Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Franklin County, Arkansas
EPA puts Franklin County in Zone 3, its lowest radon zone, and only 1 radon test from it is 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
Nearest county
14.3%
Washington County, 37 miles
- Washington
- 14.3%
- Arkansas
- 22.7%
Share at 4+ pCi/L, 56 tests, 2007 to 2016
Ground above low
None
21.3 pts below Arkansas
- Franklin
- 0.0%
- Arkansas
- 21.3%
Share of land USGS rates moderate or high potential
Tests reported
1
Too few for a share
- Franklin
- 1
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Franklin 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
Franklin County, At a glance
Franklin County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
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 Franklin County, 2008 to 2017, laboratory
CDC holds 1 reported test for Franklin County over the 2008 to 2017 laboratory totals, a result of 0.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Franklin County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Franklin 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: 2006 to 2017 (every CDC figure on file).
Franklin County, Compared
Franklin County radon figures, compared
Calculated by Radon411CDC's largest figure for Franklin County rests on 1 test over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 0.1 pCi/L, with a middle value of 0.1 pCi/L.
The nearest counties with a figure are Washington County (37 miles away) at 14.3%, Benton County (61 miles away) at 31.0% and Garland County (77 miles away) at 45.8%. Pooled across 60 Arkansas counties, 22.7% of reported tests reached that level; across every county in the country with a figure, 35.8%.
Statewide for the same period, Garland County reported the highest share (45.8%) and Pulaski County the lowest (6.8%). EPA's 1993 map puts Franklin County in Zone 3, its lowest label: a predicted county average under 2 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.
Franklin County, Geology
The ground under Franklin County
PredictedUSGS's geologic map puts all of Franklin County's mapped land in one class: low radon potential. The map puts 52.8% of Franklin County in the area it calls Arkansas Valley and 47.2% in Boston Mountains. USGS gives both 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 |
|---|---|---|---|---|
| Arkansas Valley | Mississippian and Pennsylvanian sandstones and shales. | Low | 8 | 52.8% |
| Boston Mountains | Mississippian and Pennsylvanian sandstones and shales. | Low | 8 | 47.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Franklin County beside the ground around it
Across Arkansas 21.3% of the land is rated moderate; none of Franklin County's is. Of the 5 counties that border it, 1 has more moderate-potential ground, Madison County the most at 36.4%.
The map rates the ground, not the air in any home.
Local help
Franklin County, Local resources
Radon testing and mitigation in Franklin County
- Arkansas's radon programArkansas Department of HealthArkansas's radon program answers questions about testing, mitigation and the rules in Arkansas.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 Arkansas directoryNo professionals are listed in Arkansas yet. The state program can point you to registered testers and mitigators.
What Arkansas's program says
- Phone
- 501-661-2621
- ADH.EPI.Radon@arkansas.gov
What it means
Franklin County, Questions
Questions about radon in Franklin County
Are radon levels high in Franklin County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Franklin County, Arkansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of the 5 nearest counties with a figure, within 103 miles, the share of tests at or above 4 pCi/L runs from 6.8% to 45.8%.
Which counties border Franklin County?
Franklin County borders 5 counties: Crawford County, Logan County, Johnson County, Sebastian County and Madison County.
Products
Franklin County, Products
Testing a home in Franklin County
No CDC figure names Franklin County; the nearest county with one, Washington County (37 miles away), reported 14.3% of its tests at or above 4 pCi/L over the 2007 to 2016 laboratory totals, the only reading nearby until a test of this home. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Franklin County.
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
RM-65 rechargeable radon detector with a color screen and alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Franklin County, Bordering counties
Counties bordering Franklin County
Calculated by Radon411- Radon levels in Johnson CountyEPA zone 3
66.7%at or above 4 pCi/L
Median 9.7 pCi/L · 3 tests
- Radon levels in Logan CountyEPA zone 3
20.0%at or above 4 pCi/L
Median 2.1 pCi/L · 5 tests
- Radon levels in Madison CountyEPA zone 3
16.7%at or above 4 pCi/L
Median 1.0 pCi/L · 6 tests
- Radon levels in Crawford CountyEPA zone 3
12.5%at or above 4 pCi/L
Median 0.7 pCi/L · 8 tests
- Radon levels in Sebastian CountyEPA zone 3
3.4%at or above 4 pCi/L
Median 0.1 pCi/L · 29 tests
Franklin County, Cities and towns
Cities and towns in Franklin County
The Census Bureau estimates 17,725 residents in Franklin County for July 1, 2025, 594 more than in 2020 (+3.5%). That works out to 29 people per square mile of land. Its largest town, Ozark, has 3,628 residents, 20.5% of the total. Together its 6 incorporated places hold 43.1% of those residents; the other 56.9% live outside any of them. Reported testing is thin here: 1 test over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Arkansas as a whole comes to 0.2.
From Ozark to Wiederkehr Village, CDC publishes no figure by town: each reads Franklin County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Ozark | 3,628 | +2.8% | 20.5% |
| Charleston | 2,760 | +6.8% | 15.6% |
| Altus | 681 | +1.3% | 3.8% |
| Branch | 314 | +3.0% | 1.8% |
| Denning | 209 | +5.0% | 1.2% |
| Wiederkehr Village | 39 | +2.6% | 0.2% |
6 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).
Franklin County, Homes
Homes in Franklin County
Of Franklin County's 7,751 homes, 75% are detached houses, against 70% across Arkansas; 14% are mobile homes. Half of its homes were built before 1984, close to Arkansas' 1987: 15% date from before 1960 and 24% from 2000 or later. 74% of occupied homes are lived in by their owner (Arkansas: 66%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Franklin County | Arkansas |
|---|---|---|
| Housing units | 7,751 | 1,382,664 |
| Detached houses | 75% | 70% |
| In buildings of 5 or more | 3% | 10% |
| Mobile homes | 14% | 11% |
| Built before 1960 | 15% | 14% |
| Built since 2000 | 24% | 28% |
| Middle year built | 1984 | 1987 |
| Owner-occupied | 74% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.