Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Clay County, Arkansas
EPA puts Clay 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
Highest bordering
16.7%
Butler County
- Butler
- 16.7%
1 of 5 neighbours have 30+ tests, 2007 to 2016
Nearest county
6.8%
Pulaski County, 153 miles
- Pulaski
- 6.8%
- Arkansas
- 22.7%
Share at 4+ pCi/L, 103 tests, 2007 to 2016
Ground above low
19.2%
2.1 pts below Arkansas
- Clay
- 19.2%
- Arkansas
- 21.3%
Share of land USGS rates moderate or high potential
Tests reported
2
Too few for a share
- Clay
- 2
- Needed
- 30
2007 to 2016, 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 Clay 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
Clay County, At a glance
Clay County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 81% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Clay County, 2008 to 2017, laboratory
CDC holds 1 reported test for Clay County over the 2008 to 2017 laboratory totals, a result of 0.2 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Clay County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Clay 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).
Clay County, Compared
Clay County radon figures, compared
Calculated by Radon411CDC's largest figure for Clay County rests on 2 tests over the 2007 to 2016 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 2.6 pCi/L, with a middle value of 1.4 pCi/L.
Butler County, MO, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 16.7% of its tests at or above 4 pCi/L. Farther out, Pulaski County (153 miles away) at 6.8%, Saline County (174 miles away) at 31.9% and Garland County (197 miles away) at 45.8% 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 Clay County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 81% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Clay County, Geology
The ground under Clay County
PredictedMost of the ground under Clay County is one class on USGS's geologic map: 80.8% of its land is low radon potential, with 19.2% moderate. The map puts 79.9% of Clay County in the area it calls Mississippi Alluvial Plain and 19.2% in Crowley's Ridge, with one smaller area beside them. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Mississippi Alluvial Plain | Alluvial sand, silt, gravel, and clay. | Low | 8 | 79.9% |
| Crowley's Ridge | Loess. | Moderate | 9 | 19.2% |
| Coastal Plains Province | Tertiary-Quaternary sandstone, shale, and alluvium. | Low | 5 | 0.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Clay County beside the ground around it
On moderate-potential ground Clay County is close to Arkansas as a whole: 19.2% of its land against 21.3%. Of the 5 counties that border it, 4 have more moderate-potential ground, Ripley County, MO the most at 90.3%.
The map rates the ground, not the air in any home.
Local help
Clay County, Local resources
Radon testing and mitigation in Clay 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
Clay County, Questions
Questions about radon in Clay County
Are radon levels high in Clay County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Clay County, Arkansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.2 pCi/L. Butler County, MO, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 16.7% of its tests at or above 4 pCi/L.
Which counties border Clay County?
Clay County borders 5 counties: Greene County, AR, Dunklin County, MO, Butler County, MO, Ripley County, MO and Randolph County, AR.
Products
Clay County, Products
Testing a home in Clay County
No CDC figure names Clay County; the nearest county with one, Pulaski County (153 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 Clay 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
MonitorAEGTEST
HOUND-3786 rechargeable radon monitor with a 3.5-inch color screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Ion chamber
First reading: Within 10 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Clay County, Bordering counties
Counties bordering Clay County
Calculated by Radon411- Radon levels in Randolph County, AREPA zone 2
100.0%at or above 4 pCi/L
Median 4.9 pCi/L · 1 test
- Radon levels in Ripley County, MOEPA zone 2
44.4%at or above 4 pCi/L
Median 3.3 pCi/L · 9 tests
- Radon levels in Butler County, MOEPA zone 3
16.7%at or above 4 pCi/L
Median 1.6 pCi/L · 30 tests
- Radon levels in Dunklin County, MOEPA zone 3
7.1%at or above 4 pCi/L
Median 1.3 pCi/L · 14 tests
- Radon levels in Greene County, AREPA zone 3
0.0%at or above 4 pCi/L
Median 1.4 pCi/L · 3 tests
Clay County, Cities and towns
Cities and towns in Clay County
About 14,052 people live in Clay County by the Census Bureau's estimate for July 1, 2025, 483 fewer than in 2020 (−3.3%). That works out to 22 people per square mile of land. Its largest town, Piggott, has 3,508 residents, 25.0% of the total. Together its 12 incorporated places hold 67.8% of those residents; the other 32.2% live outside any of them. Reported testing is thin here: 2 tests over 2007 to 2016, or 0.1 for every 1,000 residents (2025 estimate), where Arkansas as a whole comes to 0.2.
From Piggott to Datto, CDC publishes no figure by town: each reads Clay County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Piggott | 3,508 | −3.3% | 25.0% |
| Corning | 3,065 | −4.8% | 21.8% |
| Rector | 1,789 | −3.0% | 12.7% |
| St. Francis | 211 | −2.8% | 1.5% |
| Pollard | 186 | −4.1% | 1.3% |
| Greenway | 171 | −1.7% | 1.2% |
| Knobel | 143 | −2.7% | 1.0% |
| McDougal | 127 | −3.8% | 0.9% |
| Peach Orchard | 103 | −1.9% | 0.7% |
| Success | 96 | −2.0% | 0.7% |
| Nimmons | 64 | −4.5% | 0.5% |
| Datto | 62 | −4.6% | 0.4% |
12 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).
Clay County, Homes
Homes in Clay County
Clay County is a place of houses on their own lots: 81% of its 7,499 homes are detached single-family houses, against 70% across Arkansas. The homes are older than Arkansas' as a whole: half were built before 1973 (1987 for Arkansas), and 25% date from before 1960. 71% 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 | Clay County | Arkansas |
|---|---|---|
| Housing units | 7,499 | 1,382,664 |
| Detached houses | 81% | 70% |
| In buildings of 5 or more | 3% | 10% |
| Mobile homes | 12% | 11% |
| Built before 1960 | 25% | 14% |
| Built since 2000 | 11% | 28% |
| Middle year built | 1973 | 1987 |
| Owner-occupied | 71% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.