Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Linn County, Kansas
EPA puts Linn County in Zone 2, its middle radon zone, and only 15 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
26.7%
5.1 pts below KS
- Linn
- 26.7%
- Kansas
- 31.8%
45 tests, 2021
Median result
1.8pCi/L
Below action level
- Linn
- 1.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2021
Tests reported
45
52nd of 62 by tests
- Linn
- 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
50 of 62
Lowest quarter
- Linn
- 26.7%
- Norton
- 93.8%
By share, of 62 with 30+ tests
Read a result for Linn County
Starts at Linn County's median, 1.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.8 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Linn County's median reported result, 2021.
The data
Linn County, At a glance
Linn County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Linn 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 Linn County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 33.3% |
| 2017 | 54.5% |
| 2018 | 33.3% |
| 2019 | 21.4% |
| 2020 | 42.1% |
| 2021 | 26.7% |
| 2022 | 53.3% |
2022: 53.3%. Across these years the share ran from 21.4% to 54.5%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 15 tests were reported to CDC for Linn 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).
Linn County, Compared
Linn County radon figures, compared
Calculated by Radon411Linn County's 45 reported tests in 2021 had a middle value of 1.8 pCi/L and a maximum of 30.1 pCi/L, and 26.7% reached 4 pCi/L. Kansas as a whole (96 Kansas counties, pooled) comes to 31.8%: 5.1 points higher than here.
The newest figure, in 2022, counts only 15 tests (53.3% at or above 4 pCi/L), too few to compare, so this reading uses the 45-test figure.
Among its state's counties it ranks 50th of 62 Kansas counties with 30 or more tests for the same period. Statewide for the same period, Norton County reported the highest share (93.8%) and Doniphan County the lowest (0.0%).
Below the action level, 24 tests (53.3%) came in under 2 pCi/L, against 45.3% statewide, and 9 tests (20.0%) fell between 2 and 4, against 22.9% statewide. The busiest year on file was 2021, with 45 tests reported; the quietest, 2016, had 9.
EPA's 1993 zone map puts Linn County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Next door, the shares run from 34.0% in Franklin County to 53.3% in Anderson County.
CDC also counts 6 tests taken after mitigation in Linn 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.
Linn County, Geology
The ground under Linn County
PredictedUSGS's geologic map puts all of Linn 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 | 99.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Linn County beside the ground around it
Across Kansas 59.9% of the land is rated high; none of Linn County's is. Of the 7 counties that border it, 2 have more high-potential ground, Miami County the most at 31.4%.
The map rates the ground, not the air in any home.
Local help
Linn County, Local resources
Radon testing and mitigation in Linn 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
Linn County, Questions
Questions about radon in Linn County
Are radon levels high in Linn County?
In 2022, 53.3% of the radon tests reported to CDC for Linn County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.0 pCi/L. Of 62 Kansas counties with 30 or more tests for the same period, 49 reported a higher share; pooled, the state comes to 31.8%.
Which counties border Linn County?
Linn County borders 7 counties: Bourbon County, KS, Anderson County, KS, Bates County, MO, Miami County, KS, Allen County, KS, Vernon County, MO and Franklin County, KS.
Products
Linn County, Products
Testing a home in Linn County
In Linn County, 26.7% 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 Linn 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
MonitorAranet
Radon One battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Linn County, Bordering counties
Counties bordering Linn County
Calculated by Radon411- Radon levels in Anderson County, KSEPA zone 2
53.3%at or above 4 pCi/L
Median 4.2 pCi/L · 45 tests · 26.6 points above Linn County
- Radon levels in Bourbon County, KSEPA zone 2
44.4%at or above 4 pCi/L
Median 3.3 pCi/L · 27 tests · 17.7 points above Linn County
- Radon levels in Miami County, KSEPA zone 2
34.3%at or above 4 pCi/L
Median 2.2 pCi/L · 753 tests · 7.6 points above Linn County
- Radon levels in Franklin County, KSEPA zone 2
34.0%at or above 4 pCi/L
Median 2.3 pCi/L · 300 tests · 7.3 points above Linn County
- Radon levels in Bates County, MOEPA zone 2
0.0%at or above 4 pCi/L
Median 2.0 pCi/L · 2 tests · 26.7 points below Linn County
- Radon levels in Allen County, KSEPA zone 2
0.0%at or above 4 pCi/L
Median 2.1 pCi/L · 6 tests · 26.7 points below Linn County
- Radon levels in Vernon County, MOEPA zone 2
No CDC figure for 2021; its page reads it against its own neighbours.
Linn County, Cities and towns
Cities and towns in Linn County
The Census Bureau estimates 9,950 residents in Linn County for July 1, 2025, 355 more than in 2020 (+3.7%). That works out to 17 people per square mile of land. No town dominates: Pleasanton, the largest, has 1,186 residents, 11.9% of the total. Together its 7 incorporated places hold 46.9% of those residents; the other 53.1% live outside any of them. Reported testing is thin here: 45 tests over 2021, or 4.5 for every 1,000 residents (2025 estimate), where Kansas as a whole comes to 23.5.
From Pleasanton to Prescott, CDC publishes no figure by town: each reads Linn County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Pleasanton | 1,186 | −2.2% | 11.9% |
| Linn Valley | 1,162 | +21.0% | 11.7% |
| La Cygne | 1,013 | −2.9% | 10.2% |
| Mound City | 639 | −1.8% | 6.4% |
| Parker | 232 | −3.3% | 2.3% |
| Blue Mound | 220 | −0.9% | 2.2% |
| Prescott | 216 | +3.8% | 2.2% |
7 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).
Linn County, Homes
Homes in Linn County
Linn County is a place of houses on their own lots: 81% of its 5,180 homes are detached single-family houses, against 72% across Kansas. Half of its homes were built before 1981, close to Kansas' 1975: 26% date from before 1960 and 24% from 2000 or later. Owners live in 80% of the occupied homes (Kansas: 67%), so for most households a test and a fix are their own to order.
| Homes | Linn County | Kansas |
|---|---|---|
| Housing units | 5,180 | 1,285,221 |
| Detached houses | 81% | 72% |
| In buildings of 5 or more | 3% | 13% |
| Mobile homes | 13% | 4% |
| Built before 1960 | 26% | 33% |
| Built since 2000 | 24% | 20% |
| Middle year built | 1981 | 1975 |
| Owner-occupied | 80% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.