Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Humphreys County, Mississippi
EPA puts Humphreys 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
7.0%
Shelby County, 146 miles
- Shelby
- 7.0%
Share at 4+ pCi/L, 341 tests, 2006 to 2015
Ground above low
None
8.1 pts below MS
- Humphreys
- 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 Humphreys 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
Humphreys County, At a glance
Humphreys 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 Humphreys County. Shelby County, TN, 146 miles away, is the nearest county with a figure over the 2006 to 2015 laboratory totals.
Humphreys County, Compared
Humphreys County radon figures, compared
Calculated by Radon411No Mississippi county, Humphreys 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 Shelby County, TN (146 miles away) at 7.0%, Pulaski County, AR (153 miles away) at 6.2% and Fayette County, TN (156 miles away) at 13.1%.
EPA's 1993 map puts Humphreys 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.
Humphreys County, Geology
The ground under Humphreys County
PredictedUSGS's geologic map puts all of Humphreys County's mapped land in one class: low radon potential. All of it lies in the area the map calls Mississippi Alluvial Plain, to which USGS gives a radon index of 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Mississippi Alluvial Plain | Alluvial sand, silt, gravel, and clay. | Low | 8 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Humphreys County beside the ground around it
Across Mississippi 0.1% of the land is rated high; none of Humphreys 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
Humphreys County, Local resources
Radon testing and mitigation in Humphreys 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
Humphreys County, Questions
Questions about radon in Humphreys County
Are radon levels high in Humphreys County?
No CDC testing statistics are published here for Humphreys County, Mississippi yet. Of the 8 nearest counties with a figure, within 179 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 31.9%.
Which counties border Humphreys County?
Humphreys County borders 6 counties: Washington County, Sharkey County, Holmes County, Yazoo County, Leflore County and Sunflower County.
Products
Humphreys County, Products
Testing a home in Humphreys County
No CDC figure names Humphreys County; the nearest county with one, Shelby County, TN (146 miles away), reported 7.0% 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 Humphreys 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
EcoBlu plug-in digital radon monitor with a display
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
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
Humphreys County, Bordering counties
Counties bordering Humphreys County
Calculated by Radon411counties bordering Humphreys County: 1 of 6
Humphreys County, Cities and towns
Cities and towns in Humphreys County
Humphreys County has been losing residents: from 7,734 in 2020 to 7,001 on July 1, 2025, a fall of 9.5% by the Census Bureau's estimates. That works out to 17 people per square mile of land. Its largest town, Belzoni, has 1,719 residents, 24.6% of the total. Together its 4 incorporated places hold 37.5% of those residents; the other 62.5% live outside any of them.
From Belzoni to Silver City, CDC publishes no figure by town: each reads Humphreys County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Belzoni | 1,719 | −9.0% | 24.6% |
| Isola | 573 | −9.5% | 8.2% |
| Louise | 166 | −6.7% | 2.4% |
| Silver City | 165 | −28.9% | 2.4% |
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).
Humphreys County, Homes
Homes in Humphreys County
Of Humphreys County's 3,529 homes, 74% are detached houses, against 69% across Mississippi; 10% are mobile homes. Half of its homes were built before 1979, close to Mississippi's 1986: 21% date from before 1960 and 18% from 2000 or later. 60% of occupied homes are lived in by their owner (Mississippi: 69%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Humphreys County | Mississippi |
|---|---|---|
| Housing units | 3,529 | 1,332,811 |
| Detached houses | 74% | 69% |
| In buildings of 5 or more | 6% | 9% |
| Mobile homes | 10% | 15% |
| Built before 1960 | 21% | 15% |
| Built since 2000 | 18% | 28% |
| Middle year built | 1979 | 1986 |
| Owner-occupied | 60% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.