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 Yuma County, Arizona
EPA puts Yuma County in Zone 2, its middle radon zone, and only 18 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
17.4%
Maricopa County
- Maricopa
- 17.4%
- Pima
- 6.8%
2 of 4 neighbours have 30+ tests, 2008 to 2017
Nearest county
17.4%
Maricopa County, 91 miles
- Maricopa
- 17.4%
- Arizona
- 16.8%
Share at 4+ pCi/L, 2,393 tests, 2008 to 2017
Ground above low
None
57.2 pts below Arizona
- Yuma
- 0.0%
- Arizona
- 57.2%
Share of land USGS rates moderate or high potential
Tests reported
21
Too few for a share
- Yuma
- 21
- 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 Yuma 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
Yuma County, At a glance
Yuma County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Yuma County is a
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Yuma County, 2008 to 2017, laboratory
CDC holds 18 reported tests for Yuma County over the 2008 to 2017 laboratory totals, with a median of 0.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Yuma County beside the counties around it is how this page reads it.
What these figures count
Only 18 tests were reported to CDC for Yuma 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).
Yuma County, Compared
Yuma County radon figures, compared
Calculated by Radon411CDC's largest figure for Yuma County rests on 21 tests over the 2007 to 2016 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 4.8 points and no rank or comparison is drawn from it. Results reached as high as 2.2 pCi/L, with a middle value of 0.8 pCi/L.
Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Maricopa County reported the largest share at or above 4 pCi/L, 17.4%, and Pima County the smallest, 6.8%. Farther out, Yavapai County (148 miles away) at 16.2%, Pinal County (149 miles away) at 8.9% and Mohave County (202 miles away) at 4.1% have figures too. Pooled across 13 Arizona counties, 16.8% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Coconino County reported the highest share (30.0%) and Mohave County the lowest (4.1%). EPA's 1993 map puts Yuma County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Yuma County, Geology
The ground under Yuma County
PredictedUSGS's geologic map puts all of Yuma County's mapped land in one class: low radon potential. All of it lies in the area the map calls Basin and Range/Sonoran Desert, to which USGS gives a radon index of 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Basin and Range/Sonoran Desert | Quaternary to Tertiary sediments, with uranium-bearing Tertiary volcanic rocks, highly variable volcanic, metamorphic, and sedimentary rocks, and eolian deposits | Low | 8 | 99.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Yuma County beside the ground around it
Across Arizona 0.1% of the land is rated high; none of Yuma County's is. Of the 4 counties that border it, 1 has more moderate-potential ground, Maricopa County the most at 15.9%.
The map rates the ground, not the air in any home.
Local help
Yuma County, Local resources
Radon testing and mitigation in Yuma County
- Arizona's radon programArizona Department of Health ServicesArizona's radon program answers questions about testing, mitigation and the rules in Arizona.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 Arizona directoryNo professionals are listed in Arizona yet. The state program can point you to registered testers and mitigators.
What it means
Yuma County, Questions
Questions about radon in Yuma County
Are radon levels high in Yuma County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Yuma County, Arizona were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.6 pCi/L. Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Maricopa County reported the largest share at or above 4 pCi/L, 17.4%, and Pima County the smallest, 6.8%.
Which counties border Yuma County?
Yuma County borders 4 counties: La Paz County, AZ, Maricopa County, AZ, Imperial County, CA and Pima County, AZ.
Products
Yuma County, Products
Testing a home in Yuma County
No CDC figure names Yuma County; the nearest county with one, Maricopa County (91 miles away), reported 17.4% 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 Yuma 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
MonitorX-Sense
XR0A-iR Wi-Fi battery radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Wi-Fi
- Screen, app
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
Yuma County, Bordering counties
Counties bordering Yuma County
Calculated by Radon411- Radon levels in Maricopa County, AZEPA zone 2
17.4%at or above 4 pCi/L
Median 1.6 pCi/L · 2,393 tests
- Radon levels in Pima County, AZEPA zone 2
6.8%at or above 4 pCi/L
Median 1.1 pCi/L · 410 tests
- Radon levels in Imperial County, CAEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 11 tests
- Radon levels in La Paz County, AZEPA zone 2
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Yuma County, Cities and towns
Cities and towns in Yuma County
Yuma County is growing: the Census Bureau puts it at 224,449 residents on July 1, 2025, up 9.2% from 205,618 in 2020. That works out to 41 people per square mile of land. Its largest town, Yuma, has 105,227 residents, 46.9% of the total. Together its 4 incorporated places hold 73.5% of those residents; the other 26.5% live outside any of them. Reported testing is thin here: 21 tests over 2007 to 2016, or 0.1 for every 1,000 residents (2025 estimate), where Arizona as a whole comes to 0.5.
From Yuma to Wellton, CDC publishes no figure by town: each reads Yuma County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Yuma | 105,227 | +8.1% | 46.9% |
| San Luis | 42,030 | +17.6% | 18.7% |
| Somerton | 14,934 | +4.9% | 6.7% |
| Wellton | 2,671 | +12.1% | 1.2% |
4 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).
Yuma County, Homes
Homes in Yuma County
Mobile homes are 31% of Yuma County's 93,924 homes and detached houses 54%, against 64% across Arizona. Half of its homes were built before 1994, close to Arizona's 1992: 8% date from before 1960 and 38% from 2000 or later. 70% of occupied homes are lived in by their owner (Arizona: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Yuma County | Arizona |
|---|---|---|
| Housing units | 93,924 | 3,142,443 |
| Detached houses | 54% | 64% |
| In buildings of 5 or more | 7% | 16% |
| Mobile homes | 31% | 10% |
| Built before 1960 | 8% | 8% |
| Built since 2000 | 38% | 35% |
| Middle year built | 1994 | 1992 |
| Owner-occupied | 70% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.