Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Moniteau County, Missouri
EPA puts Moniteau County in Zone 2, its middle radon zone, and only 4 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
25.7%
5.1 pts below MO
- Moniteau
- 25.7%
- Missouri
- 30.8%
70 tests, 2007 to 2016
Median result
2.3pCi/L
Below action level
- Moniteau
- 2.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2007 to 2016
Tests reported
70
46th of 72 by tests
- Moniteau
- 70
- St. Louis
- 16,567
Reported to CDC before any fix, 2007 to 2016
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
47 of 72
Middle half
- Moniteau
- 25.7%
- Atchison
- 70.5%
By share, of 72 with 30+ tests
Read a result for Moniteau County
Starts at Moniteau County's median, 2.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.3 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. Moniteau County's median reported result, 2007 to 2016.
The data
Moniteau County, At a glance
Moniteau County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Moniteau 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 Moniteau County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 100.0% |
| 2015 | 50.0% |
| 2016 | 0.0% |
| 2017 | 0.0% |
| 2021 | 0.0% |
| 2022 | 83.3% |
| 2023 | 75.0% |
2023: 75.0%. 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 4 tests were reported to CDC for Moniteau 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).
Moniteau County, Compared
Moniteau County radon figures, compared
Calculated by Radon411Moniteau County's 70 reported tests over the 2007 to 2016 laboratory totals had a middle value of 2.3 pCi/L and a maximum of 25.1 pCi/L, and 25.7% reached 4 pCi/L. Missouri as a whole (115 Missouri counties, pooled) comes to 30.8%: 5.1 points higher than here.
The newest figure, in 2023, counts only 4 tests (75.0% at or above 4 pCi/L), too few to compare, so this reading uses the 70-test figure.
Among its state's counties it ranks 47th of 72 Missouri counties with 30 or more tests for the same period. Statewide for the same period, Atchison County reported the highest share (70.5%) and Vernon County the lowest (9.1%).
Below the action level, 31 tests (44.3%) came in under 2 pCi/L, against 41.2% statewide, and 21 tests (30.0%) fell between 2 and 4, against 27.9% statewide. The busiest year on file was 2022, with 6 tests reported; the quietest, 2021, had 1.
EPA's 1993 zone map puts Moniteau County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Next door, the shares run from 14.0% in Miller County to 41.7% in Cooper County, with Morgan County, Boone County and Miller County below Moniteau County.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Moniteau County, Geology
The ground under Moniteau County
PredictedUSGS's geologic map puts all of Moniteau 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.
Moniteau County beside the ground around it
Across Missouri 8.2% of the land is rated high; none of Moniteau County's is. Of the 5 counties that border it, none has as large a share of moderate-potential ground; Cole County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Moniteau County, Local resources
Radon testing and mitigation in Moniteau 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
Moniteau County, Questions
Questions about radon in Moniteau County
Are radon levels high in Moniteau County?
In 2023, 75.0% of the radon tests reported to CDC for Moniteau County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.8 pCi/L. Of 72 Missouri counties with 30 or more tests for the same period, 46 reported a higher share; pooled, the state comes to 30.8%.
Which counties border Moniteau County?
Moniteau County borders 5 counties: Cooper County, Morgan County, Cole County, Boone County and Miller County.
Products
Moniteau County, Products
Testing a home in Moniteau County
In Moniteau County, 25.7% of 70 tests reported to CDC over the 2007 to 2016 laboratory totals reached 4 pCi/L, against 30.8% pooled across Missouri. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Moniteau 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
MonitorSafetySiren
Pro4 plug-in radon detector with a display and alarm
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 48 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Moniteau County, Bordering counties
Counties bordering Moniteau County
Calculated by Radon411- Radon levels in Cooper CountyEPA zone 2
41.7%at or above 4 pCi/L
Median 2.8 pCi/L · 84 tests · 16.0 points above Moniteau County
- Radon levels in Cole CountyEPA zone 2
25.7%at or above 4 pCi/L
Median 2.2 pCi/L · 790 tests · 0.0 points above Moniteau County
- Radon levels in Morgan CountyEPA zone 2
23.9%at or above 4 pCi/L
Median 2.3 pCi/L · 113 tests · 1.8 points below Moniteau County
- Radon levels in Boone CountyEPA zone 2
21.6%at or above 4 pCi/L
Median 1.9 pCi/L · 4,496 tests · 4.1 points below Moniteau County
- Radon levels in Miller CountyEPA zone 2
14.0%at or above 4 pCi/L
Median 1.8 pCi/L · 136 tests · 11.7 points below Moniteau County
Moniteau County, Cities and towns
Cities and towns in Moniteau County
The Census Bureau estimates 15,428 residents in Moniteau County for July 1, 2025, 205 more than in 2020 (+1.3%). That works out to 37 people per square mile of land. Its largest town, California, has 4,523 residents, 29.3% of the total. Together its 5 incorporated places hold 51.3% of those residents; the other 48.7% live outside any of them. Reported testing is thin here: 70 tests over 2007 to 2016, or 4.5 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 8.8.
From California to Lupus, CDC publishes no figure by town: each reads Moniteau County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| California | 4,523 | +0.5% | 29.3% |
| Tipton | 2,766 | +3.4% | 17.9% |
| Jamestown | 332 | +0.9% | 2.2% |
| Clarksburg | 257 | +2.0% | 1.7% |
| Lupus | 31 | Level | 0.2% |
5 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).
Moniteau County, Homes
Homes in Moniteau County
Moniteau County is a place of houses on their own lots: 81% of its 6,177 homes are detached single-family houses, against 70% across Missouri. Half of its homes were built before 1979, close to Missouri's 1978: 27% date from before 1960 and 20% from 2000 or later. Owners live in 78% of the occupied homes (Missouri: 68%), so for most households a test and a fix are their own to order.
| Homes | Moniteau County | Missouri |
|---|---|---|
| Housing units | 6,177 | 2,809,501 |
| Detached houses | 81% | 70% |
| In buildings of 5 or more | 2% | 13% |
| Mobile homes | 8% | 5% |
| Built before 1960 | 27% | 28% |
| Built since 2000 | 20% | 21% |
| Middle year built | 1979 | 1978 |
| Owner-occupied | 78% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.