Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Miller County, Missouri
EPA puts Miller 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
16.9%
13.7 pts below MO
- Miller
- 16.9%
- Missouri
- 30.6%
154 tests, 2008 to 2017
Median result
1.9pCi/L
Below action level
- Miller
- 1.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
154
28th of 72 by tests
- Miller
- 154
- 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
65 of 72
Lowest quarter
- Miller
- 16.9%
- Atchison
- 69.9%
By share, of 72 with 30+ tests
Read a result for Miller County
Starts at Miller County's median, 1.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.9 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Miller County's median reported result, 2008 to 2017.
The data
Miller County, At a glance
Miller County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Miller 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 Miller County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2015 | 0.0% |
| 2016 | 0.0% |
| 2017 | 44.4% |
| 2018 | 100.0% |
| 2020 | 0.0% |
| 2021 | 60.0% |
| 2022 | 60.0% |
| 2023 | 0.0% |
2023: 0.0%. 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 Miller 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).
Miller County, Compared
Miller County radon figures, compared
Calculated by Radon411Miller County's 154 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.9 pCi/L and a maximum of 23.1 pCi/L, and 16.9% reached 4 pCi/L. Missouri as a whole (115 Missouri counties, pooled) comes to 30.6%: 13.7 points higher than here.
The newest figure, in 2023, counts only 4 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 154-test figure.
Among its state's counties it ranks 65th of 72 Missouri counties with 30 or more tests for the same period. Statewide for the same period, Atchison County reported the highest share (69.9%) and Vernon County the lowest (8.8%).
Below the action level, 83 tests (53.9%) came in under 2 pCi/L, against 41.2% statewide, and 45 tests (29.2%) fell between 2 and 4, against 28.1% statewide. The busiest year on file was 2022, with 10 tests reported; the quietest, 2018, had 1.
EPA's 1993 zone map puts Miller 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 15.4% in Osage County to 25.0% in Moniteau County, with Osage County below Miller County.
CDC also counts 6 tests taken after mitigation in Miller County for the same period: tests in homes where a fix was already in.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Miller County, Geology
The ground under Miller County
PredictedUSGS's geologic map puts all of Miller 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.
Miller County beside the ground around it
Across Missouri 8.2% of the land is rated high; none of Miller County's is. Of the 7 counties that border it, none has as large a share of moderate-potential ground; Camden County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Miller County, Local resources
Radon testing and mitigation in Miller 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
Miller County, Questions
Questions about radon in Miller County
Are radon levels high in Miller County?
In 2023, 0.0% of the radon tests reported to CDC for Miller County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of 72 Missouri counties with 30 or more tests for the same period, 64 reported a higher share; pooled, the state comes to 30.6%.
Which counties border Miller County?
Miller County borders 7 counties: Cole County, Camden County, Morgan County, Moniteau County, Maries County, Pulaski County and Osage County.
Products
Miller County, Products
Testing a home in Miller County
In Miller County, 16.9% of 154 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 Miller 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
MonitorPYZYCKYH
RD17 plug-in radon detector with a rechargeable battery and color screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Miller County, Bordering counties
Counties bordering Miller County
Calculated by Radon411- Radon levels in Moniteau CountyEPA zone 2
25.0%at or above 4 pCi/L
Median 2.2 pCi/L · 68 tests · 8.1 points above Miller County
- Radon levels in Cole CountyEPA zone 2
24.6%at or above 4 pCi/L
Median 2.1 pCi/L · 768 tests · 7.7 points above Miller County
- Radon levels in Camden CountyEPA zone 2
22.9%at or above 4 pCi/L
Median 2.2 pCi/L · 763 tests · 6.0 points above Miller County
- Radon levels in Morgan CountyEPA zone 2
21.1%at or above 4 pCi/L
Median 2.2 pCi/L · 123 tests · 4.2 points above Miller County
- Radon levels in Pulaski CountyEPA zone 2
18.7%at or above 4 pCi/L
Median 1.3 pCi/L · 107 tests · 1.8 points above Miller County
- Radon levels in Osage CountyEPA zone 2
15.4%at or above 4 pCi/L
Median 1.5 pCi/L · 52 tests · 1.5 points below Miller County
- Radon levels in Maries CountyEPA zone 2
14.3%at or above 4 pCi/L
Median 1.8 pCi/L · 21 tests · 2.6 points below Miller County
Miller County, Cities and towns
Cities and towns in Miller County
The Census Bureau estimates 25,817 residents in Miller County for July 1, 2025, 1,045 more than in 2020 (+4.2%). That works out to 44 people per square mile of land. Osage Beach, the largest place on its list (5,079 residents in all), extends beyond Miller County, so no share of the total is worked out for it. Reported testing is thin here: 154 tests over 2008 to 2017, or 6.0 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 9.3.
From Osage Beach to Bagnell, CDC publishes no figure by town: each reads Miller County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Osage Beachextends beyond Miller County | 5,079 | +8.5% | Counted whole |
| Eldon | 4,785 | +9.1% | 18.5% |
| Lake Ozarkextends beyond Miller County | 2,247 | +8.1% | Counted whole |
| Iberia | 722 | +1.7% | 2.8% |
| St. Elizabeth | 435 | +1.9% | 1.7% |
| Tuscumbia | 192 | +1.6% | 0.7% |
| Olean | 121 | +2.5% | 0.5% |
| Brumley | 72 | +2.9% | 0.3% |
| Bagnell | 43 | +4.9% | 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). A place that extends beyond Miller County is counted whole, so it has no share.
Miller County, Homes
Homes in Miller County
Of Miller County's 12,508 homes, 70% are detached houses, against 70% across Missouri; 11% are mobile homes. Half of its homes were built before 1985, close to Missouri's 1978: 14% date from before 1960 and 26% from 2000 or later. Owners live in 76% of the occupied homes (Missouri: 68%), so for most households a test and a fix are their own to order.
| Homes | Miller County | Missouri |
|---|---|---|
| Housing units | 12,508 | 2,809,501 |
| Detached houses | 70% | 70% |
| In buildings of 5 or more | 10% | 13% |
| Mobile homes | 11% | 5% |
| Built before 1960 | 14% | 28% |
| Built since 2000 | 26% | 21% |
| Middle year built | 1985 | 1978 |
| Owner-occupied | 76% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.