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 Cheyenne County, Kansas
EPA puts Cheyenne County in Zone 1, its highest radon zone, and only 7 radon tests from it are on file with CDC (2020). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
58.7%
Sherman County
- Sherman
- 58.7%
1 of 5 neighbours have 30+ tests, 2019
Nearest county
58.7%
Sherman County, 30 miles
- Sherman
- 58.7%
- Kansas
- 33.7%
Share at 4+ pCi/L, 63 tests, 2019
Ground above low
100.0%
Level with Kansas
- Cheyenne
- 100.0%
- Kansas
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
12
Too few for a share
- Cheyenne
- 12
- Needed
- 30
2019
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Read a result for Cheyenne County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 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.
The data
Cheyenne County, At a glance
Cheyenne County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Cheyenne County in
USGS geologic potential: High across 96% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Cheyenne County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 20.0% |
| 2017 | 14.3% |
| 2018 | 85.7% |
| 2019 | 25.0% |
| 2020 | 28.6% |
2020: 28.6%. Across these years the share ran from 14.3% to 85.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 7 tests were reported to CDC for Cheyenne County over 2020, 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: 2020. Measured data period: 2016 to 2020 (every CDC figure on file).
Cheyenne County, Compared
Cheyenne County radon figures, compared
Calculated by Radon411CDC's largest figure for Cheyenne County rests on 12 tests in 2019, 3 of them at or above 4 pCi/L, so each test moves its share by 8.3 points and no rank or comparison is drawn from it. Results reached as high as 7.7 pCi/L, with a middle value of 2.5 pCi/L.
Sherman County, the one bordering county with a figure in 2019, reported 58.7% of its tests at or above 4 pCi/L. Farther out, Thomas County (47 miles away) at 45.5%, Scott County (100 miles away) at 61.5% and Phillips County (127 miles away) at 71.4% have figures too. Pooled across 102 Kansas counties, 33.7% of reported tests reached that level; across every county in the country with a figure, 29.0%.
Statewide for the same period, Jewell County reported the highest share (71.9%) and Reno County the lowest (20.8%). EPA's 1993 map puts Cheyenne County in Zone 1, the map's highest label: a predicted county average above 4 pCi/L. USGS geology rates 96% of the county's land high radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Cheyenne County, Geology
The ground under Cheyenne County
PredictedMost of the ground under Cheyenne County is one class on USGS's geologic map: 96.4% of its land is high radon potential, with 3.6% moderate. 96.4% of it lies in the area the map calls Ogallala Formation, 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 |
|---|---|---|---|---|
| Ogallala Formation | Tertiary sandstone, in part covered by windblown eolian sand and loess deposits. | High | 12 | 96.4% |
| Tertiary Rocks | Tertiary sandstone, siltstone, and volcanic ash. | Moderate | 11 | 3.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Cheyenne County beside the ground around it
Cheyenne County has more high-potential ground than Kansas as a whole: 96.4% of its land against 59.9%. Of the 5 counties that border it, 3 have more high-potential ground, Kit Carson County, CO the most at 100%.
The map rates the ground, not the air in any home.
Local help
Cheyenne County, Local resources
Radon testing and mitigation in Cheyenne 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
Cheyenne County, Questions
Questions about radon in Cheyenne County
Are radon levels high in Cheyenne County?
In 2020, 28.6% of the radon tests reported to CDC for Cheyenne County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Sherman County, the one bordering county with a figure in 2019, reported 58.7% of its tests at or above 4 pCi/L.
Which counties border Cheyenne County?
Cheyenne County borders 5 counties: Sherman County, KS, Dundy County, NE, Rawlins County, KS, Yuma County, CO and Kit Carson County, CO.
Products
Cheyenne County, Products
Testing a home in Cheyenne County
No CDC figure names Cheyenne County; the nearest county with one, Sherman County (30 miles away), reported 58.7% of its tests at or above 4 pCi/L in 2019, the only reading nearby until a test of this home. In Zone 1 the year-round level in Cheyenne 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 monitorMonitorSafetySiren
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
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
Cheyenne County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Cheyenne County
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Cheyenne County, Bordering counties
Counties bordering Cheyenne County
Calculated by Radon411- Radon levels in Kit Carson County, COEPA zone 1
84.6%at or above 4 pCi/L
Median 7.0 pCi/L · 13 tests
- Radon levels in Sherman County, KSEPA zone 1
58.7%at or above 4 pCi/L
Median 4.6 pCi/L · 63 tests
- Radon levels in Yuma County, COEPA zone 1
46.2%at or above 4 pCi/L
Median 3.5 pCi/L · 13 tests
- Radon levels in Rawlins County, KSEPA zone 1
25.0%at or above 4 pCi/L
Median 3.5 pCi/L · 4 tests
- Radon levels in Dundy County, NEEPA zone 2
12.5%at or above 4 pCi/L
Median 1.4 pCi/L · 24 tests
Cheyenne County, Cities and towns
Cities and towns in Cheyenne County
Cheyenne County's population has barely moved since 2020: 2,604 residents on July 1, 2025 against 2,613 then, by the Census Bureau's estimates. Spread over its land, that is 2.6 people to the square mile. Its largest town, St. Francis, has 1,265 residents, 48.6% of the total. Together its 2 incorporated places hold 65.4% of those residents; the other 34.6% live outside any of them. Reported testing is thin here: 12 tests over 2019, or 4.6 for every 1,000 residents (2025 estimate), where Kansas as a whole comes to 8.1.
From St. Francis to Bird City, CDC publishes no figure by town: each reads Cheyenne County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| St. Francis | 1,265 | −0.4% | 48.6% |
| Bird City | 439 | +0.5% | 16.9% |
2 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).
Cheyenne County, Homes
Homes in Cheyenne County
Cheyenne County is a place of houses on their own lots: 91% of its 1,465 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1949 (1975 for Kansas), and 62% date from before 1960. 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 | Cheyenne County | Kansas |
|---|---|---|
| Housing units | 1,465 | 1,285,221 |
| Detached houses | 91% | 72% |
| In buildings of 5 or more | 2% | 13% |
| Mobile homes | 3% | 4% |
| Built before 1960 | 62% | 33% |
| Built since 2000 | 5% | 20% |
| Middle year built | 1949 | 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.