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 Calhoun County, Arkansas
EPA puts Calhoun County in Zone 3, its lowest radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Nearest county
31.9%
Saline County, 76 miles
- Saline
- 31.9%
- Arkansas
- 22.7%
Share at 4+ pCi/L, 47 tests, 2007 to 2016
Ground above low
None
21.3 pts below Arkansas
- Calhoun
- 0.0%
- Arkansas
- 21.3%
Share of land USGS rates moderate or high potential
Tests reported
0
None published
A home here needs its own test
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 Calhoun 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
Calhoun County, At a glance
Calhoun 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
No CDC test figures here
CDC has published no radon test figures for Calhoun County. Saline County, 76 miles away, is the nearest county with a figure over the 2007 to 2016 laboratory totals.
Calhoun County, Compared
Calhoun County radon figures, compared
Calculated by Radon411No CDC figure names Calhoun County, in any year or ten-year total; over the 2007 to 2016 laboratory totals, the agency's counts reach 60 Arkansas counties without it. Pooled across 60 Arkansas counties, 22.7% of reported tests reached that level; across every county in the country with a figure, 35.8%.
The nearest counties with a figure are Saline County (76 miles away) at 31.9%, Garland County (79 miles away) at 45.8% and Pulaski County (84 miles away) at 6.8%. 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 Calhoun 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.
Calhoun County, Geology
The ground under Calhoun County
PredictedUSGS's geologic map puts all of Calhoun 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Calhoun County beside the ground around it
Across Arkansas 21.3% of the land is rated moderate; none of Calhoun County's is. None of the 5 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Calhoun County, Local resources
Radon testing and mitigation in Calhoun 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
Calhoun County, Questions
Questions about radon in Calhoun County
Are radon levels high in Calhoun County?
No CDC testing statistics are published here for Calhoun County, Arkansas yet. Of the 5 nearest counties with a figure, within 216 miles, the share of tests at or above 4 pCi/L runs from 6.8% to 45.8%.
Which counties border Calhoun County?
Calhoun County borders 5 counties: Bradley County, Ouachita County, Union County, Cleveland County and Dallas County.
Products
Calhoun County, Products
Testing a home in Calhoun County
No CDC figure names Calhoun County; the nearest county with one, Saline County (76 miles away), reported 31.9% 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 Calhoun 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
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
Calhoun County, Bordering counties
Counties bordering Calhoun County
Calculated by Radon411- Radon levels in Bradley CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
- Radon levels in Union CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 3 tests
- Radon levels in Cleveland CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 3 tests
- Radon levels in Dallas CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.2 pCi/L · 1 test
- Radon levels in Ouachita CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Calhoun County, Cities and towns
Cities and towns in Calhoun County
About 4,632 people live in Calhoun County by the Census Bureau's estimate for July 1, 2025, 106 fewer than in 2020 (−2.2%). Spread over its land, that is 7.4 people to the square mile. Its largest town, Hampton, has 1,145 residents, 24.7% of the total. Together its 4 incorporated places hold 37.3% of those residents; the other 62.7% live outside any of them. CDC publishes no radon test count for Calhoun County; across Arkansas its counts for 2007 to 2016 come to 0.2 tests for every 1,000 residents (2025 estimate).
From Hampton to Tinsman, CDC publishes no figure by town: each reads Calhoun County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Hampton | 1,145 | −3.5% | 24.7% |
| Thornton | 325 | −3.3% | 7.0% |
| Harrell | 206 | −1.9% | 4.4% |
| Tinsman | 51 | −3.8% | 1.1% |
4 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).
Calhoun County, Homes
Homes in Calhoun County
Of Calhoun County's 2,468 homes, 68% are detached houses, against 70% across Arkansas; 31% are mobile homes. Half of its homes were built before 1980, close to Arkansas' 1987: 15% date from before 1960 and 24% from 2000 or later. Owners live in 86% of the occupied homes (Arkansas: 66%), so for most households a test and a fix are their own to order.
| Homes | Calhoun County | Arkansas |
|---|---|---|
| Housing units | 2,468 | 1,382,664 |
| Detached houses | 68% | 70% |
| In buildings of 5 or more | 1% | 10% |
| Mobile homes | 31% | 11% |
| Built before 1960 | 15% | 14% |
| Built since 2000 | 24% | 28% |
| Middle year built | 1980 | 1987 |
| Owner-occupied | 86% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.