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 Appanoose County, Iowa
EPA puts Appanoose County in Zone 1, its highest radon zone, and high results are common there: 45.3% of the 117 radon tests reported to CDC (2008 to 2017, laboratory totals) came back at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
45.3%
13.2 pts below IA
- Appanoose
- 45.3%
- Iowa
- 58.5%
117 tests, 2008 to 2017
Median result
3.7pCi/L
Below action level
- Appanoose
- 3.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
117
89th of 99 by tests
- Appanoose
- 117
- Polk
- 10,945
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 Iowa
86 of 99
Lowest quarter
- Appanoose
- 45.3%
- Sioux
- 84.2%
By share, of 99 with 30+ tests
Read a result for Appanoose County
Starts at Appanoose County's median, 3.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.7 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. Appanoose County's median reported result, 2008 to 2017.
The data
Appanoose County, At a glance
Appanoose County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Appanoose County in
USGS geologic potential: High across 54% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Appanoose County, 2008 to 2017, laboratory
Under 2 pCi/L: 30%2 to 4 pCi/L: 25%4 pCi/L and above: 45%
Of 117 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 35 | 29.9% |
| 2 to 4 pCi/L | 29 | 24.8% |
| 4 pCi/L and above | 53 | 45.3% |
What these figures count
These are the 117 tests reported to CDC for Appanoose County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Appanoose County, Compared
Appanoose County radon figures, compared
Calculated by Radon411In Appanoose County, about 5 in 10 reported tests over the 2008 to 2017 laboratory totals (53 of 117) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 9.6 points higher. Across 99 Iowa counties pooled together, 58.5% of tests reached that level, so Appanoose County runs 13.2 points below its state.
Of 5 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 33.9% (Monroe County) to 42.4% (Davis County). By share, Appanoose County is 86th of 99 Iowa counties with 30 or more tests for the same period.
Half the tests came in under 3.7 pCi/L and half over it; the single highest reached 16.5 pCi/L. Below the action level, 35 tests (29.9%) came in under 2 pCi/L, against 21.8% statewide, and 29 tests (24.8%) fell between 2 and 4, against 19.7% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 45.3% share point the same way here. USGS geology rates 54% of the county's land high radon potential. CDC also counts 7 tests taken after mitigation in Appanoose County for the same period: tests in homes where a fix was already in.
CDC's ten-year totals for Appanoose County went from 145 tests (2005 to 2014) to 117 (2008 to 2017), the share going from 38.6% to 45.3%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Appanoose County, Geology
The ground under Appanoose County
PredictedUSGS's geologic map splits Appanoose County: 53.5% of its land is high radon potential and 46.5% moderate. The map puts 53.5% of Appanoose County in the area it calls Loess-Covered Drift Plains and 46.5% 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 |
|---|---|---|---|---|
| Loess-Covered Drift Plains | Pre-Illinoian and Illinoian glacial deposits, and loess. | High | 13 | 53.5% |
| Dissected Till Plains | Till-covered Pennsylvanian sandstone, shale, and limestone. | Moderate | 11 | 46.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Appanoose County beside the ground around it
Iowa as a whole has more high-potential ground than Appanoose County: 98.8% of its land, against 53.5% here. Of the 7 counties that border it, 5 have more high-potential ground, Lucas County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Appanoose County, Local resources
Radon testing and mitigation in Appanoose County
Listed radon businesses with an address in Appanoose County:
- Iowa HHS Radon ProgramIowa HHS Radon Program, run by Iowa Department of Health and Human Services, licenses or certifies radon professionals, offers free or discounted test kits and states the rule for disclosing radon when a home is sold, and answers questions about testing and mitigation in Iowa.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
You can reach the Hotline by calling 1-800-383-5992 to order low-cost radon test kits and find answers to your radon questions.
- Compare kits
- Professionals in Iowa185 professionals are listed in Iowa.
Listed radon professionals by town: Centerville
What Iowa's program says
- Phone
- (515) 281-4928
- Licensing of radon professionals
Iowa’s radon program approves applications for persons who wish to become certified to perform radon testing or credentialed to perform mitigation and laboratories that provide radon testing devices and analytical services.
- Disclosure when a home is sold or rented
However, per Iowa Code chapters 543B.9 and 543B.18 and Iowa Administrative Code 193E Chapter 14 administered by the Iowa Real Estate Commission, a seller must disclose any known tests for the presence of radon and if yes, provide the date of last report and the result(s).
What it means
Appanoose County, Questions
Questions about radon in Appanoose County
Are radon levels high in Appanoose County?
Over the 2008 to 2017 laboratory totals, 45.3% of the radon tests reported to CDC for Appanoose County, Iowa were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.7 pCi/L. Of 99 Iowa counties with 30 or more tests for the same period, 85 reported a higher share; pooled, the state comes to 58.5%.
Which counties border Appanoose County?
Appanoose County borders 7 counties: Monroe County, IA, Putnam County, MO, Wayne County, IA, Davis County, IA, Schuyler County, MO, Lucas County, IA and Wapello County, IA.
Products
Appanoose County, Products
Testing a home in Appanoose County
In Appanoose County, 45.3% of 117 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 58.5% pooled across Iowa. In Zone 1 the year-round level in Appanoose 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
MonitorAEGTEST
HOUND-1011 rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Appanoose County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Appanoose County
Explore
Appanoose County, Bordering counties
Counties bordering Appanoose County
Calculated by Radon411- Radon levels in Davis County, IAEPA zone 1
42.4%at or above 4 pCi/L
Median 3.1 pCi/L · 85 tests · 2.9 points below Appanoose County
- Radon levels in Lucas County, IAEPA zone 1
39.3%at or above 4 pCi/L
Median 3.3 pCi/L · 84 tests · 6.0 points below Appanoose County
- Radon levels in Wapello County, IAEPA zone 1
35.9%at or above 4 pCi/L
Median 2.7 pCi/L · 287 tests · 9.4 points below Appanoose County
- Radon levels in Wayne County, IAEPA zone 1
34.8%at or above 4 pCi/L
Median 3.0 pCi/L · 46 tests · 10.5 points below Appanoose County
- Radon levels in Monroe County, IAEPA zone 1
33.9%at or above 4 pCi/L
Median 2.9 pCi/L · 59 tests · 11.4 points below Appanoose County
- Radon levels in Putnam County, MOEPA zone 2
33.3%at or above 4 pCi/L
Median 1.8 pCi/L · 9 tests · 12.0 points below Appanoose County
- Radon levels in Schuyler County, MOEPA zone 2
9.1%at or above 4 pCi/L
Median 1.0 pCi/L · 11 tests · 36.2 points below Appanoose County
Appanoose County, Cities and towns
Cities and towns in Appanoose County
About 12,077 people live in Appanoose County by the Census Bureau's estimate for July 1, 2025, 206 fewer than in 2020 (−1.7%). That works out to 24 people per square mile of land. Its largest town, Centerville, has 5,327 residents, 44.1% of the total. Reported testing is thin here: 117 tests over 2008 to 2017, or 9.7 for every 1,000 residents (2025 estimate), where Iowa as a whole comes to 29.4.
From Centerville to Udell, CDC publishes no figure by town: each reads Appanoose County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Centerville | 5,327 | −1.5% | 44.1% |
| Moraviaextends beyond Appanoose County | 626 | −1.9% | Counted whole |
| Moulton | 595 | −1.8% | 4.9% |
| Mystic | 316 | −1.9% | 2.6% |
| Cincinnati | 282 | −1.7% | 2.3% |
| Exline | 154 | −3.1% | 1.3% |
| Unionville | 74 | −2.6% | 0.6% |
| Numa | 71 | −1.4% | 0.6% |
| Plano | 57 | −1.7% | 0.5% |
| Rathbun | 40 | −2.4% | 0.3% |
| Udell | 31 | −3.1% | 0.3% |
11 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 Appanoose County is counted whole, so it has no share.
Appanoose County, Homes
Homes in Appanoose County
Appanoose County is a place of houses on their own lots: 77% of its 6,314 homes are detached single-family houses, against 72% across Iowa. Half of its homes were built before 1964, close to Iowa's 1971: 46% date from before 1960 and 13% from 2000 or later. 69% of occupied homes are lived in by their owner (Iowa: 72%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Appanoose County | Iowa |
|---|---|---|
| Housing units | 6,314 | 1,427,175 |
| Detached houses | 77% | 72% |
| In buildings of 5 or more | 9% | 14% |
| Mobile homes | 7% | 3% |
| Built before 1960 | 46% | 39% |
| Built since 2000 | 13% | 21% |
| Middle year built | 1964 | 1971 |
| Owner-occupied | 69% | 72% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.