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 Pinal County, Arizona
EPA puts Pinal County in Zone 2, its middle radon zone, and most reported tests there come back low, though 8.9% of 101 (2008 to 2017, laboratory totals) reached 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
8.9%
7.9 pts below AZ
- Pinal
- 8.9%
- Arizona
- 16.8%
101 tests, 2008 to 2017
Median result
0.9pCi/L
Below action level
- Pinal
- 0.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
101
5th of 6 by tests
- Pinal
- 101
- Maricopa
- 2,393
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 Arizona
4 of 6
Middle half
- Pinal
- 8.9%
- Coconino
- 30.0%
By share, of 6 with 30+ tests
Read a result for Pinal County
Starts at Pinal County's median, 0.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.9 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Pinal County's median reported result, 2008 to 2017.
The data
Pinal County, At a glance
Pinal County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Pinal County is a
USGS geologic potential: Low across 85% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Pinal County, 2008 to 2017, laboratory
Under 2 pCi/L: 77%2 to 4 pCi/L: 14%4 pCi/L and above: 9%
Of 101 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 78 | 77.2% |
| 2 to 4 pCi/L | 14 | 13.9% |
| 4 pCi/L and above | 9 | 8.9% |
What these figures count
These are the 101 tests reported to CDC for Pinal 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).
Pinal County, Compared
Pinal County radon figures, compared
Calculated by Radon411Pinal County reports fewer high tests than Arizona overall. 8.9% of its 101 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 7.9 points below the 16.8% pooled from 13 Arizona counties.
Ordered from highest share down, it comes 4th of 6 Arizona counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Pinal County sits 26.8 points below it.
Next door, the shares run from 6.8% in Pima County to 17.4% in Maricopa County, with Pima County below Pinal County. The reported tests do not follow EPA's Zone 2 label for Pinal County (predicted average between 2 and 4 pCi/L): 8.9% of them reached 4 pCi/L, fewer than that label suggests.
Half the tests came in under 0.9 pCi/L and half over it; the single highest reached 20.9 pCi/L. The rest split 77.2% under 2 pCi/L and 13.9% from 2 to 4 (Arizona: 60.1% and 23.2%).
CDC's ten-year totals for Pinal County went from 86 tests (2005 to 2014) to 101 (2008 to 2017), the share going from 8.1% to 8.9%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Pinal County, Geology
The ground under Pinal County
PredictedMost of the ground under Pinal County is one class on USGS's geologic map: 84.9% of its land is low radon potential, with 15.1% moderate. The map puts 84.9% of Pinal County in the area it calls Basin and Range/Sonoran Desert and 15.1% in Transition Zone. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 10, in the moderate band (9 to 11).
| 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 | 84.9% |
| Transition Zone | Precambrian igneous, metamorphic and sedimentary rocks and Tertiary volcanic rocks. | Moderate | 10 | 15.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Pinal County beside the ground around it
Across Arizona 0.1% of the land is rated high; none of Pinal County's is. Of the 4 counties that border it, 3 have more moderate-potential ground, Gila County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Pinal County, Local resources
Radon testing and mitigation in Pinal 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
Pinal County, Questions
Questions about radon in Pinal County
Are radon levels high in Pinal County?
Over the 2008 to 2017 laboratory totals, 8.9% of the radon tests reported to CDC for Pinal County, Arizona were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Of 6 Arizona counties with 30 or more tests for the same period, 3 reported a higher share; pooled, the state comes to 16.8%.
Which counties border Pinal County?
Pinal County borders 4 counties: Pima County, Gila County, Graham County and Maricopa County.
Products
Pinal County, Products
Testing a home in Pinal County
In Pinal County, 8.9% of 101 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 16.8% pooled across Arizona. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Pinal 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
Pinal County, Bordering counties
Counties bordering Pinal County
Calculated by Radon411- Radon levels in Gila CountyEPA zone 2
64.7%at or above 4 pCi/L
Median 5.7 pCi/L · 17 tests · 55.8 points above Pinal County
- Radon levels in Graham CountyEPA zone 2
36.4%at or above 4 pCi/L
Median 3.0 pCi/L · 11 tests · 27.5 points above Pinal County
- Radon levels in Maricopa CountyEPA zone 2
17.4%at or above 4 pCi/L
Median 1.6 pCi/L · 2,393 tests · 8.5 points above Pinal County
- Radon levels in Pima CountyEPA zone 2
6.8%at or above 4 pCi/L
Median 1.1 pCi/L · 410 tests · 2.1 points below Pinal County
Pinal County, Cities and towns
Cities and towns in Pinal County
Pinal County is growing: the Census Bureau puts it at 539,380 residents on July 1, 2025, up 25.4% from 430,231 in 2020. That works out to 101 people per square mile of land. Queen Creek, the largest place on its list (89,770 residents in all), extends beyond Pinal County, so no share of the total is worked out for it. Reported testing is thin here: 101 tests over 2008 to 2017, or 0.2 for every 1,000 residents (2025 estimate), where Arizona as a whole comes to 0.5.
From Queen Creek to Winkelman, CDC publishes no figure by town: each reads Pinal County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Queen Creekextends beyond Pinal County | 89,770 | +47.9% | Counted whole |
| Maricopa | 78,362 | +33.2% | 14.5% |
| Casa Grande | 69,753 | +28.8% | 12.9% |
| Maranaextends beyond Pinal County | 65,523 | +24.5% | Counted whole |
| Apache Junctionextends beyond Pinal County | 45,672 | +17.9% | Counted whole |
| Florence | 25,222 | −7.5% | 4.7% |
| Eloy | 19,967 | +27.2% | 3.7% |
| Coolidge | 19,959 | +48.7% | 3.7% |
| Superior | 2,611 | +7.6% | 0.5% |
| Kearny | 1,849 | +6.2% | 0.3% |
| Mammoth | 1,149 | +5.8% | 0.2% |
| Haydenextends beyond Pinal County | 510 | −1.5% | Counted whole |
- Winkelman (part)
13 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Pinal County is counted whole, so it has no share.
Pinal County, Homes
Homes in Pinal County
Pinal County is a place of houses on their own lots: 76% of its 179,861 homes are detached single-family houses, against 64% across Arizona. Much of Pinal County is recent building: 63% of its homes have gone up since 2000 and the middle year built is 2003, against 1992 for Arizona. Owners live in 81% of the occupied homes (Arizona: 67%), so for most households a test and a fix are their own to order.
| Homes | Pinal County | Arizona |
|---|---|---|
| Housing units | 179,861 | 3,142,443 |
| Detached houses | 76% | 64% |
| In buildings of 5 or more | 3% | 16% |
| Mobile homes | 17% | 10% |
| Built before 1960 | 5% | 8% |
| Built since 2000 | 63% | 35% |
| Middle year built | 2003 | 1992 |
| Owner-occupied | 81% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.