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 Andrew County, Missouri
EPA puts Andrew County in Zone 1, its highest radon zone, and only 5 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
60.8%
30.2 pts above MO
- Andrew
- 60.8%
- Missouri
- 30.6%
158 tests, 2008 to 2017
Median result
4.9pCi/L
Action level reached
- Andrew
- 4.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
158
27th of 72 by tests
- Andrew
- 158
- 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
2 of 72
Top quarter
- Andrew
- 60.8%
- Atchison
- 69.9%
By share, of 72 with 30+ tests
Read a result for Andrew County
Starts at Andrew County's median, 4.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.9 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. Andrew County's median reported result, 2008 to 2017.
The data
Andrew County, At a glance
Andrew County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Andrew County in
USGS geologic potential: High across 91% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Andrew County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 57.5% |
| 2015 | 20.0% |
| 2016 | 50.0% |
| 2017 | 50.0% |
| 2018 | 50.0% |
| 2019 | 66.7% |
| 2020 | 0.0% |
| 2021 | 33.3% |
| 2022 | 66.7% |
| 2023 | 40.0% |
2023: 40.0%. Across these years the share ran from 0.0% to 66.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 5 tests were reported to CDC for Andrew 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).
Andrew County, Compared
Andrew County radon figures, compared
Calculated by Radon411More than half: 60.8% of the 158 radon tests reported to CDC for Andrew County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 2nd of 72 Missouri counties with 30 or more tests for the same period. That is 30.2 points above the 30.6% pooled from 115 Missouri counties.
The newest figure, in 2023, counts only 5 tests (40.0% at or above 4 pCi/L), too few to compare, so this reading uses the 158-test figure.
The median result, 4.9 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 80.1 pCi/L. The rest split 17.1% under 2 pCi/L and 22.2% from 2 to 4 (Missouri: 41.2% and 28.1%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 60.8% share point the same way here.
No bordering county with a figure for the same period reported a higher share; the closest is Buchanan County at 52.9%, the lowest DeKalb County at 24.2%. Statewide for the same period, Atchison County reported the highest share (69.9%) and Vernon County the lowest (8.8%).
The busiest year on file was 2014, with 40 tests reported; the quietest, 2018, had 2.
Nationally, every county with a figure for the same period pools to 35.7%; Andrew County sits 25.1 points above it. CDC also counts 11 tests taken after mitigation in Andrew 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.
Andrew County, Geology
The ground under Andrew County
PredictedMost of the ground under Andrew County is one class on USGS's geologic map: 91.5% of its land is high radon potential, with 8.5% moderate. The map puts 91.3% of Andrew County in the area it calls Northwestern Dissected Till Plains and 8.5% 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 | 91.3% |
| Dissected Till Plains | Till-covered Pennsylvanian sandstone, shale, and limestone. | Moderate | 11 | 8.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Andrew County beside the ground around it
Andrew County has more high-potential ground than Missouri as a whole: 91.5% of its land against 8.2%. Of the 6 counties that border it, 3 have more high-potential ground, Buchanan County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Andrew County, Local resources
Radon testing and mitigation in Andrew 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
Andrew County, Questions
Questions about radon in Andrew County
Are radon levels high in Andrew County?
In 2023, 40.0% of the radon tests reported to CDC for Andrew County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.7 pCi/L. Of 72 Missouri counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 30.6%.
Which counties border Andrew County?
Andrew County borders 6 counties: Doniphan County, KS, DeKalb County, MO, Buchanan County, MO, Holt County, MO, Nodaway County, MO and Gentry County, MO.
Products
Andrew County, Products
Testing a home in Andrew County
In Andrew County, 60.8% of 158 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 Andrew 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
MonitorX-Sense
XR0A-SR battery digital radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Andrew County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Andrew County
Explore
Andrew County, Bordering counties
Counties bordering Andrew County
Calculated by Radon411- Radon levels in Holt County, MOEPA zone 1
62.1%at or above 4 pCi/L
Median 4.9 pCi/L · 29 tests · 1.3 points above Andrew County
- Radon levels in Buchanan County, MOEPA zone 1
52.9%at or above 4 pCi/L
Median 4.2 pCi/L · 575 tests · 7.9 points below Andrew County
- Radon levels in Gentry County, MOEPA zone 2
41.7%at or above 4 pCi/L
Median 3.5 pCi/L · 24 tests · 19.1 points below Andrew County
- Radon levels in Nodaway County, MOEPA zone 1
34.2%at or above 4 pCi/L
Median 2.7 pCi/L · 225 tests · 26.6 points below Andrew County
- Radon levels in DeKalb County, MOEPA zone 2
24.2%at or above 4 pCi/L
Median 2.3 pCi/L · 33 tests · 36.6 points below Andrew County
- Radon levels in Doniphan County, KSEPA zone 2
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Andrew County, Cities and towns
Cities and towns in Andrew County
The Census Bureau estimates 18,241 residents in Andrew County for July 1, 2025, 132 more than in 2020 (+0.7%). That works out to 42 people per square mile of land. Its largest town, Savannah, has 5,107 residents, 28.0% of the total. Together its 8 incorporated places hold 46.5% of those residents; the other 53.5% live outside any of them. CDC's 158 reported tests for 2008 to 2017 work out to 8.7 per 1,000 residents (2025 estimate), close to Missouri's 9.3.
From Savannah to Rea, CDC publishes no figure by town: each reads Andrew County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Savannah | 5,107 | +1.2% | 28.0% |
| Country Club | 2,512 | +0.5% | 13.8% |
| Amazonia | 244 | +0.8% | 1.3% |
| Fillmore | 180 | Level | 1.0% |
| Bolckow | 164 | +0.6% | 0.9% |
| Rosendale | 124 | +0.8% | 0.7% |
| Cosby | 114 | Level | 0.6% |
| Rea | 45 | 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).
Andrew County, Homes
Homes in Andrew County
Andrew County is a place of houses on their own lots: 82% of its 7,551 homes are detached single-family houses, against 70% across Missouri. Half of its homes were built before 1979, close to Missouri's 1978: 26% date from before 1960 and 19% from 2000 or later. Owners live in 77% of the occupied homes (Missouri: 68%), so for most households a test and a fix are their own to order.
| Homes | Andrew County | Missouri |
|---|---|---|
| Housing units | 7,551 | 2,809,501 |
| Detached houses | 82% | 70% |
| In buildings of 5 or more | 4% | 13% |
| Mobile homes | 7% | 5% |
| Built before 1960 | 26% | 28% |
| Built since 2000 | 19% | 21% |
| Middle year built | 1979 | 1978 |
| Owner-occupied | 77% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.