View Heights, CDC publishes no figure by town: each reads Cedar County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| El Dorado Springs | 3,642 | +4.2% | 24.5% |
| Stockton | 1,825 | +8.1% | 12.3% |
| Jerico Springs | 168 | +5.0% | 1.1% |
| Umber View Heights | 43 | +4.9% | 0.3% |
4 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).
Cedar County, Homes
Homes in Cedar County
Of Cedar County's 6,964 homes, 75% are detached houses, against 70% across Missouri; 18% are mobile homes. Half of its homes were built before 1979, close to Missouri's 1978: 17% date from before 1960 and 24% from 2000 or later. 74% 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 | Cedar County | Missouri |
|---|---|---|
| Housing units | 6,964 | 2,809,501 |
| Detached houses | 75% | 70% |
| In buildings of 5 or more | 2% | 13% |
| Mobile homes | 18% | 5% |
| Built before 1960 | 17% | 28% |
| Built since 2000 | 24% | 21% |
| Middle year built | 1979 | 1978 |
| Owner-occupied | 74% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.