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 Carbon County, Utah
EPA puts Carbon County in Zone 1, its highest radon zone, and 23.2% of its 69 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
23.2%
12.9 pts below UT
- Carbon
- 23.2%
- Utah
- 36.1%
69 tests, 2023
Median result
2.3pCi/L
Below action level
- Carbon
- 2.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
69
17th of 22 by tests
- Carbon
- 69
- Salt Lake
- 9,658
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 Utah
20 of 22
Lowest quarter
- Carbon
- 23.2%
- Beaver
- 66.7%
By share, of 22 with 30+ tests
Read a result for Carbon County
Starts at Carbon 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. Carbon County's median reported result, 2023.
The data
Carbon County, At a glance
Carbon County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Carbon 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 Carbon County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 50.0% |
| 2015 | 60.0% |
| 2016 | 31.8% |
| 2017 | 20.0% |
| 2018 | 35.7% |
| 2019 | 50.0% |
| 2020 | 21.4% |
| 2021 | 43.2% |
| 2022 | 40.6% |
| 2023 | 23.2% |
2023: 23.2%. Across these years the share ran from 20.0% to 60.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 69 tests reported to CDC for Carbon 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).
Carbon County, Compared
Carbon County radon figures, compared
Calculated by Radon411Carbon County's 69 reported tests in 2023 had a middle value of 2.3 pCi/L and a maximum of 18.9 pCi/L, and 23.2% reached 4 pCi/L. Utah as a whole (29 Utah counties, pooled) comes to 36.1%: 12.9 points higher than here.
Among its state's counties it ranks 20th of 22 Utah counties with 30 or more tests for the same period. Statewide for the same period, Beaver County reported the highest share (66.7%) and Washington County the lowest (9.9%).
Below the action level, 27 tests (39.1%) came in under 2 pCi/L, against 35.4% statewide, and 26 tests (37.7%) fell between 2 and 4, against 28.5% statewide. The busiest year on file was 2022, with 384 tests reported; the quietest, 2014, had 2.
EPA's 1993 zone map puts Carbon County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.
Next door, the shares run from 23.9% in Grand County to 60.0% in Sanpete County. Over 3 years of annual figures the share fell 20.0 points, from 43.2% in 2021 to 23.2% in 2023; its peak was 43.2% in 2021.
CDC also counts 10 tests taken after mitigation in Carbon County for the same period: tests in homes where a fix was already in.
Carbon CountyUtah, pooled
23.2% % of tests36.1% % of tests
| Year | Tests | Carbon County, at or above 4 pCi/L | Utah, pooled |
|---|---|---|---|
| 2021 | 81 | 43.2% | 34.2% |
| 2022 | 384 | 40.6% | 37.7% |
| 2023 | 69 | 23.2% | 36.1% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Carbon County, Geology
The ground under Carbon County
PredictedUSGS's geologic map puts all of Carbon County's mapped land in one class: high radon potential. The map puts 49.0% of Carbon County in the area it calls Mancos Shale Lowlands and 36.6% in Uinta Basin, with one smaller area beside them. USGS gives both a radon index of 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Mancos Shale Lowlands | Marine rocks of the Mancos shale. | High | 13 | 49.0% |
| Uinta Basin | Uranium-bearing Tertiary sandstone and siltstone. | High | 13 | 36.6% |
| Northern High Plateau | Tertiary and Cretaceous sedimentary rocks. | High | 12 | 14.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Carbon County beside the ground around it
Carbon County has more high-potential ground than Utah as a whole: 100% of its land against 32.8%. Of the 6 counties that border it, none has as large a share of high-potential ground; Sanpete County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Carbon County, Local resources
Radon testing and mitigation in Carbon County
- Indoor Radon ProgramIndoor Radon Program, run by Utah Department of Environmental Quality, states the rule for disclosing radon when a home is sold, and answers questions about testing and mitigation in Utah.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- See the Utah directoryNo professionals are listed in Utah yet. The state program can point you to registered testers and mitigators.
What Utah's program says
- Phone
- (801) 536-0091
- Disclosure when a home is sold or rented
Utah requires that sellers disclose "Hazardous Conditions: Are there any hazardous conditions on the Property such as Radon gas in house or well?"
What it means
Carbon County, Questions
Questions about radon in Carbon County
Are radon levels high in Carbon County?
In 2023, 23.2% of the radon tests reported to CDC for Carbon County, Utah were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.3 pCi/L. Of 22 Utah counties with 30 or more tests for the same period, 19 reported a higher share; pooled, the state comes to 36.1%.
Which counties border Carbon County?
Carbon County borders 6 counties: Emery County, Duchesne County, Sanpete County, Uintah County, Grand County and Utah County.
Products
Carbon County, Products
Testing a home in Carbon County
In Carbon County, 23.2% of 69 tests reported to CDC in 2023 reached 4 pCi/L, against 36.1% pooled across Utah. In Zone 1 the year-round level in Carbon 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-1011S rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Carbon County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Carbon County
Explore
Carbon County, Bordering counties
Counties bordering Carbon County
Calculated by Radon411- Radon levels in Sanpete CountyEPA zone 1
60.0%at or above 4 pCi/L
Median 4.6 pCi/L · 150 tests · 36.8 points above Carbon County
- Radon levels in Uintah CountyEPA zone 1
51.0%at or above 4 pCi/L
Median 4.2 pCi/L · 104 tests · 27.8 points above Carbon County
- Radon levels in Utah CountyEPA zone 2
40.6%at or above 4 pCi/L
Median 3.2 pCi/L · 7,833 tests · 17.4 points above Carbon County
- Radon levels in Duchesne CountyEPA zone 1
39.5%at or above 4 pCi/L
Median 3.2 pCi/L · 81 tests · 16.3 points above Carbon County
- Radon levels in Emery CountyEPA zone 2
38.5%at or above 4 pCi/L
Median 2.7 pCi/L · 39 tests · 15.3 points above Carbon County
- Radon levels in Grand CountyEPA zone 1
23.9%at or above 4 pCi/L
Median 1.9 pCi/L · 46 tests · 0.7 points above Carbon County
Carbon County, Cities and towns
Cities and towns in Carbon County
The Census Bureau estimates 20,680 residents in Carbon County for July 1, 2025, 195 more than in 2020 (+1.0%). That works out to 14 people per square mile of land. Its largest town, Price, has 8,368 residents, 40.5% of the total. Together its 5 incorporated places hold 66.2% of those residents; the other 33.8% live outside any of them. Reported testing is thin here: 69 tests over 2023, or 3.3 for every 1,000 residents (2025 estimate), where Utah as a whole comes to 7.7.
From Price to Scofield, CDC publishes no figure by town: each reads Carbon County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Price | 8,368 | +1.2% | 40.5% |
| Helper | 2,126 | −0.4% | 10.3% |
| Wellington | 1,606 | +0.9% | 7.8% |
| East Carbon | 1,565 | +0.3% | 7.6% |
| Scofield | 26 | Level | 0.1% |
5 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).
Carbon County, Homes
Homes in Carbon County
Carbon County is a place of houses on their own lots: 76% of its 9,629 homes are detached single-family houses, against 67% across Utah. The homes are older than Utah's as a whole: half were built before 1972 (1991 for Utah), and 42% date from before 1960. 68% of occupied homes are lived in by their owner (Utah: 71%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Carbon County | Utah |
|---|---|---|
| Housing units | 9,629 | 1,193,082 |
| Detached houses | 76% | 67% |
| In buildings of 5 or more | 7% | 16% |
| Mobile homes | 10% | 3% |
| Built before 1960 | 42% | 16% |
| Built since 2000 | 9% | 37% |
| Middle year built | 1972 | 1991 |
| Owner-occupied | 68% | 71% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.