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 Huerfano County, Colorado
EPA puts Huerfano County in Zone 1, its highest radon zone, and 28.3% of its 53 reported radon tests (2023) were 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
28.3%
10.6 pts below CO
- Huerfano
- 28.3%
- Colorado
- 38.9%
53 tests, 2023
Median result
1.3pCi/L
Below action level
- Huerfano
- 1.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
53
33rd of 38 by tests
- Huerfano
- 53
- Jefferson
- 3,068
Reported to CDC before any fix, 2023
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
34 of 38
Lowest quarter
- Huerfano
- 28.3%
- Park
- 57.5%
By share, of 38 with 30+ tests
Read a result for Huerfano County
Starts at Huerfano County's median, 1.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.3 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. Huerfano County's median reported result, 2023.
The data
Huerfano County, At a glance
Huerfano County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Huerfano County in
USGS geologic potential: High across 88% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Huerfano County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 52.9% |
| 2015 | 60.0% |
| 2016 | 0.0% |
| 2017 | 12.5% |
| 2018 | 30.8% |
| 2019 | 32.7% |
| 2020 | 32.5% |
| 2021 | 40.0% |
| 2022 | 41.7% |
| 2023 | 28.3% |
2023: 28.3%. Across these years the share ran from 0.0% to 60.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 53 tests reported to CDC for Huerfano County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Huerfano County, Compared
Huerfano County radon figures, compared
Calculated by Radon411Huerfano County's 53 reported tests in 2023 had a middle value of 1.3 pCi/L and a maximum of 18.6 pCi/L, and 28.3% reached 4 pCi/L. Colorado as a whole (61 Colorado counties, pooled) comes to 38.9%: 10.6 points higher than here.
Among its state's counties it ranks 34th of 38 Colorado counties with 30 or more tests for the same period. Statewide for the same period, Park County reported the highest share (57.5%) and Bent County the lowest (3.7%).
Below the action level, 35 tests (66.0%) came in under 2 pCi/L, against 39.2% statewide, and 3 tests (5.7%) fell between 2 and 4, against 22.0% statewide. The busiest year on file was 2023, with 53 tests reported; the quietest, 2015, had 5.
EPA's 1993 zone map puts Huerfano County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 88% of the county's land high radon potential.
Next door, the shares run from 19.4% in Las Animas County to 45.7% in Custer County, with Las Animas County below Huerfano County. Over 6 years of annual figures the share fell 2.5 points, from 30.8% in 2018 to 28.3% in 2023; its peak was 41.7% in 2022.
CDC also counts 5 tests taken after mitigation in Huerfano County for the same period: tests in homes where a fix was already in.
Huerfano CountyColorado, pooled
28.3% % of tests38.9% % of tests
| Year | Tests | Huerfano County, at or above 4 pCi/L | Colorado, pooled |
|---|---|---|---|
| 2018 | 39 | 30.8% | 44.2% |
| 2019 | 52 | 32.7% | 44.1% |
| 2020 | 40 | 32.5% | 41.9% |
| 2021 | 50 | 40.0% | 47.3% |
| 2022 | 48 | 41.7% | 38.6% |
| 2023 | 53 | 28.3% | 38.9% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Huerfano County, State data
Colorado's own radon test data
MeasuredWhat Colorado's own agencies publish about radon tests in Huerfano 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 Huerfano 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
29.5%
212 of 719 tests
Median result
2.0 pCi/L
Highest result
113.7 pCi/L
Tests behind these figures
719 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.
Huerfano County, Geology
The ground under Huerfano County
PredictedMost of the ground under Huerfano County is one class on USGS's geologic map: 87.7% of its land is high radon potential, with 12.3% moderate. The map puts 49.4% of Huerfano County in the area it calls Rocky Mountains and 38.3% in High Plains, with one smaller area beside them. USGS gives the first a radon index of 15 and the second 12, both in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Rocky Mountains | Precambrian granites, gneiss, amphibolite, variable uranium content, abundant shear zones.Sedimentary rocks shed from the granitic highlands. | High | 15 | 49.4% |
| High Plains | Quaternary deposits and Cretaceous marine shales that locally have a high radiometric signature. | High | 12 | 38.3% |
| Southern Great Plains | Cretaceous sedimentary rocks including sandstone and shale. | Moderate | 10 | 12.3% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Huerfano County beside the ground around it
Huerfano County has more high-potential ground than Colorado as a whole: 87.7% of its land against 74.8%. Of the 6 counties that border it, 2 have more high-potential ground, Pueblo County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Huerfano County, Local resources
Radon testing and mitigation in Huerfano 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
Huerfano County, Questions
Questions about radon in Huerfano County
Are radon levels high in Huerfano County?
In 2023, 28.3% of the radon tests reported to CDC for Huerfano County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.3 pCi/L. Of 38 Colorado counties with 30 or more tests for the same period, 33 reported a higher share; pooled, the state comes to 38.9%.
Which counties border Huerfano County?
Huerfano County borders 6 counties: Pueblo County, Costilla County, Custer County, Alamosa County, Las Animas County and Saguache County.
Products
Huerfano County, Products
Testing a home in Huerfano County
In Huerfano County, 28.3% of 53 tests reported to CDC in 2023 reached 4 pCi/L, against 38.9% pooled across Colorado. In Zone 1 the year-round level in Huerfano 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
lüft plug-in radon and indoor air quality monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi, Bluetooth
- App only
First reading: Within 90 minutes
Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Huerfano County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Huerfano County
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Huerfano County, Bordering counties
Counties bordering Huerfano County
Calculated by Radon411- Radon levels in Custer CountyEPA zone 1
45.7%at or above 4 pCi/L
Median 3.5 pCi/L · 35 tests · 17.4 points above Huerfano County
- Radon levels in Pueblo CountyEPA zone 1
44.4%at or above 4 pCi/L
Median 3.5 pCi/L · 342 tests · 16.1 points above Huerfano County
- Radon levels in Saguache CountyEPA zone 2
41.7%at or above 4 pCi/L
Median 3.1 pCi/L · 12 tests · 13.4 points above Huerfano County
- Radon levels in Alamosa CountyEPA zone 2
25.0%at or above 4 pCi/L
Median 0.6 pCi/L · 12 tests · 3.3 points below Huerfano County
- Radon levels in Las Animas CountyEPA zone 1
19.4%at or above 4 pCi/L
Median 1.1 pCi/L · 93 tests · 8.9 points below Huerfano County
- Radon levels in Costilla CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 0.5 pCi/L · 2 tests · 28.3 points below Huerfano County
Huerfano County, Cities and towns
Cities and towns in Huerfano County
The Census Bureau estimates 7,011 residents in Huerfano County for July 1, 2025, 187 more than in 2020 (+2.7%). Spread over its land, that is 4.4 people to the square mile. Its largest town, Walsenburg, has 3,039 residents, 43.3% of the total. Together its 2 incorporated places hold 55.6% of those residents; the other 44.4% live outside any of them. Testing is reported here more often than across the state: CDC's 53 reported tests for 2023 come to 7.6 for every 1,000 residents (2025 estimate), against 3.6 for Colorado.
From Walsenburg to La Veta, CDC publishes no figure by town: each reads Huerfano County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Walsenburg | 3,039 | −0.4% | 43.3% |
| La Veta | 859 | +0.5% | 12.3% |
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).
Huerfano County, Homes
Homes in Huerfano County
Huerfano County is a place of houses on their own lots: 81% of its 4,750 homes are detached single-family houses, against 62% across Colorado. The homes are older than Colorado's as a whole: half were built before 1976 (1987 for Colorado), and 33% date from before 1960. Owners live in 77% of the occupied homes (Colorado: 66%), so for most households a test and a fix are their own to order.
| Homes | Huerfano County | Colorado |
|---|---|---|
| Housing units | 4,750 | 2,545,124 |
| Detached houses | 81% | 62% |
| In buildings of 5 or more | 3% | 22% |
| Mobile homes | 11% | 4% |
| Built before 1960 | 33% | 16% |
| Built since 2000 | 14% | 31% |
| Middle year built | 1976 | 1987 |
| Owner-occupied | 77% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.