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 Jackson County, Colorado
EPA puts Jackson County in Zone 1, its highest radon zone, and only 14 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
Highest bordering
57.9%
Larimer County
- Larimer
- 57.9%
- Albany
- 27.9%
5 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
49.3%
Routt County, 36 miles
- Routt
- 49.3%
- Colorado
- 47.0%
Share at 4+ pCi/L, 1,117 tests, 2008 to 2017
Ground above low
100.0%
Level with Colorado
- Jackson
- 100.0%
- Colorado
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
15
Too few for a share
- Jackson
- 15
- 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 Jackson 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
Jackson County, At a glance
Jackson County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Jackson 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 Jackson County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2015 | 50.0% |
| 2016 | 50.0% |
| 2017 | 100.0% |
| 2018 | 73.3% |
| 2019 | 93.3% |
| 2020 | 50.0% |
| 2023 | 50.0% |
2023: 50.0%. Across these years the share ran from 50.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 14 tests were reported to CDC for Jackson 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).
Jackson County, Compared
Jackson County radon figures, compared
Calculated by Radon411CDC's largest figure for Jackson County rests on 15 tests in 2019, 14 of them at or above 4 pCi/L, so each test moves its share by 6.7 points and no rank or comparison is drawn from it. Results reached as high as 17.9 pCi/L, with a middle value of 6.5 pCi/L.
Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Larimer County reported the largest share at or above 4 pCi/L, 57.9%, and Albany County, WY the smallest, 27.9%, with Routt County at 49.3%, Grand County at 47.4% and Carbon County, WY at 41.3% between. Farther out, Boulder County (65 miles away) at 44.8%, Gilpin County (71 miles away) at 64.6% and Summit County (72 miles away) at 58.7% 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 Jackson 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.
Jackson County, State data
Colorado's own radon test data
MeasuredWhat Colorado's own agencies publish about radon tests in Jackson 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 Jackson 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
60.9%
28 of 46 tests
Median result
5.0 pCi/L
Highest result
22.2 pCi/L
Tests behind these figures
46 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.
Jackson County, Geology
The ground under Jackson County
PredictedUSGS's geologic map puts all of Jackson County's mapped land in one class: high radon potential. All of it lies in the area the map calls Rocky Mountains, to which USGS gives a radon index of 15, 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Jackson County beside the ground around it
Jackson 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; Albany County, WY comes nearest at 99.7%.
The map rates the ground, not the air in any home.
Local help
Jackson County, Local resources
Radon testing and mitigation in Jackson 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
Jackson County, Questions
Questions about radon in Jackson County
Are radon levels high in Jackson County?
In 2023, 50.0% of the radon tests reported to CDC for Jackson County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Larimer County reported the largest share at or above 4 pCi/L, 57.9%, and Albany County, WY the smallest, 27.9%, with Routt County at 49.3%, Grand County at 47.4% and Carbon County, WY at 41.3% between.
Which counties border Jackson County?
Jackson County borders 5 counties: Routt County, CO, Grand County, CO, Larimer County, CO, Carbon County, WY and Albany County, WY.
Products
Jackson County, Products
Testing a home in Jackson County
No CDC figure names Jackson County; the nearest county with one, Routt County (36 miles away), reported 49.3% 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 Jackson 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
MonitorAEGTEST
HOUND-1085 palm-sized rechargeable radon detector
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 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
Jackson County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Jackson County
Explore
Jackson County, Bordering counties
Counties bordering Jackson County
Calculated by Radon411- Radon levels in Larimer County, COEPA zone 1
57.9%at or above 4 pCi/L
Median 5.0 pCi/L · 9,325 tests
- Radon levels in Routt County, COEPA zone 2
49.3%at or above 4 pCi/L
Median 3.9 pCi/L · 1,117 tests
- Radon levels in Grand County, COEPA zone 1
47.4%at or above 4 pCi/L
Median 3.8 pCi/L · 38 tests
- Radon levels in Carbon County, WYEPA zone 1
41.3%at or above 4 pCi/L
Median 3.0 pCi/L · 80 tests
- Radon levels in Albany County, WYEPA zone 1
27.9%at or above 4 pCi/L
Median 2.7 pCi/L · 394 tests
Jackson County, Cities and towns
Cities and towns in Jackson County
Jackson County has been losing residents: from 1,379 in 2020 to 1,211 on July 1, 2025, a fall of 12.2% by the Census Bureau's estimates. Spread over its land, that is 0.8 people to the square mile. Walden, its one incorporated place, has 529 residents, 43.7% of the total. Testing is reported here more often than across the state: CDC's 15 reported tests for 2019 come to 12.4 for every 1,000 residents (2025 estimate), against 5.6 for Colorado.
Walden is the one incorporated place here; CDC publishes no figure by town, so it reads Jackson County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Walden | 529 | −12.9% | 43.7% |
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).
Jackson County, Homes
Homes in Jackson County
Jackson County is a place of houses on their own lots: 81% of its 1,155 homes are detached single-family houses, against 62% across Colorado. The homes are older than Colorado's as a whole: half were built before 1977 (1987 for Colorado), and 35% 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 | Jackson County | Colorado |
|---|---|---|
| Housing units | 1,155 | 2,545,124 |
| Detached houses | 81% | 62% |
| In buildings of 5 or more | 1% | 22% |
| Mobile homes | 16% | 4% |
| Built before 1960 | 35% | 16% |
| Built since 2000 | 25% | 31% |
| Middle year built | 1977 | 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.