Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Jefferson County, Mississippi
EPA puts Jefferson 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%
East Baton Rouge Parish, 82 miles
- East Baton Rouge Parish
- 0.0%
Share at 4+ pCi/L, 48 tests, 2006 to 2015
Ground above low
None
8.1 pts below MS
- Jefferson
- 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 Jefferson 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
Jefferson County, At a glance
Jefferson 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 Jefferson County. East Baton Rouge Parish, LA, 82 miles away, is the nearest county with a figure over the 2006 to 2015 laboratory totals.
Jefferson County, Compared
Jefferson County radon figures, compared
Calculated by Radon411No Mississippi county, Jefferson 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 East Baton Rouge Parish, LA (82 miles away) at 0.0%, Tangipahoa Parish, LA (85 miles away) at 0.0% and Jefferson Parish, LA (145 miles away) at 1.5%.
EPA's 1993 map puts Jefferson 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.
Jefferson County, Geology
The ground under Jefferson County
PredictedUSGS's geologic map puts all of Jefferson County's mapped land in one class: low radon potential. The map puts 46.0% of Jefferson County in the area it calls Loess Hills and 43.6% in Pine Hills, with one smaller area beside them. USGS gives the first a radon index of 7 and the second 6, both in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Loess Hills | Loess. | Low | 7 | 46.0% |
| Pine Hills | Sand, sandstone, bentonitic clay, quartzite, gravel, tuff, and siltstone. | Low | 6 | 43.6% |
| Mississippi Alluvial Plain | Alluvial sand, silt, gravel, and clay. | Low | 8 | 10.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Jefferson County beside the ground around it
Across Mississippi 0.1% of the land is rated high; none of Jefferson 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
Jefferson County, Local resources
Radon testing and mitigation in Jefferson 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
Jefferson County, Questions
Questions about radon in Jefferson County
Are radon levels high in Jefferson County?
No CDC testing statistics are published here for Jefferson County, Mississippi yet. Of the 8 nearest counties with a figure, within 230 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 31.9%.
Which counties border Jefferson County?
Jefferson County borders 6 counties: Franklin County, MS, Claiborne County, MS, Adams County, MS, Tensas Parish, LA, Copiah County, MS and Lincoln County, MS.
Products
Jefferson County, Products
Testing a home in Jefferson County
No CDC figure names Jefferson County; the nearest county with one, East Baton Rouge Parish, LA (82 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 Jefferson 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
MonitorAEGTEST
HOUND-1085 palm-sized rechargeable radon detector
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Jefferson County, Bordering counties
Counties bordering Jefferson County
Calculated by Radon411counties bordering Jefferson County: 1 of 6
Jefferson County, Cities and towns
Cities and towns in Jefferson County
Jefferson County has been losing residents: from 7,248 in 2020 to 6,825 on July 1, 2025, a fall of 5.8% by the Census Bureau's estimates. That works out to 13 people per square mile of land. Fayette, its one incorporated place, has 1,315 residents, 19.3% of the total.
Fayette is the one incorporated place here; CDC publishes no figure by town, so it reads Jefferson County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Fayette | 1,315 | −8.9% | 19.3% |
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).
Jefferson County, Homes
Homes in Jefferson County
Mobile homes are 36% of Jefferson County's 3,383 homes and detached houses 54%, against 69% across Mississippi. Half of its homes were built before 1984, close to Mississippi's 1986: 6% date from before 1960 and 15% 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 | Jefferson County | Mississippi |
|---|---|---|
| Housing units | 3,383 | 1,332,811 |
| Detached houses | 54% | 69% |
| In buildings of 5 or more | 2% | 9% |
| Mobile homes | 36% | 15% |
| Built before 1960 | 6% | 15% |
| Built since 2000 | 15% | 28% |
| Middle year built | 1984 | 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.