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
Locations and reports
Radon Levels in Nodaway County, Missouri
EPA puts Nodaway County in Zone 1, its highest radon zone, and only 13 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
34.2%
3.6 pts above MO
- Nodaway
- 34.2%
- Missouri
- 30.6%
225 tests, 2008 to 2017
Median result
2.7pCi/L
Below action level
- Nodaway
- 2.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
225
22nd of 72 by tests
- Nodaway
- 225
- St. Louis
- 17,747
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Missouri
28 of 72
Middle half
- Nodaway
- 34.2%
- Atchison
- 69.9%
By share, of 72 with 30+ tests
Read a result for Nodaway County
Starts at Nodaway County's median, 2.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.7 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. Nodaway County's median reported result, 2008 to 2017.
The data
Nodaway County, At a glance
Nodaway County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Nodaway County in
USGS geologic potential: High across 80% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Nodaway County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 54.2% |
| 2015 | 37.5% |
| 2016 | 28.6% |
| 2017 | 22.7% |
| 2018 | 75.0% |
| 2019 | 0.0% |
| 2020 | 60.0% |
| 2021 | 71.4% |
| 2022 | 64.3% |
| 2023 | 61.5% |
2023: 61.5%. Across these years the share ran from 0.0% to 75.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 13 tests were reported to CDC for Nodaway 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).
Nodaway County, Compared
Nodaway County radon figures, compared
Calculated by Radon411In Nodaway County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (77 of 225) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 1.5 points lower. Across 115 Missouri counties pooled together, 30.6% of tests reached that level, so Nodaway County runs 3.6 points above its state.
The newest figure, in 2023, counts only 13 tests (61.5% at or above 4 pCi/L), too few to compare, so this reading uses the 225-test figure.
Of 4 neighbours with a figure, all 4 reported a larger share at or above 4 pCi/L; the spread is 60.8% (Andrew County) to 71.7% (Page County, IA). By share, Nodaway County is 28th of 72 Missouri counties with 30 or more tests for the same period.
Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 28.2 pCi/L. Below the action level, 75 tests (33.3%) came in under 2 pCi/L, against 41.2% statewide, and 73 tests (32.4%) fell between 2 and 4, against 28.1% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 34.2% share point the same way here. USGS geology rates 80% of the county's land high radon potential. CDC also counts 5 tests taken after mitigation in Nodaway County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2014, with 24 tests reported; the quietest, 2019, had 4.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Nodaway County, Geology
The ground under Nodaway County
PredictedMost of the ground under Nodaway County is one class on USGS's geologic map: 79.9% of its land is high radon potential, with 20.1% moderate. The map puts 79.9% of Nodaway County in the area it calls Northwestern Dissected Till Plains and 20.1% in Dissected Till Plains. USGS gives the first a radon index of 13, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Northwestern Dissected Till Plains | Pennsylvanian shales covered by thick loess. | High | 13 | 79.9% |
| Dissected Till Plains | Till-covered Pennsylvanian sandstone, shale, and limestone. | Moderate | 11 | 20.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Nodaway County beside the ground around it
Nodaway County has more high-potential ground than Missouri as a whole: 79.9% of its land against 8.2%. Of the 7 counties that border it, 5 have more high-potential ground, Page County, IA the most at 100%.
The map rates the ground, not the air in any home.
Local help
Nodaway County, Local resources
Radon testing and mitigation in Nodaway 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
Nodaway County, Questions
Questions about radon in Nodaway County
Are radon levels high in Nodaway County?
In 2023, 61.5% of the radon tests reported to CDC for Nodaway County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.8 pCi/L. Of 72 Missouri counties with 30 or more tests for the same period, 27 reported a higher share; pooled, the state comes to 30.6%.
Which counties border Nodaway County?
Nodaway County borders 7 counties: Andrew County, MO, Holt County, MO, Gentry County, MO, Worth County, MO, Atchison County, MO, Taylor County, IA and Page County, IA.
Products
Nodaway County, Products
Testing a home in Nodaway County
In Nodaway County, 34.2% of 225 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 30.6% pooled across Missouri. In Zone 1 the year-round level in Nodaway County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
Monitor
RadonEye RD200 plug-in continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
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
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Nodaway County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Nodaway County
Explore
Nodaway County, Bordering counties
Counties bordering Nodaway County
Calculated by Radon411- Radon levels in Page County, IAEPA zone 1
71.7%at or above 4 pCi/L
Median 7.2 pCi/L · 653 tests · 37.5 points above Nodaway County
- Radon levels in Atchison County, MOEPA zone 1
69.9%at or above 4 pCi/L
Median 5.6 pCi/L · 103 tests · 35.7 points above Nodaway County
- Radon levels in Holt County, MOEPA zone 1
62.1%at or above 4 pCi/L
Median 4.9 pCi/L · 29 tests · 27.9 points above Nodaway County
- Radon levels in Taylor County, IAEPA zone 1
60.9%at or above 4 pCi/L
Median 4.6 pCi/L · 235 tests · 26.7 points above Nodaway County
- Radon levels in Andrew County, MOEPA zone 1
60.8%at or above 4 pCi/L
Median 4.9 pCi/L · 158 tests · 26.6 points above Nodaway County
- Radon levels in Gentry County, MOEPA zone 2
41.7%at or above 4 pCi/L
Median 3.5 pCi/L · 24 tests · 7.5 points above Nodaway County
- Radon levels in Worth County, MOEPA zone 2
9.1%at or above 4 pCi/L
Median 1.5 pCi/L · 11 tests · 25.1 points below Nodaway County
Nodaway County, Cities and towns
Cities and towns in Nodaway County
About 20,174 people live in Nodaway County by the Census Bureau's estimate for July 1, 2025, 847 fewer than in 2020 (−4.0%). That works out to 23 people per square mile of land. Maryville alone is home to 10,092 of them, 50.0% of the total. Together its 15 incorporated places hold 63.5% of those residents; the other 36.5% live outside any of them. CDC's 225 reported tests for 2008 to 2017 work out to 11.2 per 1,000 residents (2025 estimate), close to Missouri's 9.3.
From Maryville to Clyde, CDC publishes no figure by town: each reads Nodaway County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Maryville | 10,092 | −5.0% | 50.0% |
| Burlington Junction | 483 | −6.9% | 2.4% |
| Hopkins | 437 | −7.2% | 2.2% |
| Ravenwood | 409 | −6.4% | 2.0% |
| Skidmore | 226 | −7.4% | 1.1% |
| Barnard | 185 | −7.5% | 0.9% |
| Conception Junction | 166 | −7.8% | 0.8% |
| Clearmont | 147 | −7.0% | 0.7% |
| Pickering | 140 | −6.7% | 0.7% |
| Graham | 138 | −7.4% | 0.7% |
| Parnell | 129 | −6.5% | 0.6% |
| Elmo | 105 | −7.9% | 0.5% |
- Guilford
- Arkoe
- Clyde
15 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).
Nodaway County, Homes
Homes in Nodaway County
Of Nodaway County's 9,478 homes, 69% are detached houses, against 70% across Missouri; 12% are in buildings of five or more homes. Half of its homes were built before 1977, close to Missouri's 1978: 31% date from before 1960 and 22% from 2000 or later. 62% of occupied homes are lived in by their owner (Missouri: 68%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Nodaway County | Missouri |
|---|---|---|
| Housing units | 9,478 | 2,809,501 |
| Detached houses | 69% | 70% |
| In buildings of 5 or more | 12% | 13% |
| Mobile homes | 5% | 5% |
| Built before 1960 | 31% | 28% |
| Built since 2000 | 22% | 21% |
| Middle year built | 1977 | 1978 |
| Owner-occupied | 62% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.