Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Yuma County, Colorado
EPA puts Yuma County in Zone 1, its highest radon zone, and only 2 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
57.1%
10.1 pts above CO
- Yuma
- 57.1%
- Colorado
- 47.0%
35 tests, 2008 to 2017
Median result
4.0pCi/L
Action level reached
- Yuma
- 4.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
35
48th of 50 by tests
- Yuma
- 35
- Jefferson
- 11,723
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Colorado
18 of 50
Middle half
- Yuma
- 57.1%
- Kit Carson
- 71.4%
By share, of 50 with 30+ tests
Read a result for Yuma County
Starts at Yuma County's median, 4.0 pCi/L
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. Yuma County's median reported result, 2008 to 2017.
The data
Yuma County, At a glance
Yuma County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Yuma County in
USGS geologic potential: High across 51% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Yuma County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 100.0% |
| 2015 | 0.0% |
| 2016 | 100.0% |
| 2017 | 33.3% |
| 2018 | 60.0% |
| 2019 | 46.2% |
| 2020 | 50.0% |
| 2021 | 55.6% |
| 2022 | 50.0% |
| 2023 | 50.0% |
2023: 50.0%. 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 2 tests were reported to CDC for Yuma 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).
Yuma County, Compared
Yuma County radon figures, compared
Calculated by Radon411More than half: 57.1% of the 35 radon tests reported to CDC for Yuma County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 18th of 50 Colorado counties with 30 or more tests for the same period. That is 10.1 points above the 47.0% pooled from 63 Colorado counties.
The newest figure, in 2023, counts only 2 tests (50.0% at or above 4 pCi/L), too few to compare, so this reading uses the 35-test figure.
The median result, 4.0 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 11.5 pCi/L. The rest split 2.9% under 2 pCi/L and 40.0% from 2 to 4 (Colorado: 31.4% and 21.5%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 57.1% share point the same way here.
4 of its 5 bordering counties with figures ran higher, led by Kit Carson County at 71.4%; Phillips County reported 40.7%. Statewide for the same period, Kit Carson County reported the highest share (71.4%) and Alamosa County the lowest (26.6%).
The busiest year on file was 2018, with 15 tests reported; the quietest, 2015, had 1.
Nationally, every county with a figure for the same period pools to 35.7%; Yuma County sits 21.4 points above it.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Yuma County, State data
Colorado's own radon test data
MeasuredWhat Colorado's own agencies publish about radon tests in Yuma 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 Yuma 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
56%
56 of 100 tests
Median result
4.3 pCi/L
Highest result
160.5 pCi/L
Tests behind these figures
100 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.
Yuma County, Geology
The ground under Yuma County
PredictedUSGS's geologic map splits Yuma County: 50.8% of its land is high radon potential and 49.2% moderate. The map puts 50.8% of Yuma County in the area it calls Ogallala Formation and 49.2% in Tertiary Rocks. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).
| 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 | 50.8% |
| Tertiary Rocks | Tertiary sandstone, siltstone, and volcanic ash. | Moderate | 11 | 49.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Yuma County beside the ground around it
Colorado as a whole has more high-potential ground than Yuma County: 74.8% of its land, against 50.8% here. Of the 7 counties that border it, 5 have more high-potential ground, Kit Carson County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Yuma County, Local resources
Radon testing and mitigation in Yuma 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
Yuma County, Questions
Questions about radon in Yuma County
Are radon levels high in Yuma County?
In 2023, 50.0% of the radon tests reported to CDC for Yuma County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.0 pCi/L. Of 50 Colorado counties with 30 or more tests for the same period, 17 reported a higher share; pooled, the state comes to 47.0%.
Which counties border Yuma County?
Yuma County borders 7 counties: Phillips County, CO, Dundy County, NE, Washington County, CO, Cheyenne County, KS, Chase County, NE, Kit Carson County, CO and Logan County, CO.
Products
Yuma County, Products
Testing a home in Yuma County
In Yuma County, 57.1% of 35 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 47.0% pooled across Colorado. In Zone 1 the year-round level in Yuma 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
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
Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Yuma County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Yuma County
Explore
Yuma County, Bordering counties
Counties bordering Yuma 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 · 14.3 points above Yuma County
- Radon levels in Chase County, NEEPA zone 2
68.2%at or above 4 pCi/L
Median 6.5 pCi/L · 44 tests · 11.1 points above Yuma County
- Radon levels in Washington County, COEPA zone 1
62.8%at or above 4 pCi/L
Median 4.6 pCi/L · 86 tests · 5.7 points above Yuma County
- Radon levels in Logan County, COEPA zone 1
58.8%at or above 4 pCi/L
Median 4.8 pCi/L · 80 tests · 1.7 points above Yuma County
- Radon levels in Dundy County, NEEPA zone 2
57.1%at or above 4 pCi/L
Median 4.1 pCi/L · 21 tests · 0.0 points above Yuma County
- Radon levels in Phillips County, COEPA zone 1
40.7%at or above 4 pCi/L
Median 3.5 pCi/L · 54 tests · 16.4 points below Yuma County
- Radon levels in Cheyenne County, KSEPA zone 1
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Yuma County, Cities and towns
Cities and towns in Yuma County
About 9,896 people live in Yuma County by the Census Bureau's estimate for July 1, 2025, 79 fewer than in 2020 (−0.8%). Spread over its land, that is 4.2 people to the square mile. Its largest town, Yuma, has 3,424 residents, 34.6% of the total. Together its 3 incorporated places hold 60.7% of those residents; the other 39.3% live outside any of them. Reported testing is thin here: 35 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 Yuma to Eckley, CDC publishes no figure by town: each reads Yuma County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Yuma | 3,424 | −1.3% | 34.6% |
| Wray | 2,352 | +1.1% | 23.8% |
| Eckley | 232 | Level | 2.3% |
3 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).
Yuma County, Homes
Homes in Yuma County
Yuma County is a place of houses on their own lots: 79% of its 4,324 homes are detached single-family houses, against 62% across Colorado. The homes are older than Colorado's as a whole: half were built before 1967 (1987 for Colorado), and 45% date from before 1960. 70% 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 | Yuma County | Colorado |
|---|---|---|
| Housing units | 4,324 | 2,545,124 |
| Detached houses | 79% | 62% |
| In buildings of 5 or more | 4% | 22% |
| Mobile homes | 11% | 4% |
| Built before 1960 | 45% | 16% |
| Built since 2000 | 14% | 31% |
| Middle year built | 1967 | 1987 |
| Owner-occupied | 70% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.