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
Locations and reports
Radon Levels in Archuleta County, Colorado
EPA puts Archuleta County in Zone 2, its middle radon zone, and high results are common there: 40.2% of the 92 radon tests reported to CDC (2023) 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
40.2%
1.3 pts above CO
- Archuleta
- 40.2%
- Colorado
- 38.9%
92 tests, 2023
Median result
2.3pCi/L
Below action level
- Archuleta
- 2.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
92
30th of 38 by tests
- Archuleta
- 92
- Jefferson
- 3,068
Reported to CDC before any fix, 2023
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Colorado
19 of 38
Middle half
- Archuleta
- 40.2%
- Park
- 57.5%
By share, of 38 with 30+ tests
Read a result for Archuleta County
Starts at Archuleta County's median, 2.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.3 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Archuleta County's median reported result, 2023.
The data
Archuleta County, At a glance
Archuleta County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Archuleta County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Archuleta County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 34.0% |
| 2015 | 40.8% |
| 2016 | 28.3% |
| 2017 | 33.0% |
| 2018 | 34.5% |
| 2019 | 37.0% |
| 2020 | 55.4% |
| 2021 | 46.2% |
| 2022 | 25.9% |
| 2023 | 40.2% |
2023: 40.2%. Across these years the share ran from 25.9% to 55.4%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 92 tests reported to CDC for Archuleta 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).
Archuleta County, Compared
Archuleta County radon figures, compared
Calculated by Radon411In Archuleta County, about 4 in 10 reported tests in 2023 (37 of 92) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 6.8 points higher. Across 61 Colorado counties pooled together, 38.9% of tests reached that level, so Archuleta County runs 1.3 points above its state.
La Plata County, the one bordering county with a figure for the same period, reported 39.3%. By share, Archuleta County is 19th of 38 Colorado counties with 30 or more tests for the same period.
Year by year, 2014 opened at 34.0% and 2023 closed at 40.2% (up 6.2 points), with 2020 the high at 55.4%. Half the tests came in under 2.3 pCi/L and half over it; the single highest reached 17.9 pCi/L. Below the action level, 42 tests (45.7%) came in under 2 pCi/L, against 39.2% statewide, and 13 tests (14.1%) fell between 2 and 4, against 22.0% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 40.2% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential.
The busiest year on file was 2018, with 267 tests reported; the quietest, 2014, had 47.
Archuleta CountyColorado, pooled
| Year | Tests | Archuleta County, at or above 4 pCi/L | Colorado, pooled |
|---|---|---|---|
| 2014 | 47 | 34.0% | 46.5% |
| 2015 | 71 | 40.8% | 47.2% |
| 2016 | 92 | 28.3% | 38.5% |
| 2017 | 88 | 33.0% | 41.0% |
| 2018 | 267 | 34.5% | 44.2% |
| 2019 | 108 | 37.0% | 44.1% |
| 2020 | 92 | 55.4% | 41.9% |
| 2021 | 52 | 46.2% | 47.3% |
| 2022 | 58 | 25.9% | 38.6% |
| 2023 | 92 | 40.2% | 38.9% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Archuleta County, State data
Colorado's own radon test data
MeasuredWhat Colorado's own agencies publish about radon tests in Archuleta 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 Archuleta 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
33.3%
343 of 1,030 tests
Median result
2.5 pCi/L
Highest result
209.0 pCi/L
Tests behind these figures
1,030 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.
Archuleta County, Geology
The ground under Archuleta County
PredictedUSGS's geologic map puts all of Archuleta County's mapped land in one class: moderate radon potential. The map puts 77.8% of Archuleta County in the area it calls San Juan Basin and 22.2% in San Juan Volcanic field. USGS gives both a radon index of 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| San Juan Basin | Mesozoic marine and non-marine sedimentary rocks including sandstone, siltstone, shale, minor limestone. | Moderate | 11 | 77.8% |
| San Juan Volcanic field | Volcanic rocks, rhyolite, tuff, basalt | Moderate | 11 | 22.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Archuleta County beside the ground around it
Across Colorado 74.8% of the land is rated high; none of Archuleta County's is. Of the 7 counties that border it, 4 have more high-potential ground, Rio Arriba County, NM the most at 37.9%.
The map rates the ground, not the air in any home.
Local help
Archuleta County, Local resources
Radon testing and mitigation in Archuleta 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
Archuleta County, Questions
Questions about radon in Archuleta County
Are radon levels high in Archuleta County?
In 2023, 40.2% of the radon tests reported to CDC for Archuleta County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.3 pCi/L. Of 38 Colorado counties with 30 or more tests for the same period, 18 reported a higher share; pooled, the state comes to 38.9%.
Which counties border Archuleta County?
Archuleta County borders 7 counties: Mineral County, CO, Hinsdale County, CO, Rio Grande County, CO, La Plata County, CO, Conejos County, CO, Rio Arriba County, NM and San Juan County, NM.
Products
Archuleta County, Products
Testing a home in Archuleta County
In Archuleta County, 40.2% of 92 tests reported to CDC in 2023 reached 4 pCi/L, against 38.9% pooled across Colorado. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Archuleta County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorX-Sense
XR0B-SR battery digital radon monitor with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Archuleta County, Bordering counties
Counties bordering Archuleta County
Calculated by Radon411- Radon levels in Hinsdale County, COEPA zone 2
100.0%at or above 4 pCi/L
Median 6.8 pCi/L · 1 test · 59.8 points above Archuleta County
- Radon levels in Conejos County, COEPA zone 2
100.0%at or above 4 pCi/L
Median 10.2 pCi/L · 4 tests · 59.8 points above Archuleta County
- Radon levels in Mineral County, COEPA zone 2
40.0%at or above 4 pCi/L
Median 1.0 pCi/L · 5 tests · 0.2 points below Archuleta County
- Radon levels in La Plata County, COEPA zone 1
39.3%at or above 4 pCi/L
Median 3.1 pCi/L · 224 tests · 0.9 points below Archuleta County
- Radon levels in Rio Grande County, COEPA zone 2
36.4%at or above 4 pCi/L
Median 3.7 pCi/L · 11 tests · 3.8 points below Archuleta County
- Radon levels in Rio Arriba County, NMEPA zone 1
No CDC figure for 2023; its page reads it against its own neighbours.
- Radon levels in San Juan County, NMEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
Archuleta County, Cities and towns
Cities and towns in Archuleta County
Archuleta County is growing: the Census Bureau puts it at 14,306 residents on July 1, 2025, up 6.6% from 13,426 in 2020. That works out to 11 people per square mile of land. Pagosa Springs, its one incorporated place, has 1,838 residents, 12.8% of the total. Testing is reported here more often than across the state: CDC's 92 reported tests for 2023 come to 6.4 for every 1,000 residents (2025 estimate), against 3.6 for Colorado.
Pagosa Springs is the one incorporated place here; CDC publishes no figure by town, so it reads Archuleta County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Pagosa Springs | 1,838 | +13.4% | 12.8% |
One incorporated place, 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).
Archuleta County, Homes
Homes in Archuleta County
Of Archuleta County's 9,710 homes, 75% are detached houses, against 62% across Colorado; 9% are mobile homes. Half of its homes were built before 1994, close to Colorado's 1987: 5% date from before 1960 and 36% from 2000 or later. 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 | Archuleta County | Colorado |
|---|---|---|
| Housing units | 9,710 | 2,545,124 |
| Detached houses | 75% | 62% |
| In buildings of 5 or more | 5% | 22% |
| Mobile homes | 9% | 4% |
| Built before 1960 | 5% | 16% |
| Built since 2000 | 36% | 31% |
| Middle year built | 1994 | 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.