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 Mobile County, Alabama
EPA puts Mobile County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 3.8% of 52 (2008 to 2017, laboratory totals) reached 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
3.8%
18.1 pts below AL
- Mobile
- 3.8%
- Alabama
- 21.9%
52 tests, 2008 to 2017
Median result
0.5pCi/L
Below action level
- Mobile
- 0.5 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
52
22nd of 27 by tests
- Mobile
- 52
- Madison
- 5,178
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in Alabama
26 of 27
Lowest quarter
- Mobile
- 3.8%
- Colbert
- 36.2%
By share, of 27 with 30+ tests
Read a result for Mobile County
Starts at Mobile County's median, 0.5 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.5 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. Mobile County's median reported result, 2008 to 2017.
The data
Mobile County, At a glance
Mobile County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 98% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Mobile County, 2008 to 2017, laboratory
Under 2 pCi/L: 94%2 to 4 pCi/L: 2%4 pCi/L and above: 4%
Of 52 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 49 | 94.2% |
| 2 to 4 pCi/L | 1 | 1.9% |
| 4 pCi/L and above | 2 | 3.8% |
What these figures count
These are the 52 tests reported to CDC for Mobile 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).
Mobile County, Compared
Mobile County radon figures, compared
Calculated by Radon411Only 2 of 52 radon tests reported for Mobile County over the 2008 to 2017 laboratory totals reached 4 pCi/L (3.8%). The median result, 0.5 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 27.0 pCi/L.
Across 65 Alabama counties pooled together, 21.9% of tests reached that level, so Mobile County runs 18.1 points below its state. Against the national pool of 35.7%, the gap is 31.9 points lower. Its place in the state: 26th of 27 Alabama counties with 30 or more tests for the same period.
Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 3.8% share point the same way here. Baldwin County, the one bordering county with a figure for the same period, reported 0.0%.
Below the action level, 49 tests (94.2%) came in under 2 pCi/L, against 54.3% statewide, and 1 tests (1.9%) fell between 2 and 4, against 23.8% statewide. USGS geology rates 98% of the county's land low radon potential.
CDC's ten-year totals for Mobile County went from 21 tests (2005 to 2014) to 52 (2008 to 2017), the share going from 4.8% to 3.8%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Mobile County, Geology
The ground under Mobile County
PredictedUSGS's geologic map puts all of Mobile County's mapped land in one class: low radon potential. 97.9% of it lies in the area the map calls Coastal Plain, to which USGS gives a radon index of 7, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Coastal Plain | Marly sandy clay, chalk, and glauconitic sands. | Low | 7 | 97.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Mobile County beside the ground around it
Across Alabama 14.3% of the land is rated high; none of Mobile County's is. None of the 5 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Mobile County, Local resources
Radon testing and mitigation in Mobile 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
Mobile County, Questions
Questions about radon in Mobile County
Are radon levels high in Mobile County?
Over the 2008 to 2017 laboratory totals, 3.8% of the radon tests reported to CDC for Mobile County, Alabama were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.5 pCi/L. Of 27 Alabama counties with 30 or more tests for the same period, 25 reported a higher share; pooled, the state comes to 21.9%.
Which counties border Mobile County?
Mobile County borders 5 counties: Baldwin County, AL, George County, MS, Jackson County, MS, Greene County, MS and Washington County, AL.
Products
Mobile County, Products
Testing a home in Mobile County
In Mobile County, 3.8% of 52 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 21.9% pooled across Alabama. 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 Mobile 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
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
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Mobile County, Bordering counties
Counties bordering Mobile County
Calculated by Radon411- Radon levels in Baldwin County, ALEPA zone 3
0.0%at or above 4 pCi/L
Median 1.0 pCi/L · 31 tests · 3.8 points below Mobile County
- Radon levels in Washington County, ALEPA zone 3
0.0%at or above 4 pCi/L
Median 1.4 pCi/L · 4 tests · 3.8 points below Mobile County
- Radon levels in George County, MSEPA zone 3
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
- Radon levels in Jackson County, MSEPA zone 3
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
- Radon levels in Greene County, MSEPA zone 3
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Mobile County, Cities and towns
Cities and towns in Mobile County
About 411,658 people live in Mobile County by the Census Bureau's estimate for July 1, 2025, 2,756 fewer than in 2020 (−0.7%). That works out to 335 people per square mile of land. Its largest town, Mobile, has 200,824 residents, 48.8% of the total. Together its 11 incorporated places hold 64.8% of those residents; the other 35.2% live outside any of them. Reported testing is thin here: 52 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 Mobile to Mount Vernon, CDC publishes no figure by town: each reads Mobile County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Mobile | 200,824 | −2.7% | 48.8% |
| Prichard | 18,825 | −2.4% | 4.6% |
| Saraland | 16,652 | +1.9% | 4.0% |
| Satsuma | 6,851 | +1.2% | 1.7% |
| Semmes | 6,259 | +20.2% | 1.5% |
| Chickasaw | 6,166 | −4.5% | 1.5% |
| Citronelle | 3,897 | −1.0% | 0.9% |
| Bayou La Batre | 2,068 | −3.9% | 0.5% |
| Creola | 1,963 | +1.6% | 0.5% |
| Dauphin Island | 1,929 | +8.1% | 0.5% |
| Mount Vernon | 1,385 | +2.2% | 0.3% |
11 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).
Mobile County, Homes
Homes in Mobile County
Of Mobile County's 185,413 homes, 73% are detached houses, against 69% across Alabama; 15% are in buildings of five or more homes. Half of its homes were built before 1979, close to Alabama's 1985: 19% date from before 1960 and 20% from 2000 or later. 65% 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 | Mobile County | Alabama |
|---|---|---|
| Housing units | 185,413 | 2,316,192 |
| Detached houses | 73% | 69% |
| In buildings of 5 or more | 15% | 12% |
| Mobile homes | 7% | 13% |
| Built before 1960 | 19% | 16% |
| Built since 2000 | 20% | 27% |
| Middle year built | 1979 | 1985 |
| Owner-occupied | 65% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.