Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Simpson County, Mississippi
EPA puts Simpson 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, 93 miles
- Tangipahoa Parish
- 0.0%
Share at 4+ pCi/L, 43 tests, 2006 to 2015
Ground above low
None
8.1 pts below MS
- Simpson
- 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 Simpson 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
Simpson County, At a glance
Simpson 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 Simpson County. Tangipahoa Parish, LA, 93 miles away, is the nearest county with a figure over the 2006 to 2015 laboratory totals.
Simpson County, Compared
Simpson County radon figures, compared
Calculated by Radon411Simpson County is in a state CDC's county radon counts do not reach: no Mississippi county has a figure, while 2,669 counties elsewhere do over the 2006 to 2015 laboratory totals. 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 (93 miles away) at 0.0%, East Baton Rouge Parish, LA (118 miles away) at 0.0% and Mobile County, AL (128 miles away) at 4.4%.
EPA's 1993 map puts Simpson 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.
Simpson County, Geology
The ground under Simpson County
PredictedUSGS's geologic map puts all of Simpson 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.
Simpson County beside the ground around it
Across Mississippi 0.1% of the land is rated high; none of Simpson County's is. None of the 7 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Simpson County, Local resources
Radon testing and mitigation in Simpson 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
Simpson County, Questions
Questions about radon in Simpson County
Are radon levels high in Simpson County?
No CDC testing statistics are published here for Simpson County, Mississippi yet. Of the 8 nearest counties with a figure, within 197 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 12.8%.
Which counties border Simpson County?
Simpson County borders 7 counties: Jefferson Davis County, Lawrence County, Covington County, Smith County, Rankin County, Copiah County and Hinds County.
Products
Simpson County, Products
Testing a home in Simpson County
No CDC figure names Simpson County; the nearest county with one, Tangipahoa Parish, LA (93 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 Simpson 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
lüft plug-in radon and indoor air quality monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi, Bluetooth
- App only
First reading: Within 90 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Simpson County, Bordering counties
Counties bordering Simpson County
Calculated by Radon411counties bordering Simpson County: 1 of 7
Simpson County, Cities and towns
Cities and towns in Simpson County
About 25,498 people live in Simpson County by the Census Bureau's estimate for July 1, 2025, 389 fewer than in 2020 (−1.5%). That works out to 43 people per square mile of land. No town dominates: Magee, the largest, has 3,904 residents, 15.3% of the total. Together its 4 incorporated places hold 25.7% of those residents; the other 74.3% live outside any of them.
From Magee to Braxton, CDC publishes no figure by town: each reads Simpson County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Magee | 3,904 | −2.3% | 15.3% |
| Mendenhall | 2,115 | −3.7% | 8.3% |
| D'Lo | 365 | −2.9% | 1.4% |
| Braxton | 181 | −1.1% | 0.7% |
4 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).
Simpson County, Homes
Homes in Simpson County
Of Simpson County's 11,661 homes, 69% are detached houses, against 69% across Mississippi; 25% are mobile homes. Half of its homes were built before 1984, close to Mississippi's 1986: 17% date from before 1960 and 26% from 2000 or later. Owners live in 80% of the occupied homes (Mississippi: 69%), so for most households a test and a fix are their own to order.
| Homes | Simpson County | Mississippi |
|---|---|---|
| Housing units | 11,661 | 1,332,811 |
| Detached houses | 69% | 69% |
| In buildings of 5 or more | 2% | 9% |
| Mobile homes | 25% | 15% |
| Built before 1960 | 17% | 15% |
| Built since 2000 | 26% | 28% |
| Middle year built | 1984 | 1986 |
| Owner-occupied | 80% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.