Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Calhoun County, Alabama
EPA puts Calhoun County in Zone 1, its highest radon zone, and 18.9% of its 238 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
18.9%
3.0 pts below AL
- Calhoun
- 18.9%
- Alabama
- 21.9%
238 tests, 2008 to 2017
Median result
1.4pCi/L
Below action level
- Calhoun
- 1.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
238
8th of 27 by tests
- Calhoun
- 238
- 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
6 of 27
Top quarter
- Calhoun
- 18.9%
- Colbert
- 36.2%
By share, of 27 with 30+ tests
Read a result for Calhoun County
Starts at Calhoun County's median, 1.4 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.4 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. Calhoun County's median reported result, 2008 to 2017.
The data
Calhoun County, At a glance
Calhoun County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Calhoun County in
USGS geologic potential: Moderate across 65% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Calhoun County, 2008 to 2017, laboratory
Under 2 pCi/L: 60%2 to 4 pCi/L: 21%4 pCi/L and above: 19%
Of 238 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 142 | 59.7% |
| 2 to 4 pCi/L | 51 | 21.4% |
| 4 pCi/L and above | 45 | 18.9% |
What these figures count
These are the 238 tests reported to CDC for Calhoun 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).
Calhoun County, Compared
Calhoun County radon figures, compared
Calculated by Radon411Calhoun County's 238 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.4 pCi/L and a maximum of 26.0 pCi/L, and 18.9% reached 4 pCi/L. Alabama as a whole (65 Alabama counties, pooled) comes to 21.9%: 3.0 points higher than here.
Among its state's counties it ranks 6th 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, 142 tests (59.7%) came in under 2 pCi/L, against 54.3% statewide, and 51 tests (21.4%) fell between 2 and 4, against 23.8% statewide. CDC's ten-year totals for Calhoun County went from 237 tests (2005 to 2014) to 238 (2008 to 2017), the share going from 20.3% to 18.9%.
EPA's 1993 zone map puts Calhoun County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 65% of the county's land moderate radon potential.
Next door, the shares run from 14.0% in St. Clair County to 19.6% in Etowah County, with Cleburne County, Talladega County and St. Clair County below Calhoun County.
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 splits Calhoun County: 64.9% of its land is moderate radon potential and 35.1% high. The map puts 64.9% of Calhoun County in the area it calls Valley and Ridge and 35.1% in Northern Piedmont. USGS gives the first a radon index of 9, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Valley and Ridge | Chattanooga black shale, Cambrian-Ordovician limestone and sandstone. | Moderate | 9 | 64.9% |
| Northern Piedmont | Schist, metagraywake, phyllite, quartz diorite gneiss, amphibolite gneiss, quartz monzonite. | High | 12 | 35.1% |
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
Calhoun County has more high-potential ground than Alabama as a whole: 35.1% of its land against 14.3%. Of the 5 counties that border it, 2 have more high-potential ground, Cleburne County the most at 88.1%.
The map rates the ground, not the air in any home.
Local help
Calhoun County, Local resources
Radon testing and mitigation in Calhoun 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
Calhoun County, Questions
Questions about radon in Calhoun County
Are radon levels high in Calhoun County?
Over the 2008 to 2017 laboratory totals, 18.9% of the radon tests reported to CDC for Calhoun County, Alabama were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.4 pCi/L. Of 27 Alabama counties with 30 or more tests for the same period, 5 reported a higher share; pooled, the state comes to 21.9%.
Which counties border Calhoun County?
Calhoun County borders 5 counties: Cleburne County, Etowah County, Talladega County, St. Clair County and Cherokee County.
Products
Calhoun County, Products
Testing a home in Calhoun County
In Calhoun County, 18.9% of 238 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 Calhoun 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
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
Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Calhoun County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Calhoun County
Explore
Calhoun County, Bordering counties
Counties bordering Calhoun County
Calculated by Radon411- Radon levels in Etowah CountyEPA zone 2
19.6%at or above 4 pCi/L
Median 1.4 pCi/L · 56 tests · 0.7 points above Calhoun County
- Radon levels in Cleburne CountyEPA zone 1
18.8%at or above 4 pCi/L
Median 1.5 pCi/L · 69 tests · 0.1 points below Calhoun County
- Radon levels in Talladega CountyEPA zone 1
18.5%at or above 4 pCi/L
Median 1.6 pCi/L · 124 tests · 0.4 points below Calhoun County
- Radon levels in St. Clair CountyEPA zone 2
14.0%at or above 4 pCi/L
Median 1.2 pCi/L · 93 tests · 4.9 points below Calhoun County
- Radon levels in Cherokee CountyEPA zone 2
10.0%at or above 4 pCi/L
Median 1.5 pCi/L · 10 tests · 8.9 points below Calhoun County
Calhoun County, Cities and towns
Cities and towns in Calhoun County
Calhoun County's population has barely moved since 2020: 115,834 residents on July 1, 2025 against 116,238 then, by the Census Bureau's estimates. That works out to 191 people per square mile of land. Oxford, the largest place on its list (22,199 residents in all), extends beyond Calhoun County, so no share of the total is worked out for it. CDC's 238 reported tests for 2008 to 2017 work out to 2.1 per 1,000 residents (2025 estimate), close to Alabama's 2.4.
From Oxford to Hobson City, CDC publishes no figure by town: each reads Calhoun County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Oxfordextends beyond Calhoun County | 22,199 | +0.3% | Counted whole |
| Anniston | 20,930 | −2.7% | 18.1% |
| Jacksonville | 14,400 | +0.7% | 12.4% |
| Southsideextends beyond Calhoun County | 9,718 | +2.6% | Counted whole |
| Glencoeextends beyond Calhoun County | 5,426 | +0.8% | Counted whole |
| Piedmontextends beyond Calhoun County | 4,696 | −2.1% | Counted whole |
| Weaver | 3,289 | −1.4% | 2.8% |
| Ohatchee | 1,188 | +3.1% | 1.0% |
| Hobson City | 742 | −2.5% | 0.6% |
9 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). A place that extends beyond Calhoun County is counted whole, so it has no share.
Calhoun County, Homes
Homes in Calhoun County
Of Calhoun County's 53,271 homes, 72% are detached houses, against 69% across Alabama; 15% are mobile homes. Half of its homes were built before 1979, close to Alabama's 1985: 23% date from before 1960 and 19% from 2000 or later. 70% of occupied homes are lived in by their owner (Alabama: 70%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Calhoun County | Alabama |
|---|---|---|
| Housing units | 53,271 | 2,316,192 |
| Detached houses | 72% | 69% |
| In buildings of 5 or more | 7% | 12% |
| Mobile homes | 15% | 13% |
| Built before 1960 | 23% | 16% |
| Built since 2000 | 19% | 27% |
| Middle year built | 1979 | 1985 |
| Owner-occupied | 70% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.