Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Caldwell County, Missouri
EPA puts Caldwell County in Zone 2, its middle radon zone, and only 2 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
Highest bordering
38.9%
Ray County
- Ray
- 38.9%
- Livingston
- 22.4%
5 of 6 neighbours have 30+ tests, 2008 to 2017
Nearest county
38.9%
Ray County, 21 miles
- Ray
- 38.9%
- Missouri
- 30.6%
Share at 4+ pCi/L, 108 tests, 2008 to 2017
Ground above low
100.0%
5.8 pts above Missouri
- Caldwell
- 100.0%
- Missouri
- 94.2%
Share of land USGS rates moderate or high potential
Tests reported
19
Too few for a share
- Caldwell
- 19
- 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 Caldwell 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
Caldwell County, At a glance
Caldwell County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Caldwell 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 Caldwell County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2015 | 0.0% |
| 2016 | 0.0% |
| 2018 | 50.0% |
| 2019 | 0.0% |
| 2020 | 0.0% |
| 2021 | 0.0% |
| 2022 | 0.0% |
| 2023 | 0.0% |
2023: 0.0%. Across these years the share ran from 0.0% to 50.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 2 tests were reported to CDC for Caldwell 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).
Caldwell County, Compared
Caldwell County radon figures, compared
Calculated by Radon411CDC's largest figure for Caldwell County rests on 19 tests over the 2007 to 2016 laboratory totals, 1 of them at or above 4 pCi/L, so each test moves its share by 5.3 points and no rank or comparison is drawn from it. Results reached as high as 9.4 pCi/L, with a middle value of 1.4 pCi/L.
Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Ray County reported the largest share at or above 4 pCi/L, 38.9%, and Livingston County the smallest, 22.4%, with Clinton County at 38.1%, Daviess County at 26.7% and DeKalb County at 24.2% between. Farther out, Clay County (33 miles away) at 39.2%, Lafayette County (42 miles away) at 46.7% and Buchanan County (44 miles away) at 52.9% 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 Caldwell 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.
Caldwell County, Geology
The ground under Caldwell County
PredictedUSGS's geologic map puts all of Caldwell County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Dissected Till Plains, 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 |
|---|---|---|---|---|
| Dissected Till Plains | Till-covered Pennsylvanian sandstone, shale, and limestone. | 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.
Caldwell County beside the ground around it
Across Missouri 8.2% of the land is rated high; none of Caldwell County's is. Of the 6 counties that border it, 2 have more high-potential ground, Clinton County the most at 67.2%.
The map rates the ground, not the air in any home.
Local help
Caldwell County, Local resources
Radon testing and mitigation in Caldwell 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
Caldwell County, Questions
Questions about radon in Caldwell County
Are radon levels high in Caldwell County?
In 2023, 0.0% of the radon tests reported to CDC for Caldwell County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.1 pCi/L. Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Ray County reported the largest share at or above 4 pCi/L, 38.9%, and Livingston County the smallest, 22.4%, with Clinton County at 38.1%, Daviess County at 26.7% and DeKalb County at 24.2% between.
Which counties border Caldwell County?
Caldwell County borders 6 counties: Daviess County, Clinton County, Ray County, Livingston County, DeKalb County and Carroll County.
Products
Caldwell County, Products
Testing a home in Caldwell County
No CDC figure names Caldwell County; the nearest county with one, Ray County (21 miles away), reported 38.9% 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 Caldwell County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
MonitorAranet
Radon Plus battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Approved
- 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
Caldwell County, Bordering counties
Counties bordering Caldwell County
Calculated by Radon411- Radon levels in Ray CountyEPA zone 2
38.9%at or above 4 pCi/L
Median 2.5 pCi/L · 108 tests
- Radon levels in Clinton CountyEPA zone 1
38.1%at or above 4 pCi/L
Median 2.8 pCi/L · 105 tests
- Radon levels in Carroll CountyEPA zone 2
33.3%at or above 4 pCi/L
Median 2.7 pCi/L · 18 tests
- Radon levels in Daviess CountyEPA zone 2
26.7%at or above 4 pCi/L
Median 2.0 pCi/L · 30 tests
- Radon levels in DeKalb CountyEPA zone 2
24.2%at or above 4 pCi/L
Median 2.3 pCi/L · 33 tests
- Radon levels in Livingston CountyEPA zone 2
22.4%at or above 4 pCi/L
Median 2.1 pCi/L · 49 tests
Caldwell County, Cities and towns
Cities and towns in Caldwell County
The Census Bureau estimates 9,012 residents in Caldwell County for July 1, 2025, 186 more than in 2020 (+2.1%). That works out to 21 people per square mile of land. Cameron, the largest place on its list (7,341 residents in all), extends beyond Caldwell County, so no share of the total is worked out for it. Reported testing is thin here: 19 tests over 2007 to 2016, or 2.1 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 8.8.
From Cameron to Cowgill, CDC publishes no figure by town: each reads Caldwell County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Cameronextends beyond Caldwell County | 7,341 | −19.5% | Counted whole |
| Hamilton | 1,726 | +2.1% | 19.2% |
| Braymer | 756 | +2.3% | 8.4% |
| Polo | 508 | −0.8% | 5.6% |
| Kingston | 294 | −1.0% | 3.3% |
| Kidder | 284 | +6.0% | 3.2% |
| Breckenridge | 250 | −2.0% | 2.8% |
| Cowgill | 172 | +1.8% | 1.9% |
8 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 Caldwell County is counted whole, so it has no share.
Caldwell County, Homes
Homes in Caldwell County
Caldwell County is a place of houses on their own lots: 79% of its 4,269 homes are detached single-family houses, against 70% across Missouri. Half of its homes were built before 1973, close to Missouri's 1978: 35% date from before 1960 and 19% from 2000 or later. Owners live in 81% of the occupied homes (Missouri: 68%), so for most households a test and a fix are their own to order.
| Homes | Caldwell County | Missouri |
|---|---|---|
| Housing units | 4,269 | 2,809,501 |
| Detached houses | 79% | 70% |
| In buildings of 5 or more | 1% | 13% |
| Mobile homes | 13% | 5% |
| Built before 1960 | 35% | 28% |
| Built since 2000 | 19% | 21% |
| Middle year built | 1973 | 1978 |
| Owner-occupied | 81% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.