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 Monroe County, Arkansas
EPA puts Monroe 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
6.8%
Pulaski County, 63 miles
- Pulaski
- 6.8%
- Arkansas
- 22.7%
Share at 4+ pCi/L, 103 tests, 2007 to 2016
Ground above low
None
21.3 pts below Arkansas
- Monroe
- 0.0%
- Arkansas
- 21.3%
Share of land USGS rates moderate or high potential
Tests reported
2
Too few for a share
- Monroe
- 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 Monroe 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
Monroe County, At a glance
Monroe 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 Monroe County, 2008 to 2017, laboratory
CDC holds 2 reported tests for Monroe County over the 2008 to 2017 laboratory totals, with a median of 3.9 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Monroe County beside the counties around it is how this page reads it.
What these figures count
Only 2 tests were reported to CDC for Monroe 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).
Monroe County, Compared
Monroe County radon figures, compared
Calculated by Radon411CDC's largest figure for Monroe County rests on 2 tests over the 2008 to 2017 laboratory totals, 1 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 6.8 pCi/L, with a middle value of 3.9 pCi/L.
The nearest counties with a figure are Pulaski County (63 miles away) at 6.8%, Saline County (84 miles away) at 31.9% and Garland County (111 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 Monroe 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.
Monroe County, Geology
The ground under Monroe County
PredictedUSGS's geologic map puts all of Monroe County's mapped land in one class: low radon potential. All of it lies in the area the map calls Mississippi Alluvial Plain, to which USGS gives 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 |
|---|---|---|---|---|
| Mississippi Alluvial Plain | Alluvial sand, silt, gravel, and clay. | Low | 8 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Monroe County beside the ground around it
Across Arkansas 21.3% of the land is rated moderate; none of Monroe County's is. Of the 6 counties that border it, 3 have more moderate-potential ground, St. Francis County the most at 10.3%.
The map rates the ground, not the air in any home.
Local help
Monroe County, Local resources
Radon testing and mitigation in Monroe 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
Monroe County, Questions
Questions about radon in Monroe County
Are radon levels high in Monroe County?
Over the 2008 to 2017 laboratory totals, 50.0% of the radon tests reported to CDC for Monroe County, Arkansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.9 pCi/L. Of the 5 nearest counties with a figure, within 207 miles, the share of tests at or above 4 pCi/L runs from 6.8% to 45.8%.
Which counties border Monroe County?
Monroe County borders 6 counties: Prairie County, Lee County, Arkansas County, Phillips County, Woodruff County and St. Francis County.
Products
Monroe County, Products
Testing a home in Monroe County
No CDC figure names Monroe County; the nearest county with one, Pulaski County (63 miles away), reported 6.8% 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 Monroe 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
MonitorForensics Detectors
FD-65-RADON rechargeable radon detector with a color screen
- 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
Monroe County, Bordering counties
Counties bordering Monroe County
Calculated by Radon411- Radon levels in Prairie CountyEPA zone 3
100.0%at or above 4 pCi/L
Median 4.5 pCi/L · 1 test
- Radon levels in Arkansas CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.3 pCi/L · 1 test
- Radon levels in Phillips CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
- Radon levels in Lee CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Woodruff CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in St. Francis CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Monroe County, Cities and towns
Cities and towns in Monroe County
Monroe County has been losing residents: from 6,769 in 2020 to 6,244 on July 1, 2025, a fall of 7.8% by the Census Bureau's estimates. That works out to 10 people per square mile of land. Its largest town, Brinkley, has 2,468 residents, 39.5% of the total. Together its 5 incorporated places hold 70.9% of those residents; the other 29.1% live outside any of them. CDC's 2 reported tests for 2008 to 2017 work out to 0.3 per 1,000 residents (2025 estimate), close to Arkansas' 0.2.
From Brinkley to Fargo, CDC publishes no figure by town: each reads Monroe County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Brinkley | 2,468 | −8.4% | 39.5% |
| Clarendon | 1,394 | −7.9% | 22.3% |
| Holly Grove | 433 | −8.1% | 6.9% |
| Roe | 74 | −6.3% | 1.2% |
| Fargo | 58 | −4.9% | 0.9% |
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).
Monroe County, Homes
Homes in Monroe County
Of Monroe County's 3,843 homes, 71% are detached houses, against 70% across Arkansas; 16% are mobile homes. The homes are older than Arkansas' as a whole: half were built before 1976 (1987 for Arkansas), and 21% date from before 1960. 66% 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 | Monroe County | Arkansas |
|---|---|---|
| Housing units | 3,843 | 1,382,664 |
| Detached houses | 71% | 70% |
| In buildings of 5 or more | 5% | 10% |
| Mobile homes | 16% | 11% |
| Built before 1960 | 21% | 14% |
| Built since 2000 | 15% | 28% |
| Middle year built | 1976 | 1987 |
| Owner-occupied | 66% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.