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
Locations and reports
Radon Levels in Marshall County, Alabama
EPA puts Marshall County in Zone 2, its middle radon zone, and 15.1% of its 199 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
15.1%
6.8 pts below AL
- Marshall
- 15.1%
- Alabama
- 21.9%
199 tests, 2008 to 2017
Median result
1.3pCi/L
Below action level
- Marshall
- 1.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
199
10th of 27 by tests
- Marshall
- 199
- Madison
- 5,178
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Alabama
14 of 27
Middle half
- Marshall
- 15.1%
- Colbert
- 36.2%
By share, of 27 with 30+ tests
Read a result for Marshall County
Starts at Marshall County's median, 1.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.3 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. Marshall County's median reported result, 2008 to 2017.
The data
Marshall County, At a glance
Marshall County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Marshall County is a
USGS geologic potential: Moderate across 56% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Marshall County, 2008 to 2017, laboratory
Under 2 pCi/L: 69%2 to 4 pCi/L: 16%4 pCi/L and above: 15%
Of 199 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 138 | 69.3% |
| 2 to 4 pCi/L | 31 | 15.6% |
| 4 pCi/L and above | 30 | 15.1% |
What these figures count
These are the 199 tests reported to CDC for Marshall 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).
Marshall County, Compared
Marshall County radon figures, compared
Calculated by Radon411Marshall County's 199 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.3 pCi/L and a maximum of 20.7 pCi/L, and 15.1% reached 4 pCi/L. Alabama as a whole (65 Alabama counties, pooled) comes to 21.9%: 6.8 points higher than here.
Among its state's counties it ranks 14th 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, 138 tests (69.3%) came in under 2 pCi/L, against 54.3% statewide, and 31 tests (15.6%) fell between 2 and 4, against 23.8% statewide. CDC's ten-year totals for Marshall County went from 217 tests (2005 to 2014) to 199 (2008 to 2017), the share going from 12.4% to 15.1%.
EPA's 1993 zone map puts Marshall County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 56% of the county's land moderate radon potential.
Next door, the shares run from 11.4% in Cullman County to 25.2% in Madison County, with Morgan County, Blount County and DeKalb County below Marshall County.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Marshall County, Geology
The ground under Marshall County
PredictedUSGS's geologic map splits Marshall County: 56.2% of its land is moderate radon potential and 43.8% high. The map puts 55.8% of Marshall County in the area it calls Appalachian Plateau and 43.8% in Interior Low Plateaus. 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 |
|---|---|---|---|---|
| Appalachian Plateau | Limestone, sandstone, carbonaceous shale, coal | Moderate | 9 | 55.8% |
| Interior Low Plateaus | Mississippian carbonate rocks and shales. | High | 12 | 43.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Marshall County beside the ground around it
Marshall County has more high-potential ground than Alabama as a whole: 43.8% of its land against 14.3%. Of the 7 counties that border it, 3 have more high-potential ground, Madison County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Marshall County, Local resources
Radon testing and mitigation in Marshall 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
Marshall County, Questions
Questions about radon in Marshall County
Are radon levels high in Marshall County?
Over the 2008 to 2017 laboratory totals, 15.1% of the radon tests reported to CDC for Marshall County, Alabama were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.3 pCi/L. Of 27 Alabama counties with 30 or more tests for the same period, 13 reported a higher share; pooled, the state comes to 21.9%.
Which counties border Marshall County?
Marshall County borders 7 counties: Blount County, Madison County, Etowah County, Jackson County, Morgan County, Cullman County and DeKalb County.
Products
Marshall County, Products
Testing a home in Marshall County
In Marshall County, 15.1% of 199 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 21.9% pooled across Alabama. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Marshall County; a long-term test tells the year-round average.
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
Monitor
EcoQube Wi-Fi continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi
- App only
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
Marshall County, Bordering counties
Counties bordering Marshall County
Calculated by Radon411- Radon levels in Madison CountyEPA zone 1
25.2%at or above 4 pCi/L
Median 1.9 pCi/L · 5,178 tests · 10.1 points above Marshall County
- Radon levels in Etowah CountyEPA zone 2
19.6%at or above 4 pCi/L
Median 1.4 pCi/L · 56 tests · 4.5 points above Marshall County
- Radon levels in Jackson CountyEPA zone 1
17.5%at or above 4 pCi/L
Median 1.5 pCi/L · 223 tests · 2.4 points above Marshall County
- Radon levels in Morgan CountyEPA zone 1
14.6%at or above 4 pCi/L
Median 1.4 pCi/L · 453 tests · 0.5 points below Marshall County
- Radon levels in Blount CountyEPA zone 2
13.6%at or above 4 pCi/L
Median 2.0 pCi/L · 44 tests · 1.5 points below Marshall County
- Radon levels in DeKalb CountyEPA zone 2
13.2%at or above 4 pCi/L
Median 0.9 pCi/L · 68 tests · 1.9 points below Marshall County
- Radon levels in Cullman CountyEPA zone 2
11.4%at or above 4 pCi/L
Median 1.5 pCi/L · 79 tests · 3.7 points below Marshall County
Marshall County, Cities and towns
Cities and towns in Marshall County
Marshall County is growing: the Census Bureau puts it at 103,537 residents on July 1, 2025, up 6.0% from 97,696 in 2020. That works out to 183 people per square mile of land. Its largest town, Albertville, has 23,710 residents, 22.9% of the total. CDC's 199 reported tests for 2008 to 2017 work out to 1.9 per 1,000 residents (2025 estimate), close to Alabama's 2.4.
From Albertville to Union Grove, CDC publishes no figure by town: each reads Marshall County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Albertville | 23,710 | +5.8% | 22.9% |
| Boazextends beyond Marshall County | 10,619 | +5.0% | Counted whole |
| Guntersville | 9,394 | +9.4% | 9.1% |
| Arabextends beyond Marshall County | 9,061 | +7.3% | Counted whole |
| Sardis Cityextends beyond Marshall County | 1,787 | −1.7% | Counted whole |
| Grant | 1,078 | +3.6% | 1.0% |
| Douglas | 796 | +5.0% | 0.8% |
| Union Grove | 76 | +5.6% | Under 0.1% |
8 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 Marshall County is counted whole, so it has no share.
Marshall County, Homes
Homes in Marshall County
Marshall County is a place of houses on their own lots: 77% of its 41,531 homes are detached single-family houses, against 69% across Alabama. Half of its homes were built before 1985, close to Alabama's 1985: 14% date from before 1960 and 24% from 2000 or later. Owners live in 75% of the occupied homes (Alabama: 70%), so for most households a test and a fix are their own to order.
| Homes | Marshall County | Alabama |
|---|---|---|
| Housing units | 41,531 | 2,316,192 |
| Detached houses | 77% | 69% |
| In buildings of 5 or more | 4% | 12% |
| Mobile homes | 14% | 13% |
| Built before 1960 | 14% | 16% |
| Built since 2000 | 24% | 27% |
| Middle year built | 1985 | 1985 |
| Owner-occupied | 75% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.