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 Columbia County, Arkansas
EPA puts Columbia County in Zone 3, its lowest radon zone, and only 2 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
Nearest county
45.8%
Garland County, 94 miles
- Garland
- 45.8%
- Arkansas
- 22.7%
Share at 4+ pCi/L, 48 tests, 2007 to 2016
Ground above low
None
21.3 pts below Arkansas
- Columbia
- 0.0%
- Arkansas
- 21.3%
Share of land USGS rates moderate or high potential
Tests reported
2
Too few for a share
- Columbia
- 2
- 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 Columbia 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
Columbia County, At a glance
Columbia 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 Columbia County, 2008 to 2017, laboratory
CDC holds 2 reported tests for Columbia County over the 2008 to 2017 laboratory totals, with a median of 0.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Columbia County beside the counties around it is how this page reads it.
What these figures count
Only 2 tests were reported to CDC for Columbia 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).
Columbia County, Compared
Columbia County radon figures, compared
Calculated by Radon411CDC's largest figure for Columbia County rests on 2 tests over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 50.0 points and no rank or comparison is drawn from it. Results reached as high as 1.0 pCi/L, with a middle value of 0.6 pCi/L.
The nearest counties with a figure are Garland County (94 miles away) at 45.8%, Saline County (104 miles away) at 31.9% and Pulaski County (119 miles away) at 6.8%. 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 Columbia 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.
Columbia County, Geology
The ground under Columbia County
PredictedUSGS's geologic map puts all of Columbia County's mapped land in one class: low radon potential. All of it lies in the area the map calls West Gulf Coastal Plain, to which USGS gives a radon index of 7, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| West Gulf Coastal Plain | Glauconitic, phosphatic, and carbonaceous sediments. | Low | 7 | 99.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Columbia County beside the ground around it
Across Arkansas 21.3% of the land is rated moderate; none of Columbia County's is. None of the 6 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Columbia County, Local resources
Radon testing and mitigation in Columbia 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
Columbia County, Questions
Questions about radon in Columbia County
Are radon levels high in Columbia County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Columbia County, Arkansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.6 pCi/L. Of the 5 nearest counties with a figure, within 223 miles, the share of tests at or above 4 pCi/L runs from 6.8% to 45.8%.
Which counties border Columbia County?
Columbia County borders 6 counties: Lafayette County, AR, Claiborne Parish, LA, Webster Parish, LA, Ouachita County, AR, Nevada County, AR and Union County, AR.
Products
Columbia County, Products
Testing a home in Columbia County
No CDC figure names Columbia County; the nearest county with one, Garland County (94 miles away), reported 45.8% 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 Columbia County.
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
lüft plug-in radon and indoor air quality monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi, Bluetooth
- App only
First reading: Within 90 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Columbia County, Bordering counties
Counties bordering Columbia County
Calculated by Radon411- Radon levels in Webster Parish, LAEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 4 tests
- Radon levels in Union County, AREPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 3 tests
- Radon levels in Lafayette County, AREPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Claiborne Parish, LAEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Ouachita County, AREPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Nevada County, AREPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Columbia County, Cities and towns
Cities and towns in Columbia County
About 21,894 people live in Columbia County by the Census Bureau's estimate for July 1, 2025, 853 fewer than in 2020 (−3.7%). That works out to 29 people per square mile of land. Its largest town, Magnolia, has 10,660 residents, 48.7% of the total. Together its 5 incorporated places hold 59.2% of those residents; the other 40.8% live outside any of them. Reported testing is thin here: 2 tests over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Arkansas as a whole comes to 0.2.
From Magnolia to Emerson, CDC publishes no figure by town: each reads Columbia County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Magnolia | 10,660 | −4.3% | 48.7% |
| Waldo | 1,100 | −4.2% | 5.0% |
| Taylor | 560 | −2.4% | 2.6% |
| McNeil | 363 | −4.5% | 1.7% |
| Emerson | 282 | −3.1% | 1.3% |
5 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).
Columbia County, Homes
Homes in Columbia County
Of Columbia County's 11,032 homes, 69% are detached houses, against 70% across Arkansas; 17% are mobile homes. Half of its homes were built before 1981, close to Arkansas' 1987: 24% date from before 1960 and 20% from 2000 or later. 69% 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 | Columbia County | Arkansas |
|---|---|---|
| Housing units | 11,032 | 1,382,664 |
| Detached houses | 69% | 70% |
| In buildings of 5 or more | 7% | 10% |
| Mobile homes | 17% | 11% |
| Built before 1960 | 24% | 14% |
| Built since 2000 | 20% | 28% |
| Middle year built | 1981 | 1987 |
| Owner-occupied | 69% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.