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 Humboldt County, Nevada
EPA puts Humboldt County in Zone 2, its middle radon zone, and 32.3% of its 65 reported radon tests (2008 to 2017, laboratory totals) 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
32.3%
9.5 pts above NV
- Humboldt
- 32.3%
- Nevada
- 22.8%
65 tests, 2008 to 2017
Median result
2.3pCi/L
Below action level
- Humboldt
- 2.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
65
10th of 11 by tests
- Humboldt
- 65
- Washoe
- 5,046
Reported to CDC before any fix, 2008 to 2017
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 Nevada
5 of 11
Middle half
- Humboldt
- 32.3%
- Carson City
- 40.6%
By share, of 11 with 30+ tests
Read a result for Humboldt County
Starts at Humboldt 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. Humboldt County's median reported result, 2008 to 2017.
The data
Humboldt County, At a glance
Humboldt County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Humboldt County is a
USGS geologic potential: Moderate across 75% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Humboldt County, 2008 to 2017, laboratory
Under 2 pCi/L: 42%2 to 4 pCi/L: 26%4 pCi/L and above: 32%
Of 65 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 27 | 41.5% |
| 2 to 4 pCi/L | 17 | 26.2% |
| 4 pCi/L and above | 21 | 32.3% |
What these figures count
These are the 65 tests reported to CDC for Humboldt County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Humboldt County, Compared
Humboldt County radon figures, compared
Calculated by Radon411In Humboldt County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (21 of 65) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 3.4 points lower. Across 16 Nevada counties pooled together, 22.8% of tests reached that level, so Humboldt County runs 9.5 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 22.2% (Washoe County) to 40.3% (Elko County). By share, Humboldt County is 5th of 11 Nevada counties with 30 or more tests for the same period.
Half the tests came in under 2.3 pCi/L and half over it; the single highest reached 26.4 pCi/L. Below the action level, 27 tests (41.5%) came in under 2 pCi/L, against 52.5% statewide, and 17 tests (26.2%) fell between 2 and 4, against 24.8% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 32.3% share point the same way here. USGS geology rates 75% of the county's land moderate radon potential.
CDC's ten-year totals for Humboldt County went from 56 tests (2005 to 2014) to 65 (2008 to 2017), the share going from 26.8% to 32.3%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Humboldt County, State data
Nevada's own radon test data
MeasuredWhat Nevada's own agencies publish about radon tests in Humboldt County, with their period. These are not CDC's figures and are never added to them.
MeasuredState figures, not CDC's
What the Nevada Radon Education Program reports for the ZIP codes in Humboldt County
The Nevada Radon Education Program publishes its figures by ZIP code, not by county. These are the 5 ZIP codes that lie wholly or partly in Humboldt County, each with the state's own figures for it. Period: 1989-2015.
| ZIP code | What the state reports |
|---|---|
| 89412 | average 4.2 pCi/L |
| 89414 | average 3.5 pCi/L |
| 89425 | average 13.9 pCi/L |
| 89426 | average 2.7 pCi/L |
| 89445 | average 3.4 pCi/L |
- NBMG says the results are based on independently tested homes, not scientific sampling.
- The service publishes an average for each ZIP code but no count of tests.
- Site specific testing is the only way to determine local radon concentrations.
- A ZIP code that crosses the county line is listed whole; its figures cover all of it.
Measured: Nevada Radon Education Program data, 1989-2015.
Humboldt County, Geology
The ground under Humboldt County
PredictedUSGS's geologic map splits Humboldt County: 74.8% of its land is moderate radon potential and 25.2% high. The map puts 33.5% of Humboldt County in the area it calls Great Basin and 16.7% in Great Basin, with 4 smaller areas beside them. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Great Basin | Sandstone, shale, limestone, mafic volcanic rocks. | Moderate | 11 | 33.5% |
| Great Basin | Triassic and Jurassic clastic sedimentary rocks, locally metamorphosed carbonate rocks intruded by Mesozoic granitic rocks. | High | 12 | 16.7% |
| Owyhee Upland | Tertiary and Quaternary basalt, andesite, and rhyolite. | Moderate | 9 | 16.1% |
| Northern Basin and Range | Basalt, andesite, rhyolite, tuffaceous sandstone. Low uranium in the western part, uranium-bearing volcanic rocks and uranium deposits in the eastern part of the province. | Moderate | 9 | 15.2% |
| Northern Basin and Range | Basalt, andesite, rhyolite, tuffaceous sedimentary rocks. Low soil uranium content in the western part, uranium-bearing volcanic rocks and uranium deposits in the eastern part of the province. | Moderate | 9 | 10.0% |
| Great Basin | Tertiary silicic ash-flow tuffs and granitic rocks. | High | 12 | 8.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Humboldt County beside the ground around it
On high-potential ground Humboldt County is close to Nevada as a whole: 25.2% of its land against 17.3%. Of the 7 counties that border it, 1 has more high-potential ground, Lander County the most at 34.0%.
The map rates the ground, not the air in any home.
Local help
Humboldt County, Local resources
Radon testing and mitigation in Humboldt County
- Nevada Radon Education ProgramNevada Radon Education Program, run by University Of Nevada, Reno, offers free or discounted test kits, and answers questions about testing and mitigation in Nevada.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
The program offers literature, maps, educational presentations and low-cost radon test kits.
- Compare kits
- Professionals in Nevada20 professionals are listed in Nevada.
What Nevada's program says
- chrisk@unr.edu
What it means
Humboldt County, Questions
Questions about radon in Humboldt County
Are radon levels high in Humboldt County?
Over the 2008 to 2017 laboratory totals, 32.3% of the radon tests reported to CDC for Humboldt County, Nevada were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.3 pCi/L. Of 11 Nevada counties with 30 or more tests for the same period, 4 reported a higher share; pooled, the state comes to 22.8%.
Which counties border Humboldt County?
Humboldt County borders 7 counties: Pershing County, NV, Washoe County, NV, Lander County, NV, Malheur County, OR, Harney County, OR, Elko County, NV and Owyhee County, ID.
Products
Humboldt County, Products
Testing a home in Humboldt County
In Humboldt County, 32.3% of 65 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 22.8% pooled across Nevada. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Humboldt 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
Humboldt County, Bordering counties
Counties bordering Humboldt County
Calculated by Radon411- Radon levels in Pershing County, NVEPA zone 1
52.0%at or above 4 pCi/L
Median 4.2 pCi/L · 25 tests · 19.7 points above Humboldt County
- Radon levels in Elko County, NVEPA zone 2
40.3%at or above 4 pCi/L
Median 3.1 pCi/L · 159 tests · 8.0 points above Humboldt County
- Radon levels in Lander County, NVEPA zone 1
29.4%at or above 4 pCi/L
Median 2.8 pCi/L · 17 tests · 2.9 points below Humboldt County
- Radon levels in Owyhee County, IDEPA zone 2
23.3%at or above 4 pCi/L
Median 2.1 pCi/L · 30 tests · 9.0 points below Humboldt County
- Radon levels in Washoe County, NVEPA zone 2
22.2%at or above 4 pCi/L
Median 1.9 pCi/L · 5,046 tests · 10.1 points below Humboldt County
- Radon levels in Harney County, OREPA zone 2
20.0%at or above 4 pCi/L
Median 0.7 pCi/L · 5 tests · 12.3 points below Humboldt County
- Radon levels in Malheur County, OREPA zone 2
8.3%at or above 4 pCi/L
Median 2.0 pCi/L · 12 tests · 24.0 points below Humboldt County
Humboldt County, Cities and towns
Cities and towns in Humboldt County
Humboldt County's population has barely moved since 2020: 17,267 residents on July 1, 2025 against 17,270 then, by the Census Bureau's estimates. Spread over its land, that is 1.8 people to the square mile. Winnemucca, its one incorporated place, has 8,307 residents, 48.1% of the total. CDC's 65 reported tests for 2008 to 2017 work out to 3.8 per 1,000 residents (2025 estimate), close to Nevada's 3.3.
Winnemucca is the one incorporated place here; CDC publishes no figure by town, so it reads Humboldt County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Winnemucca | 8,307 | −1.2% | 48.1% |
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).
Humboldt County, Homes
Homes in Humboldt County
Mobile homes are 33% of Humboldt County's 7,714 homes and detached houses 53%, against 60% across Nevada. Half of its homes were built before 1990, close to Nevada's 1996: 14% date from before 1960 and 24% from 2000 or later. 74% of occupied homes are lived in by their owner (Nevada: 59%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Humboldt County | Nevada |
|---|---|---|
| Housing units | 7,714 | 1,307,338 |
| Detached houses | 53% | 60% |
| In buildings of 5 or more | 5% | 22% |
| Mobile homes | 33% | 6% |
| Built before 1960 | 14% | 5% |
| Built since 2000 | 24% | 40% |
| Middle year built | 1990 | 1996 |
| Owner-occupied | 74% | 59% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.