Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Marengo County, Alabama
EPA puts Marengo 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
17.1%
Autauga County, 70 miles
- Autauga
- 17.1%
- Alabama
- 21.9%
Share at 4+ pCi/L, 35 tests, 2008 to 2017
Ground above low
39.8%
24.9 pts below Alabama
- Marengo
- 39.8%
- Alabama
- 64.7%
Share of land USGS rates moderate or high potential
Tests reported
2
Too few for a share
- Marengo
- 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 Marengo 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
Marengo County, At a glance
Marengo County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 60% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Marengo County, 2008 to 2017, laboratory
CDC holds 2 reported tests for Marengo County over the 2008 to 2017 laboratory totals, with a median of 9.3 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Marengo County beside the counties around it is how this page reads it.
What these figures count
Only 2 tests were reported to CDC for Marengo 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).
Marengo County, Compared
Marengo County radon figures, compared
Calculated by Radon411CDC's largest figure for Marengo 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 18.2 pCi/L, with a middle value of 9.3 pCi/L.
The nearest counties with a figure are Autauga County (70 miles away) at 17.1%, Tuscaloosa County (73 miles away) at 8.5% and Montgomery County (93 miles away) at 9.7%. Pooled across 65 Alabama counties, 21.9% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Colbert County reported the highest share (36.2%) and Baldwin County the lowest (0.0%). EPA's 1993 map puts Marengo County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 60% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Marengo County, Geology
The ground under Marengo County
PredictedUSGS's geologic map splits Marengo County: 60.2% of its land is low radon potential and 39.8% moderate. The map puts 60.2% of Marengo County in the area it calls Coastal Plain and 39.8% in Inner Coastal Plain. USGS gives the first a radon index of 7, in the low band (5 to 8), and the second 10, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Coastal Plain | Marly sandy clay, chalk, and glauconitic sands. | Low | 7 | 60.2% |
| Inner Coastal Plain | Marly sandy clay, chalk, and glauconitic sands. | Moderate | 10 | 39.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Marengo County beside the ground around it
Across Alabama 14.3% of the land is rated high; none of Marengo County's is. Of the 8 counties that border it, 5 have more moderate-potential ground, Greene County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Marengo County, Local resources
Radon testing and mitigation in Marengo 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
Marengo County, Questions
Questions about radon in Marengo County
Are radon levels high in Marengo County?
Over the 2008 to 2017 laboratory totals, 50.0% of the radon tests reported to CDC for Marengo County, Alabama were at or above 4 pCi/L, and the median reported pre-mitigation result was 9.3 pCi/L. Of the 8 nearest counties with a figure, within 105 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 22.2%.
Which counties border Marengo County?
Marengo County borders 8 counties: Wilcox County, Hale County, Perry County, Choctaw County, Dallas County, Sumter County, Greene County and Clarke County.
Products
Marengo County, Products
Testing a home in Marengo County
No CDC figure names Marengo County; the nearest county with one, Autauga County (70 miles away), reported 17.1% of its tests at or above 4 pCi/L over the 2008 to 2017 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 Marengo 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
Monitor
RadonScan USB-powered radon monitor with a color screen
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Marengo County, Bordering counties
Counties bordering Marengo County
Calculated by Radon411- Radon levels in Hale CountyEPA zone 2
50.0%at or above 4 pCi/L
Median 3.9 pCi/L · 10 tests
- Radon levels in Perry CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 3.2 pCi/L · 1 test
- Radon levels in Choctaw CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 1 test
- Radon levels in Dallas CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 0.5 pCi/L · 6 tests
- Radon levels in Sumter CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 2.3 pCi/L · 2 tests
- Radon levels in Greene CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 0.2 pCi/L · 1 test
- Radon levels in Clarke CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.4 pCi/L · 1 test
- Radon levels in Wilcox CountyEPA zone 3
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Marengo County, Cities and towns
Cities and towns in Marengo County
About 18,311 people live in Marengo County by the Census Bureau's estimate for July 1, 2025, 955 fewer than in 2020 (−5.0%). That works out to 19 people per square mile of land. Its largest town, Demopolis, has 6,641 residents, 36.3% of the total. Together its 8 incorporated places hold 50.8% of those residents; the other 49.2% live outside any of them. Reported testing is thin here: 2 tests over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Alabama as a whole comes to 2.4.
From Demopolis to Dayton, CDC publishes no figure by town: each reads Marengo County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Demopolis | 6,641 | −7.0% | 36.3% |
| Linden | 1,801 | −6.8% | 9.8% |
| Thomaston | 306 | −6.1% | 1.7% |
| Sweet Water | 214 | −6.1% | 1.2% |
| Providence | 161 | −3.6% | 0.9% |
| Faunsdale | 82 | −4.7% | 0.4% |
| Myrtlewood | 66 | −7.0% | 0.4% |
| Dayton | 24 | −7.7% | 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).
Marengo County, Homes
Homes in Marengo County
Of Marengo County's 9,837 homes, 57% are detached houses, against 69% across Alabama; 29% are mobile homes. Half of its homes were built before 1983, close to Alabama's 1985: 16% date from before 1960 and 17% from 2000 or later. 69% 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 | Marengo County | Alabama |
|---|---|---|
| Housing units | 9,837 | 2,316,192 |
| Detached houses | 57% | 69% |
| In buildings of 5 or more | 6% | 12% |
| Mobile homes | 29% | 13% |
| Built before 1960 | 16% | 16% |
| Built since 2000 | 17% | 27% |
| Middle year built | 1983 | 1985 |
| Owner-occupied | 69% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.