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 Marion County, Mississippi
EPA puts Marion County in Zone 3, its lowest radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Nearest county
0.0%
Tangipahoa Parish, 54 miles
- Tangipahoa Parish
- 0.0%
Share at 4+ pCi/L, 43 tests, 2006 to 2015
Ground above low
None
8.1 pts below MS
- Marion
- 0.0%
- MS
- 8.1%
Share of land USGS rates moderate or high potential
Tests reported
0
None published
A home here needs its own test
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 Marion 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
Marion County, At a glance
Marion County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
No CDC test figures here
CDC has published no radon test figures for Marion County. Tangipahoa Parish, LA, 54 miles away, is the nearest county with a figure over the 2006 to 2015 laboratory totals.
Marion County, Compared
Marion County radon figures, compared
Calculated by Radon411No Mississippi county, Marion County included, has a radon test figure from CDC; over the 2006 to 2015 laboratory totals, the agency's counts name 2,669 counties in other states. Across every county in the country with a figure (2,669), 36.3% of reported tests reached that level; no Mississippi county contributes to that pool.
The nearest counties with a figure are Tangipahoa Parish, LA (54 miles away) at 0.0%, East Baton Rouge Parish, LA (89 miles away) at 0.0% and Mobile County, AL (101 miles away) at 4.4%.
EPA's 1993 map puts Marion County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Marion County, Geology
The ground under Marion County
PredictedUSGS's geologic map puts all of Marion County's mapped land in one class: low radon potential. All of it lies in the area the map calls Pine Hills, to which USGS gives a radon index of 6, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Pine Hills | Sand, sandstone, bentonitic clay, quartzite, gravel, tuff, and siltstone. | Low | 6 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Marion County beside the ground around it
Across Mississippi 0.1% of the land is rated high; none of Marion County's is. None of the 6 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Marion County, Local resources
Radon testing and mitigation in Marion County
- Mississippi Radon ProgramMississippi Radon Program, run by Mississippi State Department of Health, answers questions about testing, mitigation and the rules in Mississippi.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 Mississippi directoryNo professionals are listed in Mississippi yet. The state program can point you to registered testers and mitigators.
What Mississippi's program says
- Phone
- 1-800-626-7739
What it means
Marion County, Questions
Questions about radon in Marion County
Are radon levels high in Marion County?
No CDC testing statistics are published here for Marion County, Mississippi yet. Of the 8 nearest counties with a figure, within 207 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 12.8%.
Which counties border Marion County?
Marion County borders 6 counties: Walthall County, MS, Lamar County, MS, Jefferson Davis County, MS, Lawrence County, MS, Washington Parish, LA and Pearl River County, MS.
Products
Marion County, Products
Testing a home in Marion County
No CDC figure names Marion County; the nearest county with one, Tangipahoa Parish, LA (54 miles away), reported 0.0% of its tests at or above 4 pCi/L over the 2006 to 2015 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 Marion 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
Wave Radon battery smart radon monitor
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- App only
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Marion County, Bordering counties
Counties bordering Marion County
Calculated by Radon411- Radon levels in Washington Parish, LAEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
- Radon levels in Walthall County, MSEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Lamar County, MSEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Lawrence County, MSEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Pearl River County, MSEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
Marion County, Cities and towns
Cities and towns in Marion County
About 24,001 people live in Marion County by the Census Bureau's estimate for July 1, 2025, 369 fewer than in 2020 (−1.5%). That works out to 44 people per square mile of land. Columbia, its one incorporated place, has 6,525 residents, 27.2% of the total.
Columbia is the one incorporated place here; CDC publishes no figure by town, so it reads Marion County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Columbia | 6,525 | −3.5% | 27.2% |
One incorporated place, 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).
Marion County, Homes
Homes in Marion County
Of Marion County's 11,165 homes, 72% are detached houses, against 69% across Mississippi; 22% are mobile homes. Half of its homes were built before 1980, close to Mississippi's 1986: 20% date from before 1960 and 16% from 2000 or later. Owners live in 78% of the occupied homes (Mississippi: 69%), so for most households a test and a fix are their own to order.
| Homes | Marion County | Mississippi |
|---|---|---|
| Housing units | 11,165 | 1,332,811 |
| Detached houses | 72% | 69% |
| In buildings of 5 or more | 2% | 9% |
| Mobile homes | 22% | 15% |
| Built before 1960 | 20% | 15% |
| Built since 2000 | 16% | 28% |
| Middle year built | 1980 | 1986 |
| Owner-occupied | 78% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.