Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Walthall County, Mississippi
EPA puts Walthall 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, 40 miles
- Tangipahoa Parish
- 0.0%
Share at 4+ pCi/L, 43 tests, 2006 to 2015
Ground above low
None
8.1 pts below MS
- Walthall
- 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 Walthall 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
Walthall County, At a glance
Walthall 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 Walthall County. Tangipahoa Parish, LA, 40 miles away, is the nearest county with a figure over the 2006 to 2015 laboratory totals.
Walthall County, Compared
Walthall County radon figures, compared
Calculated by Radon411CDC publishes no radon test figure for Walthall 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.
The nearest counties with a figure are Tangipahoa Parish, LA (40 miles away) at 0.0%, East Baton Rouge Parish, LA (72 miles away) at 0.0% and Jefferson Parish, LA (94 miles away) at 1.5%.
EPA's 1993 map puts Walthall 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.
Walthall County, Geology
The ground under Walthall County
PredictedUSGS's geologic map puts all of Walthall 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 | 99.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Walthall County beside the ground around it
Across Mississippi 0.1% of the land is rated high; none of Walthall 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
Walthall County, Local resources
Radon testing and mitigation in Walthall 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
Walthall County, Questions
Questions about radon in Walthall County
Are radon levels high in Walthall County?
No CDC testing statistics are published here for Walthall County, Mississippi yet. Of the 8 nearest counties with a figure, within 211 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 10.1%.
Which counties border Walthall County?
Walthall County borders 5 counties: Pike County, MS, Marion County, MS, Washington Parish, LA, Lincoln County, MS and Lawrence County, MS.
Products
Walthall County, Products
Testing a home in Walthall County
No CDC figure names Walthall County; the nearest county with one, Tangipahoa Parish, LA (40 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 Walthall 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
View Plus radon and air quality monitor
- C-NRPP 2024/25: Approved
- Battery
- Wi-Fi, Bluetooth
- Screen, app
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Walthall County, Bordering counties
Counties bordering Walthall 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 Pike County, MSEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Marion County, MSEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Lincoln County, MSEPA zone 3
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.
Walthall County, Cities and towns
Cities and towns in Walthall County
Walthall County's population has barely moved since 2020: 13,928 residents on July 1, 2025 against 13,869 then, by the Census Bureau's estimates. That works out to 34 people per square mile of land. Tylertown, its one incorporated place, has 1,486 residents, 10.7% of the total.
Tylertown is the one incorporated place here; CDC publishes no figure by town, so it reads Walthall County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Tylertown | 1,486 | −1.4% | 10.7% |
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).
Walthall County, Homes
Homes in Walthall County
Of Walthall County's 6,883 homes, 70% are detached houses, against 69% across Mississippi; 26% are mobile homes. Half of its homes were built before 1980, close to Mississippi's 1986: 13% date from before 1960 and 16% from 2000 or later. Owners live in 79% of the occupied homes (Mississippi: 69%), so for most households a test and a fix are their own to order.
| Homes | Walthall County | Mississippi |
|---|---|---|
| Housing units | 6,883 | 1,332,811 |
| Detached houses | 70% | 69% |
| In buildings of 5 or more | under 1% | 9% |
| Mobile homes | 26% | 15% |
| Built before 1960 | 13% | 15% |
| Built since 2000 | 16% | 28% |
| Middle year built | 1980 | 1986 |
| Owner-occupied | 79% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.