Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Anderson County, Kansas
EPA puts Anderson County in Zone 2, its middle radon zone, and only 12 radon tests from it are on file with CDC (2022). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
53.3%
21.5 pts above KS
- Anderson
- 53.3%
- Kansas
- 31.8%
45 tests, 2021
Median result
4.2pCi/L
Action level reached
- Anderson
- 4.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2021
Tests reported
45
51st of 62 by tests
- Anderson
- 45
- Johnson
- 25,860
Reported to CDC before any fix, 2021
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 Kansas
18 of 62
Middle half
- Anderson
- 53.3%
- Norton
- 93.8%
By share, of 62 with 30+ tests
Read a result for Anderson County
Starts at Anderson County's median, 4.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.2 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. Anderson County's median reported result, 2021.
The data
Anderson County, At a glance
Anderson County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Anderson 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 Anderson County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 73.3% |
| 2017 | 34.9% |
| 2018 | 13.3% |
| 2019 | 50.0% |
| 2020 | 33.3% |
| 2021 | 53.3% |
| 2022 | 41.7% |
2022: 41.7%. Across these years the share ran from 13.3% to 73.3%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 12 tests were reported to CDC for Anderson 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: 2016 to 2022 (every CDC figure on file).
Anderson County, Compared
Anderson County radon figures, compared
Calculated by Radon411More than half: 53.3% of the 45 radon tests reported to CDC for Anderson County in 2021 read at least 4 pCi/L. That places it 18th of 62 Kansas counties with 30 or more tests for the same period. That is 21.5 points above the 31.8% pooled from 96 Kansas counties.
The newest figure, in 2022, counts only 12 tests (41.7% at or above 4 pCi/L), too few to compare, so this reading uses the 45-test figure.
The median result, 4.2 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 21.3 pCi/L. The rest split 33.3% under 2 pCi/L and 13.3% from 2 to 4 (Kansas: 45.3% and 22.9%). The reported tests do not follow EPA's Zone 2 label for Anderson County (predicted average between 2 and 4 pCi/L): 53.3% of them reached 4 pCi/L, fewer than that label suggests.
No bordering county with a figure for the same period reported a higher share; the closest is Miami County at 34.3%, the lowest Linn County at 26.7%. Statewide for the same period, Norton County reported the highest share (93.8%) and Doniphan County the lowest (0.0%).
The busiest year on file was 2021, with 45 tests reported; the quietest, 2022, had 12.
Nationally, every county with a figure for the same period pools to 24.4%; Anderson County sits 28.9 points above it.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Anderson County, Geology
The ground under Anderson County
PredictedUSGS's geologic map puts all of Anderson County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Glaciated Area, to which USGS gives a radon index of 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Glaciated Area | Glacial till underlain by Pennsylvanian and Permian marine and nonmarine sedimentary shale, sandstone, limestone, coal. | Moderate | 9 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Anderson County beside the ground around it
Across Kansas 59.9% of the land is rated high; none of Anderson County's is. Of the 7 counties that border it, 1 has more high-potential ground, Miami County the most at 31.4%.
The map rates the ground, not the air in any home.
Local help
Anderson County, Local resources
Radon testing and mitigation in Anderson County
- Kansas Radon ProgramKansas Radon Program answers questions about testing, mitigation and the rules in Kansas.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Kansas178 professionals are listed in Kansas.
What Kansas's program says
- Phone
- (800) 693-5343
What it means
Anderson County, Questions
Questions about radon in Anderson County
Are radon levels high in Anderson County?
In 2022, 41.7% of the radon tests reported to CDC for Anderson County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.6 pCi/L. Of 62 Kansas counties with 30 or more tests for the same period, 17 reported a higher share; pooled, the state comes to 31.8%.
Which counties border Anderson County?
Anderson County borders 7 counties: Allen County, Coffey County, Linn County, Franklin County, Bourbon County, Woodson County and Miami County.
Products
Anderson County, Products
Testing a home in Anderson County
In Anderson County, 53.3% of 45 tests reported to CDC in 2021 reached 4 pCi/L, against 31.8% pooled across Kansas. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Anderson County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
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
MonitorSafetySiren
Pro4 plug-in radon detector with a display and alarm
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 48 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Anderson County, Bordering counties
Counties bordering Anderson County
Calculated by Radon411- Radon levels in Bourbon CountyEPA zone 2
44.4%at or above 4 pCi/L
Median 3.3 pCi/L · 27 tests · 8.9 points below Anderson County
- Radon levels in Miami CountyEPA zone 2
34.3%at or above 4 pCi/L
Median 2.2 pCi/L · 753 tests · 19.0 points below Anderson County
- Radon levels in Franklin CountyEPA zone 2
34.0%at or above 4 pCi/L
Median 2.3 pCi/L · 300 tests · 19.3 points below Anderson County
- Radon levels in Linn CountyEPA zone 2
26.7%at or above 4 pCi/L
Median 1.8 pCi/L · 45 tests · 26.6 points below Anderson County
- Radon levels in Allen CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 2.1 pCi/L · 6 tests · 53.3 points below Anderson County
- Radon levels in Coffey CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 1.8 pCi/L · 9 tests · 53.3 points below Anderson County
- Radon levels in Woodson CountyEPA zone 2
No CDC figure for 2021; its page reads it against its own neighbours.
Anderson County, Cities and towns
Cities and towns in Anderson County
The Census Bureau estimates 8,018 residents in Anderson County for July 1, 2025, 177 more than in 2020 (+2.3%). That works out to 14 people per square mile of land. Its largest town, Garnett, has 3,242 residents, 40.4% of the total. Together its 6 incorporated places hold 52.1% of those residents; the other 47.9% live outside any of them. Reported testing is thin here: 45 tests over 2021, or 5.6 for every 1,000 residents (2025 estimate), where Kansas as a whole comes to 23.5.
From Garnett to Lone Elm, CDC publishes no figure by town: each reads Anderson County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Garnett | 3,242 | Level | 40.4% |
| Colony | 387 | +1.3% | 4.8% |
| Greeley | 281 | +3.7% | 3.5% |
| Westphalia | 135 | +4.7% | 1.7% |
| Kincaid | 109 | +2.8% | 1.4% |
| Lone Elm | 22 | Level | 0.3% |
6 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).
Anderson County, Homes
Homes in Anderson County
Anderson County is a place of houses on their own lots: 89% of its 3,569 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1962 (1975 for Kansas), and 48% date from before 1960. Owners live in 81% of the occupied homes (Kansas: 67%), so for most households a test and a fix are their own to order.
| Homes | Anderson County | Kansas |
|---|---|---|
| Housing units | 3,569 | 1,285,221 |
| Detached houses | 89% | 72% |
| In buildings of 5 or more | 2% | 13% |
| Mobile homes | 6% | 4% |
| Built before 1960 | 48% | 33% |
| Built since 2000 | 9% | 20% |
| Middle year built | 1962 | 1975 |
| Owner-occupied | 81% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.