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
Locations and reports
Radon Levels in Clay County, Alabama
EPA puts Clay County in Zone 1, its highest radon zone, and 17.9% of its 39 reported radon tests (2008 to 2017, laboratory totals) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
17.9%
4.0 pts below AL
- Clay
- 17.9%
- Alabama
- 21.9%
39 tests, 2008 to 2017
Median result
0.9pCi/L
Below action level
- Clay
- 0.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
39
24th of 27 by tests
- Clay
- 39
- Madison
- 5,178
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Alabama
10 of 27
Middle half
- Clay
- 17.9%
- Colbert
- 36.2%
By share, of 27 with 30+ tests
Read a result for Clay County
Starts at Clay County's median, 0.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.9 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Clay County's median reported result, 2008 to 2017.
The data
Clay County, At a glance
Clay County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Clay County in
USGS geologic potential: High across 70% 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
Under 2 pCi/L: 69%2 to 4 pCi/L: 13%4 pCi/L and above: 18%
Of 39 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 27 | 69.2% |
| 2 to 4 pCi/L | 5 | 12.8% |
| 4 pCi/L and above | 7 | 17.9% |
What these figures count
These are the 39 tests reported to CDC for Clay County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not 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 Radon411Clay County's 39 reported tests over the 2008 to 2017 laboratory totals had a middle value of 0.9 pCi/L and a maximum of 29.0 pCi/L, and 17.9% reached 4 pCi/L. Alabama as a whole (65 Alabama counties, pooled) comes to 21.9%: 4.0 points higher than here.
Among its state's counties it ranks 10th of 27 Alabama counties with 30 or more tests for the same period. Statewide for the same period, Colbert County reported the highest share (36.2%) and Baldwin County the lowest (0.0%).
Below the action level, 27 tests (69.2%) came in under 2 pCi/L, against 54.3% statewide, and 5 tests (12.8%) fell between 2 and 4, against 23.8% statewide. CDC's ten-year totals for Clay County went from 56 tests (2005 to 2014) to 39 (2008 to 2017), the share going from 17.9% to 17.9%.
EPA's 1993 zone map puts Clay County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 70% of the county's land high radon potential.
Next door, the shares run from 18.5% in Talladega County to 18.8% in Cleburne County.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Clay County, Geology
The ground under Clay County
PredictedUSGS's geologic map splits Clay County: 69.6% of its land is high radon potential and 30.4% moderate. The map puts 69.6% of Clay County in the area it calls Northern Piedmont and 30.4% in Northern Piedmont. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Northern Piedmont | Schist, metagraywake, phyllite, quartz diorite gneiss, amphibolite gneiss, quartz monzonite. | High | 12 | 69.6% |
| Northern Piedmont | Graphitic schists, phyllites, and felsic gneiss. | Moderate | 9 | 30.4% |
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
Clay County has more high-potential ground than Alabama as a whole: 69.6% of its land against 14.3%. Of the 5 counties that border it, 1 has more high-potential ground, Cleburne County the most at 88.1%.
The map rates the ground, not the air in any home.
Local help
Clay County, Local resources
Radon testing and mitigation in Clay County
- Alabama Radon ProgramAlabama Radon Program, run by Alabama Department of Public Health, answers questions about testing, mitigation and the rules in Alabama.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 Alabama directoryNo professionals are listed in Alabama yet. The state program can point you to registered testers and mitigators.
What Alabama's program says
- Phone
- (334) 290-6244
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, 17.9% of the radon tests reported to CDC for Clay County, Alabama were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Of 27 Alabama counties with 30 or more tests for the same period, 9 reported a higher share; pooled, the state comes to 21.9%.
Which counties border Clay County?
Clay County borders 5 counties: Talladega County, Randolph County, Tallapoosa County, Cleburne County and Coosa County.
Products
Clay County, Products
Testing a home in Clay County
In Clay County, 17.9% of 39 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 21.9% pooled across Alabama. In Zone 1 the year-round level in Clay County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
Monitor
Hello Radon C battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Clay County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Clay County
Explore
Clay County, Bordering counties
Counties bordering Clay County
Calculated by Radon411- Radon levels in Randolph CountyEPA zone 2
40.0%at or above 4 pCi/L
Median 3.7 pCi/L · 15 tests · 22.1 points above Clay County
- Radon levels in Cleburne CountyEPA zone 1
18.8%at or above 4 pCi/L
Median 1.5 pCi/L · 69 tests · 0.9 points above Clay County
- Radon levels in Talladega CountyEPA zone 1
18.5%at or above 4 pCi/L
Median 1.6 pCi/L · 124 tests · 0.6 points above Clay County
- Radon levels in Tallapoosa CountyEPA zone 3
6.3%at or above 4 pCi/L
Median 0.9 pCi/L · 16 tests · 11.6 points below Clay County
- Radon levels in Coosa CountyEPA zone 1
0.0%at or above 4 pCi/L
Median 1.4 pCi/L · 9 tests · 17.9 points below Clay County
Clay County, Cities and towns
Cities and towns in Clay County
Clay County's population has barely moved since 2020: 14,207 residents on July 1, 2025 against 14,216 then, by the Census Bureau's estimates. That works out to 24 people per square mile of land. No town dominates: Lineville, the largest, has 2,473 residents, 17.4% of the total. Together its 2 incorporated places hold 31.1% of those residents; the other 68.9% live outside any of them. CDC's 39 reported tests for 2008 to 2017 work out to 2.7 per 1,000 residents (2025 estimate), close to Alabama's 2.4.
From Lineville to Ashland, CDC publishes no figure by town: each reads Clay County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Lineville | 2,473 | −0.1% | 17.4% |
| Ashland | 1,952 | −1.6% | 13.7% |
2 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
Of Clay County's 7,072 homes, 65% are detached houses, against 69% across Alabama; 25% are mobile homes. Half of its homes were built before 1983, close to Alabama's 1985: 22% date from before 1960 and 22% from 2000 or later. Owners live in 78% of the occupied homes (Alabama: 70%), so for most households a test and a fix are their own to order.
| Homes | Clay County | Alabama |
|---|---|---|
| Housing units | 7,072 | 2,316,192 |
| Detached houses | 65% | 69% |
| In buildings of 5 or more | 2% | 12% |
| Mobile homes | 25% | 13% |
| Built before 1960 | 22% | 16% |
| Built since 2000 | 22% | 27% |
| Middle year built | 1983 | 1985 |
| Owner-occupied | 78% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.