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 Cloud County, Kansas
EPA puts Cloud County in Zone 1, its highest radon zone, and high results are common there: 54.6% of the 97 radon tests reported to CDC (2022) 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
54.6%
22.6 pts above KS
- Cloud
- 54.6%
- Kansas
- 32.0%
97 tests, 2022
Median result
4.3pCi/L
Action level reached
- Cloud
- 4.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2022
Tests reported
97
20th of 38 by tests
- Cloud
- 97
- Johnson
- 5,240
Reported to CDC before any fix, 2022
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Kansas
3 of 38
Top quarter
- Cloud
- 54.6%
- Mitchell
- 57.4%
By share, of 38 with 30+ tests
Read a result for Cloud County
Starts at Cloud County's median, 4.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.3 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. Cloud County's median reported result, 2022.
The data
Cloud County, At a glance
Cloud County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Cloud County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Cloud County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 59.3% |
| 2017 | 57.8% |
| 2018 | 50.5% |
| 2019 | 52.4% |
| 2020 | 63.0% |
| 2021 | 60.2% |
| 2022 | 54.6% |
2022: 54.6%. Across these years the share ran from 50.5% to 63.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 97 tests reported to CDC for Cloud County over 2022, 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: 2022. Measured data period: 2016 to 2022 (every CDC figure on file).
Cloud County, Compared
Cloud County radon figures, compared
Calculated by Radon411More than half: 54.6% of the 97 radon tests reported to CDC for Cloud County in 2022 read at least 4 pCi/L. That places it 3rd of 38 Kansas counties with 30 or more tests for the same period. That is 22.6 points above the 32.0% pooled from 96 Kansas counties.
The median result, 4.3 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 22.3 pCi/L. The rest split 18.6% under 2 pCi/L and 26.8% from 2 to 4 (Kansas: 45.8% and 22.1%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 54.6% share point the same way here.
2 of its 3 bordering counties with figures ran higher, led by Mitchell County at 57.4%; Republic County reported 52.9%. Statewide for the same period, Mitchell County reported the highest share (57.4%) and Crawford County the lowest (5.9%).
The busiest year on file was 2021, with 264 tests reported; the quietest, 2016, had 54.
Over 7 years of annual figures the share fell 4.7 points, from 59.3% in 2016 to 54.6% in 2022; its peak was 63.0% in 2020. Nationally, every county with a figure for the same period pools to 23.9%; Cloud County sits 30.7 points above it. CDC also counts 22 tests taken after mitigation in Cloud County for the same period: tests in homes where a fix was already in.
Cloud CountyKansas, pooled
54.6% % of tests32.0% % of tests
| Year | Tests | Cloud County, at or above 4 pCi/L | Kansas, pooled |
|---|---|---|---|
| 2016 | 54 | 59.3% | 35.4% |
| 2017 | 90 | 57.8% | 37.3% |
| 2018 | 111 | 50.5% | 37.3% |
| 2019 | 63 | 52.4% | 33.7% |
| 2020 | 73 | 63.0% | 31.3% |
| 2021 | 264 | 60.2% | 31.8% |
| 2022 | 97 | 54.6% | 32.0% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Cloud County, Geology
The ground under Cloud County
PredictedUSGS's geologic map puts all of Cloud County's mapped land in one class: high radon potential. All of it lies in the area the map calls Smoky Hills, to which USGS gives a radon index of 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Smoky Hills | Cretaceous marine sandstone, shale, and siltstone covered by discontinuous loess deposits. | High | 12 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Cloud County beside the ground around it
Cloud County has more high-potential ground than Kansas as a whole: 100% of its land against 59.9%. Of the 6 counties that border it, none has as large a share of high-potential ground; Jewell County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Cloud County, Local resources
Radon testing and mitigation in Cloud 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
Cloud County, Questions
Questions about radon in Cloud County
Are radon levels high in Cloud County?
In 2022, 54.6% of the radon tests reported to CDC for Cloud County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.3 pCi/L. Of 38 Kansas counties with 30 or more tests for the same period, 2 reported a higher share; pooled, the state comes to 32.0%.
Which counties border Cloud County?
Cloud County borders 6 counties: Ottawa County, Clay County, Republic County, Mitchell County, Washington County and Jewell County.
Products
Cloud County, Products
Testing a home in Cloud County
In Cloud County, 54.6% of 97 tests reported to CDC in 2022 reached 4 pCi/L, against 32.0% pooled across Kansas. In Zone 1 the year-round level in Cloud 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
View Radon Wi-Fi radon monitor with an e-paper display
- C-NRPP 2024/25: Approved
- Battery
- Wi-Fi, Bluetooth
- Screen, app
Method: Alpha spectrometry
Readings: Every 60 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
Cloud County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Cloud County
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Cloud County, Bordering counties
Counties bordering Cloud County
Calculated by Radon411- Radon levels in Jewell CountyEPA zone 1
58.3%at or above 4 pCi/L
Median 9.3 pCi/L · 12 tests · 3.7 points above Cloud County
- Radon levels in Mitchell CountyEPA zone 1
57.4%at or above 4 pCi/L
Median 6.2 pCi/L · 47 tests · 2.8 points above Cloud County
- Radon levels in Clay CountyEPA zone 1
55.8%at or above 4 pCi/L
Median 4.8 pCi/L · 77 tests · 1.2 points above Cloud County
- Radon levels in Republic CountyEPA zone 1
52.9%at or above 4 pCi/L
Median 4.3 pCi/L · 34 tests · 1.7 points below Cloud County
- Radon levels in Washington CountyEPA zone 1
43.8%at or above 4 pCi/L
Median 3.3 pCi/L · 16 tests · 10.8 points below Cloud County
- Radon levels in Ottawa CountyEPA zone 1
32.0%at or above 4 pCi/L
Median 3.3 pCi/L · 25 tests · 22.6 points below Cloud County
Cloud County, Cities and towns
Cities and towns in Cloud County
About 8,833 people live in Cloud County by the Census Bureau's estimate for July 1, 2025, 177 fewer than in 2020 (−2.0%). That works out to 12 people per square mile of land. Concordia alone is home to 4,991 of them, 56.5% of the total. Testing is reported here more often than across the state: CDC's 97 reported tests for 2022 come to 11.0 for every 1,000 residents (2025 estimate), against 6.2 for Kansas.
From Concordia to Aurora, CDC publishes no figure by town: each reads Cloud County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Concordia | 4,991 | −1.9% | 56.5% |
| Clyde | 675 | −2.0% | 7.6% |
| Glasco | 438 | −2.2% | 5.0% |
| Miltonvale | 437 | −1.8% | 4.9% |
| Jamestown | 235 | −2.1% | 2.7% |
| Simpsonextends beyond Cloud County | 81 | −3.6% | Counted whole |
| Aurora | 53 | −1.9% | 0.6% |
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). A place that extends beyond Cloud County is counted whole, so it has no share.
Cloud County, Homes
Homes in Cloud County
Cloud County is a place of houses on their own lots: 88% of its 4,490 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1953 (1975 for Kansas), and 59% date from before 1960. 75% of occupied homes are lived in by their owner (Kansas: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Cloud County | Kansas |
|---|---|---|
| Housing units | 4,490 | 1,285,221 |
| Detached houses | 88% | 72% |
| In buildings of 5 or more | 5% | 13% |
| Mobile homes | 1% | 4% |
| Built before 1960 | 59% | 33% |
| Built since 2000 | 7% | 20% |
| Middle year built | 1953 | 1975 |
| Owner-occupied | 75% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.