Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Routt County, Colorado
EPA puts Routt County in Zone 2, its middle radon zone, and high results are common there: 44.4% of the 178 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
44.4%
5.5 pts above CO
- Routt
- 44.4%
- Colorado
- 38.9%
178 tests, 2023
Median result
3.3pCi/L
Below action level
- Routt
- 3.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
178
18th of 38 by tests
- Routt
- 178
- 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
15 of 38
Middle half
- Routt
- 44.4%
- Park
- 57.5%
By share, of 38 with 30+ tests
Read a result for Routt County
Starts at Routt County's median, 3.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.3 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. Routt County's median reported result, 2023.
The data
Routt County, At a glance
Routt County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Routt County is a
USGS geologic potential: Moderate across 65% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Routt County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 43.0% |
| 2015 | 52.9% |
| 2016 | 35.3% |
| 2017 | 29.6% |
| 2018 | 47.1% |
| 2019 | 45.4% |
| 2020 | 53.8% |
| 2021 | 52.4% |
| 2022 | 31.9% |
| 2023 | 44.4% |
2023: 44.4%. Across these years the share ran from 29.6% to 53.8%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 178 tests reported to CDC for Routt 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).
Routt County, Compared
Routt County radon figures, compared
Calculated by Radon411In Routt County, about 4 in 10 reported tests in 2023 (79 of 178) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 11.0 points higher. Across 61 Colorado counties pooled together, 38.9% of tests reached that level, so Routt County runs 5.5 points above its state.
Of 3 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 39.3% (Garfield County) to 45.8% (Eagle County). By share, Routt County is 15th of 38 Colorado counties with 30 or more tests for the same period.
Year by year, 2014 opened at 43.0% and 2023 closed at 44.4% (about level), with 2020 the high at 53.8%. Half the tests came in under 3.3 pCi/L and half over it; the single highest reached 42.3 pCi/L. Below the action level, 57 tests (32.0%) came in under 2 pCi/L, against 39.2% statewide, and 42 tests (23.6%) 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 44.4% share point the same way here. USGS geology rates 65% of the county's land moderate radon potential. CDC also counts 16 tests taken after mitigation in Routt County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2019, with 361 tests reported; the quietest, 2017, had 142.
Routt CountyColorado, pooled
| Year | Tests | Routt County, at or above 4 pCi/L | Colorado, pooled |
|---|---|---|---|
| 2014 | 142 | 43.0% | 46.5% |
| 2015 | 155 | 52.9% | 47.2% |
| 2016 | 170 | 35.3% | 38.5% |
| 2017 | 142 | 29.6% | 41.0% |
| 2018 | 221 | 47.1% | 44.2% |
| 2019 | 361 | 45.4% | 44.1% |
| 2020 | 143 | 53.8% | 41.9% |
| 2021 | 187 | 52.4% | 47.3% |
| 2022 | 191 | 31.9% | 38.6% |
| 2023 | 178 | 44.4% | 38.9% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Routt County, State data
Colorado's own radon test data
MeasuredWhat Colorado's own agencies publish about radon tests in Routt 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 Routt 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
51.7%
1,423 of 2,753 tests
Median result
4.2 pCi/L
Highest result
276.0 pCi/L
Tests behind these figures
2,753 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.
Routt County, Geology
The ground under Routt County
PredictedUSGS's geologic map splits Routt County: 65.3% of its land is moderate radon potential and 34.7% high. The map puts 65.3% of Routt County in the area it calls Western Slope and 33.0% in Rocky Mountains, with one smaller area beside them. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 15, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Western Slope | Paleozoic and Mesozoic sandstone, siltstone, shale, basalt. | Moderate | 11 | 65.3% |
| Rocky Mountains | Precambrian granites, gneiss, amphibolite, variable uranium content, abundant shear zones.Sedimentary rocks shed from the granitic highlands. | High | 15 | 33.0% |
| Paradox Basin | Tertiary sandstone, siltstone and shale. | High | 13 | 1.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Routt County beside the ground around it
Colorado as a whole has more high-potential ground than Routt County: 74.8% of its land, against 34.7% here. Of the 7 counties that border it, 6 have more high-potential ground, Jackson County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Routt County, Local resources
Radon testing and mitigation in Routt 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
Routt County, Questions
Questions about radon in Routt County
Are radon levels high in Routt County?
In 2023, 44.4% of the radon tests reported to CDC for Routt County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of 38 Colorado counties with 30 or more tests for the same period, 14 reported a higher share; pooled, the state comes to 38.9%.
Which counties border Routt County?
Routt County borders 7 counties: Jackson County, CO, Grand County, CO, Garfield County, CO, Moffat County, CO, Eagle County, CO, Rio Blanco County, CO and Carbon County, WY.
Products
Routt County, Products
Testing a home in Routt County
In Routt County, 44.4% of 178 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 Routt County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
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
Monitor
RadonPro Wi-Fi radon monitor with a built-in Geiger counter
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Routt County, Bordering counties
Counties bordering Routt County
Calculated by Radon411- Radon levels in Jackson County, COEPA zone 1
50.0%at or above 4 pCi/L
Median 3.3 pCi/L · 14 tests · 5.6 points above Routt County
- Radon levels in Eagle County, COEPA zone 2
45.8%at or above 4 pCi/L
Median 3.5 pCi/L · 312 tests · 1.4 points above Routt County
- Radon levels in Grand County, COEPA zone 1
44.1%at or above 4 pCi/L
Median 3.3 pCi/L · 136 tests · 0.3 points below Routt County
- Radon levels in Garfield County, COEPA zone 1
39.3%at or above 4 pCi/L
Median 2.9 pCi/L · 224 tests · 5.1 points below Routt County
- Radon levels in Moffat County, COEPA zone 1
30.8%at or above 4 pCi/L
Median 2.4 pCi/L · 13 tests · 13.6 points below Routt County
- Radon levels in Rio Blanco County, COEPA zone 1
20.0%at or above 4 pCi/L
Median 1.9 pCi/L · 15 tests · 24.4 points below Routt County
- Radon levels in Carbon County, WYEPA zone 1
No CDC figure for 2023; its page reads it against its own neighbours.
Routt County, Cities and towns
Cities and towns in Routt County
The Census Bureau estimates 25,329 residents in Routt County for July 1, 2025, 492 more than in 2020 (+2.0%). That works out to 11 people per square mile of land. Steamboat Springs alone is home to 13,557 of them, 53.5% of the total. Together its 4 incorporated places hold 67.2% of those residents; the other 32.8% live outside any of them. Testing is reported here more often than across the state: CDC's 178 reported tests for 2023 come to 7.0 for every 1,000 residents (2025 estimate), against 3.6 for Colorado.
From Steamboat Springs to Yampa, CDC publishes no figure by town: each reads Routt County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Steamboat Springs | 13,557 | +2.5% | 53.5% |
| Hayden | 2,250 | +16.5% | 8.9% |
| Oak Creek | 834 | −6.2% | 3.3% |
| Yampa | 373 | −5.3% | 1.5% |
4 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).
Routt County, Homes
Homes in Routt County
Fewer than six in ten of Routt County's 16,913 homes are detached houses (51%, against 62% across Colorado); the rest are attached, in shared buildings or mobile. Half of its homes were built before 1992, close to Colorado's 1987: 8% date from before 1960 and 33% from 2000 or later. Owners live in 76% of the occupied homes (Colorado: 66%), so for most households a test and a fix are their own to order.
| Homes | Routt County | Colorado |
|---|---|---|
| Housing units | 16,913 | 2,545,124 |
| Detached houses | 51% | 62% |
| In buildings of 5 or more | 26% | 22% |
| Mobile homes | 5% | 4% |
| Built before 1960 | 8% | 16% |
| Built since 2000 | 33% | 31% |
| Middle year built | 1992 | 1987 |
| Owner-occupied | 76% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.