Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Carroll County, Arkansas
EPA puts Carroll County in Zone 2, its middle radon zone, and only 17 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
43.4%
Barry County
- Barry
- 43.4%
- Benton
- 31.0%
4 of 7 neighbours have 30+ tests, 2007 to 2016
Nearest county
31.0%
Benton County, 40 miles
- Benton
- 31.0%
- Arkansas
- 22.7%
Share at 4+ pCi/L, 145 tests, 2007 to 2016
Ground above low
95.4%
74.1 pts above Arkansas
- Carroll
- 95.4%
- Arkansas
- 21.3%
Share of land USGS rates moderate or high potential
Tests reported
21
Too few for a share
- Carroll
- 21
- Needed
- 30
2005 to 2014, 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 Carroll 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
Carroll County, At a glance
Carroll County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Carroll County is a
USGS geologic potential: Moderate across 95% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Carroll County, 2008 to 2017, laboratory
CDC holds 17 reported tests for Carroll County over the 2008 to 2017 laboratory totals, with a median of 2.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Carroll County beside the counties around it is how this page reads it.
What these figures count
Only 17 tests were reported to CDC for Carroll 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).
Carroll County, Compared
Carroll County radon figures, compared
Calculated by Radon411CDC's largest figure for Carroll County rests on 21 tests over the 2005 to 2014 laboratory totals, 6 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 13.6 pCi/L, with a middle value of 1.8 pCi/L.
Of the counties bordering it, 4 have a figure over the 2007 to 2016 laboratory totals: Barry County, MO reported the largest share at or above 4 pCi/L, 43.4%, and Benton County the smallest, 31.0%, with Stone County, MO at 41.7% and Taney County, MO at 34.7% between. Farther out, Washington County (45 miles away) at 14.3%, Garland County (124 miles away) at 45.8% and Saline County (127 miles away) at 31.9% have figures too. 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 Carroll County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 95% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Carroll County, Geology
The ground under Carroll County
PredictedMost of the ground under Carroll County is one class on USGS's geologic map: 95.4% of its land is moderate radon potential, with 4.6% low. The map puts 52.3% of Carroll County in the area it calls Salem Plateau and 42.8% in Springfield Plateau, with one smaller area beside them. USGS gives both a radon index of 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Salem Plateau | Ordovician dolomite. | Moderate | 9 | 52.3% |
| Springfield Plateau | Mississippian limestone, shale, and sandstone. | Moderate | 9 | 42.8% |
| Boston Mountains | Mississippian and Pennsylvanian sandstones and shales. | Low | 8 | 4.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Carroll County beside the ground around it
Carroll County has more moderate-potential ground than Arkansas as a whole: 95.4% of its land against 21.3%. Of the 7 counties that border it, 4 have more moderate-potential ground, Barry County, MO the most at 100%.
The map rates the ground, not the air in any home.
Local help
Carroll County, Local resources
Radon testing and mitigation in Carroll 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
Carroll County, Questions
Questions about radon in Carroll County
Are radon levels high in Carroll County?
Over the 2008 to 2017 laboratory totals, 29.4% of the radon tests reported to CDC for Carroll County, Arkansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. Of the counties bordering it, 4 have a figure over the 2007 to 2016 laboratory totals: Barry County, MO reported the largest share at or above 4 pCi/L, 43.4%, and Benton County the smallest, 31.0%, with Stone County, MO at 41.7% and Taney County, MO at 34.7% between.
Which counties border Carroll County?
Carroll County borders 7 counties: Madison County, AR, Stone County, MO, Barry County, MO, Boone County, AR, Newton County, AR, Benton County, AR and Taney County, MO.
Products
Carroll County, Products
Testing a home in Carroll County
No CDC figure names Carroll County; the nearest county with one, Benton County (40 miles away), reported 31.0% 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. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Carroll County; a long-term test tells the year-round average.
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
MonitorSafetySiren
Pro4 plug-in radon detector with a display and alarm
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 48 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Carroll County, Bordering counties
Counties bordering Carroll County
Calculated by Radon411- Radon levels in Barry County, MOEPA zone 2
43.4%at or above 4 pCi/L
Median 3.3 pCi/L · 53 tests
- Radon levels in Stone County, MOEPA zone 2
41.7%at or above 4 pCi/L
Median 2.9 pCi/L · 132 tests
- Radon levels in Boone County, AREPA zone 2
34.8%at or above 4 pCi/L
Median 3.3 pCi/L · 23 tests
- Radon levels in Taney County, MOEPA zone 2
34.7%at or above 4 pCi/L
Median 2.8 pCi/L · 144 tests
- Radon levels in Benton County, AREPA zone 2
31.0%at or above 4 pCi/L
Median 1.8 pCi/L · 145 tests
- Radon levels in Madison County, AREPA zone 3
16.7%at or above 4 pCi/L
Median 1.0 pCi/L · 6 tests
- Radon levels in Newton County, AREPA zone 3
0.0%at or above 4 pCi/L
Median 3.0 pCi/L · 1 test
Carroll County, Cities and towns
Cities and towns in Carroll County
The Census Bureau estimates 29,263 residents in Carroll County for July 1, 2025, 1,018 more than in 2020 (+3.6%). That works out to 46 people per square mile of land. No town dominates: Berryville, the largest, has 5,813 residents, 19.9% of the total. Testing is reported here more often than across the state: CDC's 21 reported tests for 2005 to 2014 come to 0.7 for every 1,000 residents (2025 estimate), against 0.2 for Arkansas.
From Berryville to Blue Eye, CDC publishes no figure by town: each reads Carroll County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Berryville | 5,813 | +2.7% | 19.9% |
| Green Forest | 3,246 | +8.1% | 11.1% |
| Eureka Springs | 2,258 | +4.0% | 7.7% |
| Oak Grove | 396 | +3.1% | 1.4% |
| Alpenaextends beyond Carroll County | 388 | +2.4% | Counted whole |
| Beaver | 70 | +1.4% | 0.2% |
| Blue Eye | 43 | +2.4% | 0.1% |
7 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). A place that extends beyond Carroll County is counted whole, so it has no share.
Carroll County, Homes
Homes in Carroll County
Carroll County is a place of houses on their own lots: 76% of its 13,916 homes are detached single-family houses, against 70% across Arkansas. Half of its homes were built before 1989, close to Arkansas' 1987: 14% date from before 1960 and 22% from 2000 or later. Owners live in 78% of the occupied homes (Arkansas: 66%), so for most households a test and a fix are their own to order.
| Homes | Carroll County | Arkansas |
|---|---|---|
| Housing units | 13,916 | 1,382,664 |
| Detached houses | 76% | 70% |
| In buildings of 5 or more | 3% | 10% |
| Mobile homes | 13% | 11% |
| Built before 1960 | 14% | 14% |
| Built since 2000 | 22% | 28% |
| Middle year built | 1989 | 1987 |
| Owner-occupied | 78% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.