Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Iron County, Utah
EPA puts Iron County in Zone 2, its middle radon zone, and 21.1% of its 213 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
21.1%
15.0 pts below UT
- Iron
- 21.1%
- Utah
- 36.1%
213 tests, 2023
Median result
2.1pCi/L
Below action level
- Iron
- 2.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
213
11th of 22 by tests
- Iron
- 213
- Salt Lake
- 9,658
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 Utah
21 of 22
Lowest quarter
- Iron
- 21.1%
- Beaver
- 66.7%
By share, of 22 with 30+ tests
Read a result for Iron County
Starts at Iron County's median, 2.1 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.1 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. Iron County's median reported result, 2023.
The data
Iron County, At a glance
Iron County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Iron County is a
USGS geologic potential: Moderate across 64% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Iron County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 14.3% |
| 2015 | 19.5% |
| 2016 | 25.0% |
| 2017 | 5.0% |
| 2018 | 15.2% |
| 2019 | 10.0% |
| 2020 | 12.1% |
| 2021 | 7.3% |
| 2022 | 17.8% |
| 2023 | 21.1% |
2023: 21.1%. Across these years the share ran from 5.0% to 25.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 213 tests reported to CDC for Iron 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).
Iron County, Compared
Iron County radon figures, compared
Calculated by Radon411Iron County's 213 reported tests in 2023 had a middle value of 2.1 pCi/L and a maximum of 20.1 pCi/L, and 21.1% reached 4 pCi/L. Utah as a whole (29 Utah counties, pooled) comes to 36.1%: 15.0 points higher than here.
Among its state's counties it ranks 21st 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, 100 tests (46.9%) came in under 2 pCi/L, against 35.4% statewide, and 68 tests (31.9%) fell between 2 and 4, against 28.5% statewide. The busiest year on file was 2022, with 303 tests reported; the quietest, 2014, had 14.
EPA's 1993 zone map puts Iron County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 64% of the county's land moderate radon potential.
Next door, the shares run from 9.9% in Washington County to 66.7% in Beaver County, with Washington County below Iron County. Over 8 years of annual figures the share held within 2 points, from 19.5% in 2015 to 21.1% in 2023; its peak was 25.0% in 2016.
CDC also counts 9 tests taken after mitigation in Iron County for the same period: tests in homes where a fix was already in.
Iron CountyUtah, pooled
21.1% % of tests36.1% % of tests
| Year | Tests | Iron County, at or above 4 pCi/L | Utah, pooled |
|---|---|---|---|
| 2015 | 77 | 19.5% | 42.3% |
| 2016 | 44 | 25.0% | 39.8% |
| 2017 | 40 | 5.0% | 38.2% |
| 2018 | 33 | 15.2% | 36.6% |
| 2020 | 33 | 12.1% | 37.6% |
| 2021 | 41 | 7.3% | 34.2% |
| 2022 | 303 | 17.8% | 37.7% |
| 2023 | 213 | 21.1% | 36.1% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Iron County, Geology
The ground under Iron County
PredictedUSGS's geologic map splits Iron County: 63.7% of its land is moderate radon potential and 36.3% high. The map puts 61.6% of Iron County in the area it calls Basin and Range and 34.1% in High Plateau, with 2 smaller areas beside them. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Basin and Range | Quaternary sedimentary and igneous rocks. | Moderate | 11 | 61.6% |
| High Plateau | Tertiary volcanic and volcaniclastic rocks. | High | 13 | 34.1% |
| Great Basin | Tertiary volcanic rocks composed of silicic ash-flow tuffs, rhyolitic flows, shallow intrusive rocks, andeside, and some tuffaceous sedimentary rocks. | High | 12 | 2.2% |
| Colorado Plateau | Paleozoic and Mesozoic sandstone, shale, limestone. | Moderate | 9 | 2.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Iron County beside the ground around it
On high-potential ground Iron County is close to Utah as a whole: 36.3% of its land against 32.8%. Of the 5 counties that border it, none has as large a share of high-potential ground; Garfield County comes nearest at 32.1%.
The map rates the ground, not the air in any home.
Local help
Iron County, Local resources
Radon testing and mitigation in Iron 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
Iron County, Questions
Questions about radon in Iron County
Are radon levels high in Iron County?
In 2023, 21.1% of the radon tests reported to CDC for Iron County, Utah were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.1 pCi/L. Of 22 Utah counties with 30 or more tests for the same period, 20 reported a higher share; pooled, the state comes to 36.1%.
Which counties border Iron County?
Iron County borders 5 counties: Beaver County, UT, Washington County, UT, Kane County, UT, Lincoln County, NV and Garfield County, UT.
Products
Iron County, Products
Testing a home in Iron County
In Iron County, 21.1% of 213 tests reported to CDC in 2023 reached 4 pCi/L, against 36.1% pooled across Utah. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Iron 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
Monitor
RadonScan USB-powered radon monitor with a color screen
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Iron County, Bordering counties
Counties bordering Iron County
Calculated by Radon411- Radon levels in Beaver County, UTEPA zone 2
66.7%at or above 4 pCi/L
Median 9.3 pCi/L · 42 tests · 45.6 points above Iron County
- Radon levels in Garfield County, UTEPA zone 2
40.0%at or above 4 pCi/L
Median 3.7 pCi/L · 15 tests · 18.9 points above Iron County
- Radon levels in Kane County, UTEPA zone 2
15.8%at or above 4 pCi/L
Median 1.8 pCi/L · 19 tests · 5.3 points below Iron County
- Radon levels in Washington County, UTEPA zone 2
9.9%at or above 4 pCi/L
Median 1.3 pCi/L · 657 tests · 11.2 points below Iron County
- Radon levels in Lincoln County, NVEPA zone 1
No CDC figure for 2023; its page reads it against its own neighbours.
Iron County, Cities and towns
Cities and towns in Iron County
Iron County is growing: the Census Bureau puts it at 67,141 residents on July 1, 2025, up 16.4% from 57,703 in 2020. That works out to 20 people per square mile of land. Cedar City alone is home to 41,871 of them, 62.4% of the total. Reported testing is thin here: 213 tests over 2023, or 3.2 for every 1,000 residents (2025 estimate), where Utah as a whole comes to 7.7.
From Cedar City to Cedar Highlands, CDC publishes no figure by town: each reads Iron County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Cedar City | 41,871 | +18.0% | 62.4% |
| Enoch | 8,847 | +18.2% | 13.2% |
| Parowan | 3,282 | +8.8% | 4.9% |
| Paragonah | 578 | +7.0% | 0.9% |
| Kanarraville | 491 | +10.8% | 0.7% |
| Brian Head | 162 | +10.2% | 0.2% |
- Cedar Highlands
7 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).
Iron County, Homes
Homes in Iron County
Of Iron County's 22,824 homes, 65% are detached houses, against 67% across Utah; 14% are in buildings of five or more homes. Half of its homes were built before 1996, close to Utah's 1991: 8% date from before 1960 and 40% from 2000 or later. 67% 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 | Iron County | Utah |
|---|---|---|
| Housing units | 22,824 | 1,193,082 |
| Detached houses | 65% | 67% |
| In buildings of 5 or more | 14% | 16% |
| Mobile homes | 5% | 3% |
| Built before 1960 | 8% | 16% |
| Built since 2000 | 40% | 37% |
| Middle year built | 1996 | 1991 |
| Owner-occupied | 67% | 71% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.