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 Apache County, Arizona
EPA puts Apache County in Zone 2, its middle radon zone, and only 4 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
37.6%
Montezuma County
- Montezuma
- 37.6%
- San Juan
- 33.9%
2 of 9 neighbours have 30+ tests, 2008 to 2017
Nearest county
30.0%
Coconino County, 132 miles
- Coconino
- 30.0%
- Arizona
- 16.8%
Share at 4+ pCi/L, 273 tests, 2008 to 2017
Ground above low
100.0%
42.8 pts above Arizona
- Apache
- 100.0%
- Arizona
- 57.2%
Share of land USGS rates moderate or high potential
Tests reported
4
Too few for a share
- Apache
- 4
- 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 Apache 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
Apache County, At a glance
Apache County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Apache 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 Apache County, 2008 to 2017, laboratory
CDC holds 4 reported tests for Apache County over the 2008 to 2017 laboratory totals, with a median of 1.9 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Apache County beside the counties around it is how this page reads it.
What these figures count
Only 4 tests were reported to CDC for Apache 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. Measured data period: 2008 to 2017.
Apache County, Compared
Apache County radon figures, compared
Calculated by Radon411CDC's largest figure for Apache County rests on 4 tests over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 25.0 points and no rank or comparison is drawn from it. Results reached as high as 2.5 pCi/L, with a middle value of 1.9 pCi/L.
Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Montezuma County, CO reported the largest share at or above 4 pCi/L, 37.6%, and San Juan County, NM the smallest, 33.9%. Farther out, Coconino County (132 miles away) at 30.0%, Yavapai County (182 miles away) at 16.2% and Pinal County (202 miles away) at 8.9% 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 Apache 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.
Apache County, Geology
The ground under Apache County
PredictedMost of the ground under Apache 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 57.5% of Apache County in the area it calls Colorado Plateau and 19.2% in Colorado Plateau, with 4 smaller areas beside them. USGS gives the first a radon index of 11 and the second 9, both in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Colorado Plateau | Jurassic-Triassic nonmarine sandstones and shales. | Moderate | 11 | 57.5% |
| Colorado Plateau | Triassic and Jurassic eolian sandstones. | Moderate | 9 | 19.2% |
| Colorado Plateau | Paleozoic sadstone, shale, and limestones, some Precambrian gneiss, metasedimentary rocks, granites. | Moderate | 9 | 10.2% |
| Transition Zone | Precambrian igneous, metamorphic and sedimentary rocks and Tertiary volcanic rocks. | Moderate | 10 | 8.0% |
| Black Mesa | Cretaceous marine sandstones and shales. | Moderate | 11 | 4.2% |
| Grants Uranium Belt | Upper Creataceous marine shales and uranium-bearing Jurassic fluvial sandstones of the Grants uranium belt. | 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.
Apache County beside the ground around it
On high-potential ground Apache County is close to Arizona as a whole: 1.0% of its land against 0.1%. Of the 9 counties that border it, 6 have more high-potential ground, Montezuma County, CO the most at 75.5%.
The map rates the ground, not the air in any home.
Local help
Apache County, Local resources
Radon testing and mitigation in Apache 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
Apache County, Questions
Questions about radon in Apache County
Are radon levels high in Apache County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Apache County, Arizona were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.9 pCi/L. Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Montezuma County, CO reported the largest share at or above 4 pCi/L, 37.6%, and San Juan County, NM the smallest, 33.9%.
Which counties border Apache County?
Apache County borders 9 counties: Navajo County, AZ, McKinley County, NM, Cibola County, NM, San Juan County, NM, Catron County, NM, Greenlee County, AZ, Montezuma County, CO, Graham County, AZ and San Juan County, UT.
Products
Apache County, Products
Testing a home in Apache County
No CDC figure names Apache County; the nearest county with one, Coconino County (132 miles away), reported 30.0% 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 Apache 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
MonitorAEGTEST
HOUND-3699 radon monitor with a 2.1-inch touchscreen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
First reading: Within 1 hour
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Apache County, Bordering counties
Counties bordering Apache County
Calculated by Radon411- Radon levels in San Juan County, UTEPA zone 2
66.7%at or above 4 pCi/L
Median 5.1 pCi/L · 15 tests
- Radon levels in Cibola County, NMEPA zone 2
53.8%at or above 4 pCi/L
Median 5.5 pCi/L · 13 tests
- Radon levels in Montezuma County, COEPA zone 1
37.6%at or above 4 pCi/L
Median 3.1 pCi/L · 170 tests
- Radon levels in Graham County, AZEPA zone 2
36.4%at or above 4 pCi/L
Median 3.0 pCi/L · 11 tests
- Radon levels in San Juan County, NMEPA zone 2
33.9%at or above 4 pCi/L
Median 2.4 pCi/L · 56 tests
- Radon levels in McKinley County, NMEPA zone 2
27.3%at or above 4 pCi/L
Median 2.2 pCi/L · 22 tests
- Radon levels in Navajo County, AZEPA zone 2
0.0%at or above 4 pCi/L
Median 1.1 pCi/L · 16 tests
- Radon levels in Catron County, NMEPA zone 2
0.0%at or above 4 pCi/L
Median 3.9 pCi/L · 1 test
- Radon levels in Greenlee County, AZEPA zone 2
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Apache County, Cities and towns
Cities and towns in Apache County
About 64,445 people live in Apache County by the Census Bureau's estimate for July 1, 2025, 1,468 fewer than in 2020 (−2.2%). Spread over its land, that is 5.8 people to the square mile. No town dominates: Eagar, the largest, has 4,459 residents, 6.9% of the total. Together its 3 incorporated places hold 14.8% of those residents; the other 85.2% live outside any of them. Reported testing is thin here: 4 tests over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Arizona as a whole comes to 0.5.
From Eagar to Springerville, CDC publishes no figure by town: each reads Apache County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Eagar | 4,459 | +1.8% | 6.9% |
| St. Johns | 3,336 | −2.6% | 5.2% |
| Springerville | 1,719 | +0.1% | 2.7% |
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).
Apache County, Homes
Homes in Apache County
Of Apache County's 29,001 homes, 70% are detached houses, against 64% across Arizona; 23% are mobile homes. Half of its homes were built before 1988, close to Arizona's 1992: 5% date from before 1960 and 24% from 2000 or later. Owners live in 79% of the occupied homes (Arizona: 67%), so for most households a test and a fix are their own to order.
| Homes | Apache County | Arizona |
|---|---|---|
| Housing units | 29,001 | 3,142,443 |
| Detached houses | 70% | 64% |
| In buildings of 5 or more | 2% | 16% |
| Mobile homes | 23% | 10% |
| Built before 1960 | 5% | 8% |
| Built since 2000 | 24% | 35% |
| Middle year built | 1988 | 1992 |
| Owner-occupied | 79% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.