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, Mississippi
EPA puts Marshall 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
Highest bordering
13.1%
Fayette County
- Fayette
- 13.1%
- Shelby
- 7.0%
2 of 7 neighbours have 30+ tests, 2006 to 2015
Nearest county
13.1%
Fayette County, 30 miles
- Fayette
- 13.1%
Share at 4+ pCi/L, 84 tests, 2006 to 2015
Ground above low
None
8.1 pts below MS
- Marshall
- 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 Marshall 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
Marshall County, At a glance
Marshall 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 Marshall County. Of the counties bordering it, 2 have a figure over the 2006 to 2015 laboratory totals: Fayette County, TN reported the largest share at or above 4 pCi/L, 13.1%, and Shelby County, TN the smallest, 7.0%.
Marshall County, Compared
Marshall County radon figures, compared
Calculated by Radon411CDC publishes no radon test figure for Marshall County, and none for any other Mississippi county: its counts over the 2006 to 2015 laboratory totals cover 2,669 counties elsewhere in the country. 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.
Of the counties bordering it, 2 have a figure over the 2006 to 2015 laboratory totals: Fayette County, TN reported the largest share at or above 4 pCi/L, 13.1%, and Shelby County, TN the smallest, 7.0%. Farther out, Tipton County, TN (53 miles away) at 5.6%, McNairy County, TN (60 miles away) at 8.2% and Chester County, TN (68 miles away) at 0.0% have figures too.
EPA's 1993 map puts Marshall 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.
Marshall County, Geology
The ground under Marshall County
PredictedUSGS's geologic map puts all of Marshall County's mapped land in one class: low radon potential. The map puts 91.6% of Marshall County in the area it calls North Central Hills/Flatwoods and 8.4% in Loess Hills. USGS gives the first a radon index of 8 and the second 7, both in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| North Central Hills/Flatwoods | Tertiary nonmarine to deltaic sediments ranging from sand to clay. | Low | 8 | 91.6% |
| Loess Hills | Loess. | Low | 7 | 8.4% |
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
Across Mississippi 0.1% of the land is rated high; none of Marshall County's is. Of the 7 counties that border it, 1 has more moderate-potential ground, Union County the most at 53.4%.
The map rates the ground, not the air in any home.
Local help
Marshall County, Local resources
Radon testing and mitigation in Marshall 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
Marshall County, Questions
Questions about radon in Marshall County
Are radon levels high in Marshall County?
No CDC testing statistics are published here for Marshall County, Mississippi yet. Of the counties bordering it, 2 have a figure over the 2006 to 2015 laboratory totals: Fayette County, TN reported the largest share at or above 4 pCi/L, 13.1%, and Shelby County, TN the smallest, 7.0%.
Which counties border Marshall County?
Marshall County borders 7 counties: Benton County, MS, Tate County, MS, DeSoto County, MS, Lafayette County, MS, Fayette County, TN, Union County, MS and Shelby County, TN.
Products
Marshall County, Products
Testing a home in Marshall County
No CDC figure names Marshall County; the nearest county with one, Fayette County, TN (30 miles away), reported 13.1% 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 Marshall 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
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 Fayette County, TNEPA zone 3
13.1%at or above 4 pCi/L
Median 1.2 pCi/L · 84 tests
- Radon levels in Shelby County, TNEPA zone 3
7.0%at or above 4 pCi/L
Median 1.0 pCi/L · 341 tests
- Radon levels in Benton County, MSEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Tate County, MSEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in DeSoto County, MSEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Lafayette County, MSEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Union County, MSEPA zone 2
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
Marshall County, Cities and towns
Cities and towns in Marshall County
The Census Bureau estimates 34,654 residents in Marshall County for July 1, 2025, 874 more than in 2020 (+2.6%). That works out to 49 people per square mile of land. No town dominates: Holly Springs, the largest, has 6,402 residents, 18.5% of the total. Together its 3 incorporated places hold 23.7% of those residents; the other 76.3% live outside any of them.
From Holly Springs to Potts Camp, CDC publishes no figure by town: each reads Marshall County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Holly Springs | 6,402 | −7.8% | 18.5% |
| Byhalia | 1,412 | +5.2% | 4.1% |
| Potts Camp | 393 | −6.0% | 1.1% |
3 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).
Marshall County, Homes
Homes in Marshall County
Of Marshall County's 15,308 homes, 71% are detached houses, against 69% across Mississippi; 23% are mobile homes. Half of its homes were built before 1991, close to Mississippi's 1986: 10% date from before 1960 and 33% from 2000 or later. Owners live in 77% of the occupied homes (Mississippi: 69%), so for most households a test and a fix are their own to order.
| Homes | Marshall County | Mississippi |
|---|---|---|
| Housing units | 15,308 | 1,332,811 |
| Detached houses | 71% | 69% |
| In buildings of 5 or more | 3% | 9% |
| Mobile homes | 23% | 15% |
| Built before 1960 | 10% | 15% |
| Built since 2000 | 33% | 28% |
| Middle year built | 1991 | 1986 |
| Owner-occupied | 77% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.