Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Graham County, Arizona
EPA puts Graham County in Zone 2, its middle radon zone, and only 11 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
8.9%
Pinal County
- Pinal
- 8.9%
- Pima
- 6.8%
2 of 7 neighbours have 30+ tests, 2008 to 2017
Nearest county
8.9%
Pinal County, 85 miles
- Pinal
- 8.9%
- Arizona
- 16.8%
Share at 4+ pCi/L, 101 tests, 2008 to 2017
Ground above low
70.4%
13.2 pts above Arizona
- Graham
- 70.4%
- Arizona
- 57.2%
Share of land USGS rates moderate or high potential
Tests reported
11
Too few for a share
- Graham
- 11
- Needed
- 30
2008 to 2017, 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 Graham 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
Graham County, At a glance
Graham County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Graham County is a
USGS geologic potential: Moderate across 70% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Graham County, 2008 to 2017, laboratory
CDC holds 11 reported tests for Graham County over the 2008 to 2017 laboratory totals, with a median of 3.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Graham County beside the counties around it is how this page reads it.
What these figures count
Only 11 tests were reported to CDC for Graham 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).
Graham County, Compared
Graham County radon figures, compared
Calculated by Radon411CDC's largest figure for Graham County rests on 11 tests over the 2008 to 2017 laboratory totals, 4 of them at or above 4 pCi/L, so each test moves its share by 9.1 points and no rank or comparison is drawn from it. Results reached as high as 21.0 pCi/L, with a middle value of 3.0 pCi/L.
Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Pinal County reported the largest share at or above 4 pCi/L, 8.9%, and Pima County the smallest, 6.8%. Farther out, Maricopa County (154 miles away) at 17.4%, Yavapai County (192 miles away) at 16.2% and Coconino County (227 miles away) at 30.0% 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 Graham County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 70% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Graham County, Geology
The ground under Graham County
PredictedUSGS's geologic map splits Graham County: 70.4% of its land is moderate radon potential and 29.6% low. The map puts 70.4% of Graham County in the area it calls Transition Zone and 29.6% in Basin and Range/Sonoran Desert. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Transition Zone | Precambrian igneous, metamorphic and sedimentary rocks and Tertiary volcanic rocks. | Moderate | 10 | 70.4% |
| 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 | 29.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Graham County beside the ground around it
Across Arizona 0.1% of the land is rated high; none of Graham County's is. Of the 7 counties that border it, 1 has more high-potential ground, Apache County the most at 1.0%.
The map rates the ground, not the air in any home.
Local help
Graham County, Local resources
Radon testing and mitigation in Graham 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
Graham County, Questions
Questions about radon in Graham County
Are radon levels high in Graham County?
Over the 2008 to 2017 laboratory totals, 36.4% of the radon tests reported to CDC for Graham County, Arizona were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.0 pCi/L. Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Pinal County reported the largest share at or above 4 pCi/L, 8.9%, and Pima County the smallest, 6.8%.
Which counties border Graham County?
Graham County borders 7 counties: Greenlee County, Cochise County, Gila County, Pinal County, Pima County, Apache County and Navajo County.
Products
Graham County, Products
Testing a home in Graham County
No CDC figure names Graham County; the nearest county with one, Pinal County (85 miles away), reported 8.9% 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 Graham 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
Wave Plus battery radon and air quality monitor
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- App only
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Graham County, Bordering counties
Counties bordering Graham 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
- Radon levels in Cochise CountyEPA zone 2
26.9%at or above 4 pCi/L
Median 2.8 pCi/L · 26 tests
- Radon levels in Pinal CountyEPA zone 2
8.9%at or above 4 pCi/L
Median 0.9 pCi/L · 101 tests
- Radon levels in Pima CountyEPA zone 2
6.8%at or above 4 pCi/L
Median 1.1 pCi/L · 410 tests
- Radon levels in Apache CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 1.9 pCi/L · 4 tests
- Radon levels in Navajo CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 1.1 pCi/L · 16 tests
- Radon levels in Greenlee CountyEPA zone 2
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Graham County, Cities and towns
Cities and towns in Graham County
The Census Bureau estimates 40,157 residents in Graham County for July 1, 2025, 1,531 more than in 2020 (+4.0%). Spread over its land, that is 8.7 people to the square mile. Its largest town, Safford, has 10,279 residents, 25.6% of the total. Together its 3 incorporated places hold 47.7% of those residents; the other 52.3% live outside any of them. Reported testing is thin here: 11 tests over 2008 to 2017, or 0.3 for every 1,000 residents (2025 estimate), where Arizona as a whole comes to 0.5.
From Safford to Pima, CDC publishes no figure by town: each reads Graham County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Safford | 10,279 | +1.3% | 25.6% |
| Thatcher | 5,690 | +7.2% | 14.2% |
| Pima | 3,181 | +11.5% | 7.9% |
3 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).
Graham County, Homes
Homes in Graham County
Of Graham County's 13,941 homes, 75% are detached houses, against 64% across Arizona; 18% are mobile homes. Half of its homes were built before 1987, close to Arizona's 1992: 16% date from before 1960 and 31% from 2000 or later. 74% 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 | Graham County | Arizona |
|---|---|---|
| Housing units | 13,941 | 3,142,443 |
| Detached houses | 75% | 64% |
| In buildings of 5 or more | 3% | 16% |
| Mobile homes | 18% | 10% |
| Built before 1960 | 16% | 8% |
| Built since 2000 | 31% | 35% |
| Middle year built | 1987 | 1992 |
| Owner-occupied | 74% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.