Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in Cooper County, Missouri
EPA puts Cooper County in Zone 2, its middle radon zone, and only 3 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
41.1%
10.5 pts above MO
- Cooper
- 41.1%
- Missouri
- 30.6%
90 tests, 2008 to 2017
Median result
2.6pCi/L
Below action level
- Cooper
- 2.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
90
42nd of 72 by tests
- Cooper
- 90
- St. Louis
- 17,747
Reported to CDC before any fix, 2008 to 2017
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
14 of 72
Top quarter
- Cooper
- 41.1%
- Atchison
- 69.9%
By share, of 72 with 30+ tests
Read a result for Cooper County
Starts at Cooper County's median, 2.6 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.6 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. Cooper County's median reported result, 2008 to 2017.
The data
Cooper County, At a glance
Cooper County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Cooper 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 Cooper County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 33.3% |
| 2015 | 50.0% |
| 2016 | 33.3% |
| 2017 | 0.0% |
| 2019 | 0.0% |
| 2020 | 0.0% |
| 2021 | 50.0% |
| 2022 | 33.3% |
| 2023 | 33.3% |
2023: 33.3%. 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 3 tests were reported to CDC for Cooper 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).
Cooper County, Compared
Cooper County radon figures, compared
Calculated by Radon411In Cooper County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (37 of 90) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 5.4 points higher. Across 115 Missouri counties pooled together, 30.6% of tests reached that level, so Cooper County runs 10.5 points above its state.
The newest figure, in 2023, counts only 3 tests (33.3% at or above 4 pCi/L), too few to compare, so this reading uses the 90-test figure.
Of 6 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 21.1% (Morgan County) to 49.1% (Saline County). By share, Cooper County is 14th of 72 Missouri counties with 30 or more tests for the same period.
Half the tests came in under 2.6 pCi/L and half over it; the single highest reached 21.5 pCi/L. Below the action level, 28 tests (31.1%) came in under 2 pCi/L, against 41.2% statewide, and 25 tests (27.8%) fell between 2 and 4, against 28.1% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 41.1% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential.
The busiest year on file was 2015, with 6 tests reported; the quietest, 2020, had 1.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Cooper County, Geology
The ground under Cooper County
PredictedUSGS's geologic map puts all of Cooper County's mapped land in one class: moderate radon potential. 97.7% 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 | 97.7% |
| Osage Plains | Ordovician dolomite, sandstone, limestone, and shale. | Moderate | 11 | 2.3% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Cooper County beside the ground around it
Across Missouri 8.2% of the land is rated high; none of Cooper County's is. Of the 6 counties that border it, none has as large a share of moderate-potential ground; Howard County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Cooper County, Local resources
Radon testing and mitigation in Cooper 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
Cooper County, Questions
Questions about radon in Cooper County
Are radon levels high in Cooper County?
In 2023, 33.3% of the radon tests reported to CDC for Cooper County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.6 pCi/L. Of 72 Missouri counties with 30 or more tests for the same period, 13 reported a higher share; pooled, the state comes to 30.6%.
Which counties border Cooper County?
Cooper County borders 6 counties: Moniteau County, Morgan County, Pettis County, Howard County, Boone County and Saline County.
Products
Cooper County, Products
Testing a home in Cooper County
In Cooper County, 41.1% of 90 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 30.6% pooled across Missouri. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Cooper 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
Monitor
Corentium Home 2 battery digital radon monitor
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Screen, app
Method: Alpha spectrometry
Readings: Every 60 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Cooper County, Bordering counties
Counties bordering Cooper County
Calculated by Radon411- Radon levels in Saline CountyEPA zone 2
49.1%at or above 4 pCi/L
Median 3.7 pCi/L · 55 tests · 8.0 points above Cooper County
- Radon levels in Howard CountyEPA zone 2
43.5%at or above 4 pCi/L
Median 3.5 pCi/L · 62 tests · 2.4 points above Cooper County
- Radon levels in Pettis CountyEPA zone 2
37.9%at or above 4 pCi/L
Median 2.8 pCi/L · 132 tests · 3.2 points below Cooper County
- Radon levels in Moniteau CountyEPA zone 2
25.0%at or above 4 pCi/L
Median 2.2 pCi/L · 68 tests · 16.1 points below Cooper County
- Radon levels in Boone CountyEPA zone 2
21.7%at or above 4 pCi/L
Median 1.9 pCi/L · 4,767 tests · 19.4 points below Cooper County
- Radon levels in Morgan CountyEPA zone 2
21.1%at or above 4 pCi/L
Median 2.2 pCi/L · 123 tests · 20.0 points below Cooper County
Cooper County, Cities and towns
Cities and towns in Cooper County
The Census Bureau estimates 17,136 residents in Cooper County for July 1, 2025, 493 more than in 2020 (+3.0%). That works out to 30 people per square mile of land. Its largest town, Boonville, has 7,867 residents, 45.9% of the total. Together its 8 incorporated places hold 59.5% of those residents; the other 40.5% live outside any of them. Reported testing is thin here: 90 tests over 2008 to 2017, or 5.3 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 9.3.
From Boonville to Wooldridge, CDC publishes no figure by town: each reads Cooper County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Boonville | 7,867 | +3.7% | 45.9% |
| Pilot Grove | 693 | +4.5% | 4.0% |
| Otterville | 450 | +1.8% | 2.6% |
| Windsor Place | 361 | +2.3% | 2.1% |
| Bunceton | 338 | +1.5% | 2.0% |
| Prairie Home | 268 | +2.3% | 1.6% |
| Blackwater | 192 | +3.8% | 1.1% |
| Wooldridge | 27 | Level | 0.2% |
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).
Cooper County, Homes
Homes in Cooper County
Cooper County is a place of houses on their own lots: 82% of its 7,276 homes are detached single-family houses, against 70% across Missouri. Half of its homes were built before 1974, close to Missouri's 1978: 33% date from before 1960 and 18% 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 | Cooper County | Missouri |
|---|---|---|
| Housing units | 7,276 | 2,809,501 |
| Detached houses | 82% | 70% |
| In buildings of 5 or more | 4% | 13% |
| Mobile homes | 6% | 5% |
| Built before 1960 | 33% | 28% |
| Built since 2000 | 18% | 21% |
| Middle year built | 1974 | 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.