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, Colorado
EPA puts Cheyenne County in Zone 1, its highest radon zone, and only 1 radon test from it is on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
71.4%
Kit Carson County
- Kit Carson
- 71.4%
1 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
71.4%
Kit Carson County, 33 miles
- Kit Carson
- 71.4%
- Colorado
- 47.0%
Share at 4+ pCi/L, 42 tests, 2008 to 2017
Ground above low
100.0%
Level with Colorado
- Cheyenne
- 100.0%
- Colorado
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
6
Too few for a share
- Cheyenne
- 6
- Needed
- 30
2008 to 2017, laboratory
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 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Cheyenne County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2015 | 50.0% |
| 2019 | 0.0% |
| 2021 | 100.0% |
| 2023 | 0.0% |
2023: 0.0%. Across these years the share ran from 0.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 1 test was reported to CDC for Cheyenne County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Cheyenne County, Compared
Cheyenne County radon figures, compared
Calculated by Radon411CDC's largest figure for Cheyenne County rests on 6 tests over the 2008 to 2017 laboratory totals, 4 of them at or above 4 pCi/L, so each test moves its share by 16.7 points and no rank or comparison is drawn from it. Results reached as high as 14.3 pCi/L, with a middle value of 4.9 pCi/L.
Kit Carson County, the one bordering county with a figure over the 2008 to 2017 laboratory totals, reported 71.4% of its tests at or above 4 pCi/L. Farther out, Prowers County (61 miles away) at 31.4%, Bent County (65 miles away) at 59.4% and Yuma County (82 miles away) at 57.1% have figures too. Pooled across 63 Colorado counties, 47.0% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Kit Carson County reported the highest share (71.4%) and Alamosa County the lowest (26.6%). 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 100% of the county's land high radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Cheyenne County, State data
Colorado's own radon test data
MeasuredWhat Colorado's own agencies publish about radon tests in Cheyenne County, with their period. These are not CDC's figures and are never added to them.
MeasuredState figures, not CDC's
What Colorado CDPHE reports for Cheyenne County
Radon data (county results): radon test results received from radon testing labs, primarily short-term household tests taken by the homeowner. Period: 2005-2025.
Share over 4 pCi/L
57.1%
4 of 7 tests
Median result
6.1 pCi/L
Highest result
14.3 pCi/L
Tests behind these figures
7 tests
Publisher's note: CDPHE flags this county as having fewer than 10 tests..
- CDPHE says these data do not give actual radon levels in homes that have not been tested.
- When possible, only tests conducted before a mitigation system was installed are used.
- Some counties have very small numbers of test results, and their summaries may be less representative.
- These figures describe tests reported to Colorado CDPHE in this area. They count a different set of tests than CDC's figures and are not a reading of any one home.
Measured: Colorado CDPHE data, 2005-2025.
Cheyenne County, Geology
The ground under Cheyenne County
PredictedUSGS's geologic map puts all of Cheyenne County's mapped land in one class: high radon potential. The map puts 51.4% of Cheyenne County in the area it calls High Plains and 48.6% in Ogallala Formation. USGS gives both 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 |
|---|---|---|---|---|
| High Plains | Quaternary deposits and Cretaceous marine shales that locally have a high radiometric signature. | High | 12 | 51.4% |
| Ogallala Formation | Tertiary sandstone, in part covered by windblown eolian sand and loess deposits. | High | 12 | 48.6% |
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 Colorado as a whole: 100% of its land against 74.8%. Of the 5 counties that border it, none has as large a share of high-potential ground; Greeley County, KS comes nearest 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
- Colorado's radon programColorado Department of Public Health and EnvironmentColorado's radon program 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 Colorado.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Order a discounted radon test kit
- Compare kits
- Professionals in Colorado25 professionals are listed in Colorado.
What Colorado's program says
- Licensing of radon professionals
Listed contractors are certified by the National Radon Proficiency Program or the National Radon Safety Board, and must be licensed by the Colorado Department of Regulatory Agencies.
- Disclosure when a home is sold or rented
As of August 7, 2023, landlords in Colorado are required to disclose radon information when a tenant signs a lease agreement.
What it means
Cheyenne County, Questions
Questions about radon in Cheyenne County
Are radon levels high in Cheyenne County?
In 2023, 0.0% of the radon tests reported to CDC for Cheyenne County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.9 pCi/L. Kit Carson County, the one bordering county with a figure over the 2008 to 2017 laboratory totals, reported 71.4% of its tests at or above 4 pCi/L.
Which counties border Cheyenne County?
Cheyenne County borders 5 counties: Kiowa County, CO, Kit Carson County, CO, Wallace County, KS, Lincoln County, CO and Greeley County, KS.
Products
Cheyenne County, Products
Testing a home in Cheyenne County
No CDC figure names Cheyenne County; the nearest county with one, Kit Carson County (33 miles away), reported 71.4% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, 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
Explore
Cheyenne County, Bordering counties
Counties bordering Cheyenne County
Calculated by Radon411- Radon levels in Kit Carson County, COEPA zone 1
71.4%at or above 4 pCi/L
Median 5.3 pCi/L · 42 tests
- Radon levels in Kiowa County, COEPA zone 1
63.6%at or above 4 pCi/L
Median 5.8 pCi/L · 11 tests
- Radon levels in Lincoln County, COEPA zone 1
50.0%at or above 4 pCi/L
Median 4.0 pCi/L · 16 tests
- Radon levels in Wallace County, KSEPA zone 1
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
- Radon levels in Greeley County, KSEPA zone 1
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Cheyenne County, Cities and towns
Cities and towns in Cheyenne County
About 1,713 people live in Cheyenne County by the Census Bureau's estimate for July 1, 2025, 33 fewer than in 2020 (−1.9%). Spread over its land, that is 1.0 people to the square mile. Its largest town, Cheyenne Wells, has 722 residents, 42.1% of the total. Together its 2 incorporated places hold 56.7% of those residents; the other 43.3% live outside any of them. Reported testing is thin here: 6 tests over 2008 to 2017, or 3.5 for every 1,000 residents (2025 estimate), where Colorado as a whole comes to 16.0.
From Cheyenne Wells to Kit Carson, CDC publishes no figure by town: each reads Cheyenne County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Cheyenne Wells | 722 | −4.4% | 42.1% |
| Kit Carson | 250 | −3.8% | 14.6% |
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: 87% of its 965 homes are detached single-family houses, against 62% across Colorado. The homes are older than Colorado's as a whole: half were built before 1969 (1987 for Colorado), and 39% date from before 1960. 73% of occupied homes are lived in by their owner (Colorado: 66%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Cheyenne County | Colorado |
|---|---|---|
| Housing units | 965 | 2,545,124 |
| Detached houses | 87% | 62% |
| In buildings of 5 or more | 0% | 22% |
| Mobile homes | 10% | 4% |
| Built before 1960 | 39% | 16% |
| Built since 2000 | 9% | 31% |
| Middle year built | 1969 | 1987 |
| Owner-occupied | 73% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.