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 Inyo County, California
EPA puts Inyo County in Zone 2, its middle radon zone, and only 14 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
23.8%
Tulare County
- Tulare
- 23.8%
- San Bernardino
- 4.5%
6 of 8 neighbours have 30+ tests, 2008 to 2017
Nearest county
23.8%
Tulare County, 80 miles
- Tulare
- 23.8%
- California
- 10.3%
Share at 4+ pCi/L, 80 tests, 2008 to 2017
Ground above low
100.0%
57.3 pts above California
- Inyo
- 100.0%
- California
- 42.7%
Share of land USGS rates moderate or high potential
Tests reported
25
Too few for a share
- Inyo
- 25
- Needed
- 30
2007 to 2016, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Inyo County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 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.
The data
Inyo County, At a glance
Inyo County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Inyo County is a
USGS geologic potential: Moderate across 99% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Inyo County, 2008 to 2017, laboratory
CDC holds 14 reported tests for Inyo County over the 2008 to 2017 laboratory totals, with a median of 4.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Inyo County beside the counties around it is how this page reads it.
What these figures count
Only 14 tests were reported to CDC for Inyo County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Inyo County, Compared
Inyo County radon figures, compared
Calculated by Radon411CDC's largest figure for Inyo County rests on 25 tests over the 2007 to 2016 laboratory totals, 9 of them at or above 4 pCi/L, so each test moves its share by 4.0 points and no rank or comparison is drawn from it. Results reached as high as 22.6 pCi/L, with a middle value of 2.8 pCi/L.
Of the counties bordering it, 6 have a figure over the 2008 to 2017 laboratory totals: Tulare County reported the largest share at or above 4 pCi/L, 23.8%, and San Bernardino County the smallest, 4.5%, with Kern County at 11.6%, Nye County, NV at 11.1% and Fresno County at 11.0% between. Farther out, Madera County (139 miles away) at 14.7%, Los Angeles County (158 miles away) at 9.5% and Ventura County (170 miles away) at 11.9% have figures too. Pooled across 56 California counties, 10.3% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, El Dorado County reported the highest share (30.3%) and Sonoma County the lowest (0.8%). EPA's 1993 map puts Inyo County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 99% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Inyo County, State data
California's own radon test data
MeasuredWhat California's own agencies publish about radon tests in Inyo 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 Inyo County
The Nevada Radon Education Program publishes its figures by ZIP code, not by county. These are the 3 ZIP codes that lie wholly or partly in Inyo County, each with the state's own figures for it. Period: 1989-2015.
| ZIP code | What the state reports |
|---|---|
| 89019 | average 2.2 pCi/L |
| 89060 | average 1.6 pCi/L |
| 89061 | average 1.3 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.
Inyo County, Geology
The ground under Inyo County
PredictedMost of the ground under Inyo County is one class on USGS's geologic map: 99.0% of its land is moderate radon potential, with 1.0% high. The map puts 92.5% of Inyo County in the area it calls Basin and Range and 6.6% in Sierra Nevada, with one smaller area beside them. USGS gives both a radon index of 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Basin and Range | Precambrian metamorphic rocks, late Precambrian and Paleozoic metamorphosed and unmetamorphosed sedimentary rocks, Mesozoic and Tertiary intrusive rocks, and Tertiary sedimentary and volcanic rocks. | Moderate | 9 | 92.5% |
| Sierra Nevada | Northern Sierra Nevada is underlain primarily by Paleozoic and Mesozoic metamorphic rocks. Granitic rocks predominate in the southern Sierrra Nevada , with lesser Mesozoic metamorphic rocks. | Moderate | 9 | 6.6% |
| Great Basin | Tertiary volcanic rocks (silicic ash-flow tuffs, rhyolitic flows, and shallow intrusives). | High | 12 | 1.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Inyo County beside the ground around it
On high-potential ground Inyo County is close to California as a whole: 1.0% of its land against 0.1%. Of the 8 counties that border it, 2 have more high-potential ground, Nye County, NV the most at 16.4%.
The map rates the ground, not the air in any home.
Local help
Inyo County, Local resources
Radon testing and mitigation in Inyo County
- California Indoor Radon ProgramCalifornia Indoor Radon Program, run by California Department of Public Health, licenses or certifies radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in California.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Discounted test kits can be purchased through our partner laboratory, Alpha Energy, for $14.95.
- Compare kits
- Professionals in California4 professionals are listed in California.
What California's program says
- Phone
- 1-800-745-7236
- Radonprogram@cdph.ca.gov
- Licensing of radon professionals
The Radon Program certifies all radon service providers operating in California.
What it means
Inyo County, Questions
Questions about radon in Inyo County
Are radon levels high in Inyo County?
Over the 2008 to 2017 laboratory totals, 50.0% of the radon tests reported to CDC for Inyo County, California were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.0 pCi/L. Of the counties bordering it, 6 have a figure over the 2008 to 2017 laboratory totals: Tulare County reported the largest share at or above 4 pCi/L, 23.8%, and San Bernardino County the smallest, 4.5%, with Kern County at 11.6%, Nye County, NV at 11.1% and Fresno County at 11.0% between.
Which counties border Inyo County?
Inyo County borders 8 counties: Tulare County, CA, Esmeralda County, NV, Nye County, NV, Kern County, CA, Fresno County, CA, Mono County, CA, Clark County, NV and San Bernardino County, CA.
Products
Inyo County, Products
Testing a home in Inyo County
No CDC figure names Inyo County; the nearest county with one, Tulare County (80 miles away), reported 23.8% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Inyo 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
Hello Radon C battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Inyo County, Bordering counties
Counties bordering Inyo County
Calculated by Radon411- Radon levels in Mono County, CAEPA zone 2
50.0%at or above 4 pCi/L
Median 4.6 pCi/L · 20 tests
- Radon levels in Tulare County, CAEPA zone 2
23.8%at or above 4 pCi/L
Median 1.7 pCi/L · 80 tests
- Radon levels in Kern County, CAEPA zone 2
11.6%at or above 4 pCi/L
Median 1.8 pCi/L · 121 tests
- Radon levels in Nye County, NVEPA zone 2
11.1%at or above 4 pCi/L
Median 1.3 pCi/L · 81 tests
- Radon levels in Fresno County, CAEPA zone 2
11.0%at or above 4 pCi/L
Median 1.5 pCi/L · 100 tests
- Radon levels in Clark County, NVEPA zone 3
8.1%at or above 4 pCi/L
Median 0.9 pCi/L · 2,598 tests
4.5%at or above 4 pCi/L
Median 0.7 pCi/L · 178 tests
- Radon levels in Esmeralda County, NVEPA zone 2
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Inyo County, Cities and towns
Cities and towns in Inyo County
About 18,158 people live in Inyo County by the Census Bureau's estimate for July 1, 2025, 831 fewer than in 2020 (−4.4%). Spread over its land, that is 1.8 people to the square mile. Bishop, its one incorporated place, has 3,696 residents, 20.4% of the total. Testing is reported here more often than across the state: CDC's 25 reported tests for 2007 to 2016 come to 1.4 for every 1,000 residents (2025 estimate), against 0.3 for California.
Bishop is the one incorporated place here; CDC publishes no figure by town, so it reads Inyo County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Bishop | 3,696 | −3.3% | 20.4% |
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).
Inyo County, Homes
Homes in Inyo County
Of Inyo County's 9,500 homes, 63% are detached houses, against 57% across California; 25% are mobile homes. Half of its homes were built before 1973, close to California's 1976: 27% date from before 1960 and 12% from 2000 or later. 67% of occupied homes are lived in by their owner (California: 56%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Inyo County | California |
|---|---|---|
| Housing units | 9,500 | 14,532,683 |
| Detached houses | 63% | 57% |
| In buildings of 5 or more | 6% | 24% |
| Mobile homes | 25% | 4% |
| Built before 1960 | 27% | 27% |
| Built since 2000 | 12% | 18% |
| Middle year built | 1973 | 1976 |
| Owner-occupied | 67% | 56% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.