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 Moffat County, Colorado
EPA puts Moffat County in Zone 1, its highest radon zone, and only 13 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
55.0%
5.5 pts above CO
- Moffat
- 55.0%
- Colorado
- 49.5%
362 tests, 2005 to 2014
Median result
4.3pCi/L
Action level reached
- Moffat
- 4.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2005 to 2014
Tests reported
362
21st of 47 by tests
- Moffat
- 362
- Jefferson
- 8,109
Reported to CDC before any fix, 2005 to 2014
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 47
Middle half
- Moffat
- 55.0%
- Pueblo
- 69.9%
By share, of 47 with 30+ tests
Read a result for Moffat County
Starts at Moffat County's median, 4.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.3 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. Moffat County's median reported result, 2005 to 2014.
The data
Moffat County, At a glance
Moffat County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Moffat County in
USGS geologic potential: High across 61% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Moffat County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 57.1% |
| 2015 | 50.0% |
| 2016 | 30.8% |
| 2017 | 31.6% |
| 2018 | 26.1% |
| 2019 | 61.2% |
| 2020 | 29.2% |
| 2021 | 53.1% |
| 2022 | 50.0% |
| 2023 | 30.8% |
2023: 30.8%. Across these years the share ran from 26.1% to 61.2%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 13 tests were reported to CDC for Moffat 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).
Moffat County, Compared
Moffat County radon figures, compared
Calculated by Radon411More than half: 55.0% of the 362 radon tests reported to CDC for Moffat County over the 2005 to 2014 laboratory totals read at least 4 pCi/L. That places it 18th of 47 Colorado counties with 30 or more tests for the same period. That is 5.5 points above the 49.5% pooled from 63 Colorado counties.
The newest figure, in 2023, counts only 13 tests (30.8% at or above 4 pCi/L), too few to compare, so this reading uses the 362-test figure.
The median result, 4.3 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 100.9 pCi/L. The rest split 17.4% under 2 pCi/L and 27.6% from 2 to 4 (Colorado: 29.2% and 21.4%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 55.0% share point the same way here.
1 of its 4 bordering counties with figures ran higher, led by Uintah County, UT at 65.3%; Carbon County, WY reported 32.3%. Statewide for the same period, Pueblo County reported the highest share (69.9%) and Prowers County the lowest (28.5%).
The busiest year on file was 2019, with 49 tests reported; the quietest, 2014, had 7.
Over 3 years of annual figures the share fell 11.2 points, from 61.2% in 2019 to 50.0% in 2022; its peak was 61.2% in 2019. Nationally, every county with a figure for the same period pools to 36.0%; Moffat County sits 19.0 points above it. CDC also counts 5 tests taken after mitigation in Moffat County for the same period: tests in homes where a fix was already in.
Moffat CountyColorado, pooled
50.0% % of tests38.6% % of tests
| Year | Tests | Moffat County, at or above 4 pCi/L | Colorado, pooled |
|---|---|---|---|
| 2019 | 49 | 61.2% | 44.1% |
| 2021 | 32 | 53.1% | 47.3% |
| 2022 | 38 | 50.0% | 38.6% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Moffat County, State data
Colorado's own radon test data
MeasuredWhat Colorado's own agencies publish about radon tests in Moffat 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 Moffat 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
52.3%
139 of 266 tests
Median result
4.1 pCi/L
Highest result
180.0 pCi/L
Tests behind these figures
266 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.
Moffat County, Geology
The ground under Moffat County
PredictedUSGS's geologic map splits Moffat County: 61.4% of its land is high radon potential and 38.6% moderate. The map puts 61.4% of Moffat County in the area it calls Paradox Basin and 23.1% in Eastern Uinta Mountains, with one smaller area beside them. USGS gives the first a radon index of 13, 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 |
|---|---|---|---|---|
| Paradox Basin | Tertiary sandstone, siltstone and shale. | High | 13 | 61.4% |
| Eastern Uinta Mountains | Cretaceous marine shales with Tertiary continental sedimentary rocks on the southern flank. | Moderate | 11 | 23.1% |
| Western Slope | Paleozoic and Mesozoic sandstone, siltstone, shale, basalt. | Moderate | 11 | 15.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Moffat County beside the ground around it
Colorado as a whole has more high-potential ground than Moffat County: 74.8% of its land, against 61.4% here. Of the 6 counties that border it, 4 have more high-potential ground, Sweetwater County, WY the most at 99.6%.
The map rates the ground, not the air in any home.
Local help
Moffat County, Local resources
Radon testing and mitigation in Moffat 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
Moffat County, Questions
Questions about radon in Moffat County
Are radon levels high in Moffat County?
In 2023, 30.8% of the radon tests reported to CDC for Moffat County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.4 pCi/L. Of 47 Colorado counties with 30 or more tests for the same period, 17 reported a higher share; pooled, the state comes to 49.5%.
Which counties border Moffat County?
Moffat County borders 6 counties: Rio Blanco County, CO, Routt County, CO, Sweetwater County, WY, Daggett County, UT, Uintah County, UT and Carbon County, WY.
Products
Moffat County, Products
Testing a home in Moffat County
In Moffat County, 55.0% of 362 tests reported to CDC over the 2005 to 2014 laboratory totals reached 4 pCi/L, against 49.5% pooled across Colorado. In Zone 1 the year-round level in Moffat 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-1011 rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Moffat County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Moffat County
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Moffat County, Bordering counties
Counties bordering Moffat County
Calculated by Radon411- Radon levels in Uintah County, UTEPA zone 1
65.3%at or above 4 pCi/L
Median 4.6 pCi/L · 49 tests · 10.3 points above Moffat County
- Radon levels in Sweetwater County, WYEPA zone 1
49.4%at or above 4 pCi/L
Median 3.9 pCi/L · 433 tests · 5.6 points below Moffat County
- Radon levels in Routt County, COEPA zone 2
48.2%at or above 4 pCi/L
Median 3.8 pCi/L · 876 tests · 6.8 points below Moffat County
- Radon levels in Rio Blanco County, COEPA zone 1
42.9%at or above 4 pCi/L
Median 3.3 pCi/L · 14 tests · 12.1 points below Moffat County
- Radon levels in Carbon County, WYEPA zone 1
32.3%at or above 4 pCi/L
Median 2.4 pCi/L · 62 tests · 22.7 points below Moffat County
- Radon levels in Daggett County, UTEPA zone 2
No CDC figure for 2005 to 2014; its page reads it against its own neighbours.
Moffat County, Cities and towns
Cities and towns in Moffat County
About 13,122 people live in Moffat County by the Census Bureau's estimate for July 1, 2025, 145 fewer than in 2020 (−1.1%). Spread over its land, that is 2.8 people to the square mile. Craig alone is home to 8,874 of them, 67.6% of the total. Together its 2 incorporated places hold 69.5% of those residents; the other 30.5% live outside any of them. Testing is reported here more often than across the state: CDC's 362 reported tests for 2005 to 2014 come to 27.6 for every 1,000 residents (2025 estimate), against 11.4 for Colorado.
From Craig to Dinosaur, CDC publishes no figure by town: each reads Moffat County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Craig | 8,874 | −1.8% | 67.6% |
| Dinosaur | 242 | Level | 1.8% |
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).
Moffat County, Homes
Homes in Moffat County
Of Moffat County's 6,114 homes, 62% are detached houses, against 62% across Colorado; 20% are mobile homes. The homes are older than Colorado's as a whole: half were built before 1977 (1987 for Colorado), and 23% date from before 1960. 72% 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 | Moffat County | Colorado |
|---|---|---|
| Housing units | 6,114 | 2,545,124 |
| Detached houses | 62% | 62% |
| In buildings of 5 or more | 9% | 22% |
| Mobile homes | 20% | 4% |
| Built before 1960 | 23% | 16% |
| Built since 2000 | 12% | 31% |
| Middle year built | 1977 | 1987 |
| Owner-occupied | 72% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.