Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Maries County, Missouri
EPA puts Maries County in Zone 2, its middle radon zone, and only 1 radon test from it is on file with CDC (2022). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
31.8%
Gasconade County
- Gasconade
- 31.8%
- Phelps
- 14.7%
5 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
15.4%
Osage County, 21 miles
- Osage
- 15.4%
- Missouri
- 30.6%
Share at 4+ pCi/L, 52 tests, 2008 to 2017
Ground above low
100.0%
5.8 pts above Missouri
- Maries
- 100.0%
- Missouri
- 94.2%
Share of land USGS rates moderate or high potential
Tests reported
22
Too few for a share
- Maries
- 22
- 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 Maries 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
Maries County, At a glance
Maries County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Maries 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 Maries County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 0.0% |
| 2017 | 0.0% |
| 2021 | 0.0% |
| 2022 | 0.0% |
2022: 0.0%. Across these years the share ran from 0.0% to 0.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 1 test was reported to CDC for Maries County over 2022, 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: 2022. Measured data period: 2005 to 2022 (every CDC figure on file).
Maries County, Compared
Maries County radon figures, compared
Calculated by Radon411CDC's largest figure for Maries County rests on 22 tests over the 2007 to 2016 laboratory totals, 3 of them at or above 4 pCi/L, so each test moves its share by 4.5 points and no rank or comparison is drawn from it. Results reached as high as 6.2 pCi/L, with a middle value of 1.6 pCi/L.
Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Gasconade County reported the largest share at or above 4 pCi/L, 31.8%, and Phelps County the smallest, 14.7%, with Pulaski County at 18.7%, Miller County at 16.9% and Osage County at 15.4% between. Farther out, Cole County (31 miles away) at 24.6%, Crawford County (36 miles away) at 14.7% and Callaway County (46 miles away) at 27.1% 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 Maries 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.
Maries County, Geology
The ground under Maries County
PredictedUSGS's geologic map puts all of Maries 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.
Maries County beside the ground around it
Across Missouri 8.2% of the land is rated high; none of Maries County's is. Of the 5 counties that border it, none has as large a share of moderate-potential ground; Gasconade County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Maries County, Local resources
Radon testing and mitigation in Maries 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
Maries County, Questions
Questions about radon in Maries County
Are radon levels high in Maries County?
In 2022, 0.0% of the radon tests reported to CDC for Maries County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.2 pCi/L. Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Gasconade County reported the largest share at or above 4 pCi/L, 31.8%, and Phelps County the smallest, 14.7%, with Pulaski County at 18.7%, Miller County at 16.9% and Osage County at 15.4% between.
Which counties border Maries County?
Maries County borders 5 counties: Phelps County, Osage County, Pulaski County, Miller County and Gasconade County.
Products
Maries County, Products
Testing a home in Maries County
No CDC figure names Maries County; the nearest county with one, Osage County (21 miles away), reported 15.4% 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 Maries 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
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Maries County, Bordering counties
Counties bordering Maries County
Calculated by Radon411- Radon levels in Gasconade CountyEPA zone 2
31.8%at or above 4 pCi/L
Median 2.3 pCi/L · 44 tests
- Radon levels in Pulaski CountyEPA zone 2
18.7%at or above 4 pCi/L
Median 1.3 pCi/L · 107 tests
- Radon levels in Miller CountyEPA zone 2
16.9%at or above 4 pCi/L
Median 1.9 pCi/L · 154 tests
- Radon levels in Osage CountyEPA zone 2
15.4%at or above 4 pCi/L
Median 1.5 pCi/L · 52 tests
- Radon levels in Phelps CountyEPA zone 2
14.7%at or above 4 pCi/L
Median 1.5 pCi/L · 204 tests
Maries County, Cities and towns
Cities and towns in Maries County
About 8,397 people live in Maries County by the Census Bureau's estimate for July 1, 2025, 58 fewer than in 2020 (−0.7%). That works out to 16 people per square mile of land. Belle, the largest place on its list (1,379 residents in all), extends beyond Maries County, so no share of the total is worked out for it. Reported testing is thin here: 22 tests over 2007 to 2016, or 2.6 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 8.8.
From Belle to Argyle, CDC publishes no figure by town: each reads Maries County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Belleextends beyond Maries County | 1,379 | −0.3% | Counted whole |
| Vienna | 572 | −0.9% | 6.8% |
| Argyleextends beyond Maries County | 145 | +1.4% | Counted whole |
3 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 Maries County is counted whole, so it has no share.
Maries County, Homes
Homes in Maries County
Maries County is a place of houses on their own lots: 75% of its 4,269 homes are detached single-family houses, against 70% across Missouri. Half of its homes were built before 1983, close to Missouri's 1978: 21% date from before 1960 and 24% 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 | Maries County | Missouri |
|---|---|---|
| Housing units | 4,269 | 2,809,501 |
| Detached houses | 75% | 70% |
| In buildings of 5 or more | 1% | 13% |
| Mobile homes | 15% | 5% |
| Built before 1960 | 21% | 28% |
| Built since 2000 | 24% | 21% |
| Middle year built | 1983 | 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.