Skip to content
RADON411

Locations and reports

Radon Levels in Smith County, Mississippi

EPA puts Smith 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

How to test this homeFind a certified tester

  • Nearest county

    0.0%

    Tangipahoa Parish, 110 miles

    Tangipahoa Parish
    0.0%

    Share at 4+ pCi/L, 43 tests, 2006 to 2015

  • Ground above low

    None

    8.1 pts below MS

    Smith
    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. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

Read a result for Smith County

Starts at EPA's action level

4.0pCi/L

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

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 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.

Interpret this readingWhat a fix costs

The data

Smith County, At a glance

Smith County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Smith County as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

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 Smith County. Tangipahoa Parish, LA, 110 miles away, is the nearest county with a figure over the 2006 to 2015 laboratory totals.

How to read these figures

Smith County, Compared

Smith County radon figures, compared

Calculated by Radon411

CDC publishes no radon test figure for Smith 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 (110 miles away) at 0.0%, Mobile County, AL (114 miles away) at 4.4% and East Baton Rouge Parish, LA (139 miles away) at 0.0%.

EPA's 1993 map puts Smith 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.

The United States and the counties around Smith County, 2006 to 2015, laboratory
AreaTestsAt or above 4 pCi/LMedian
United States, pooled2,669 counties, pooled1,805,52836.3%Not pooled
The nearest counties to Smith County with 30 or more tests, in any state, 2006 to 2015, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Tangipahoa Parish, LA110 mi430.0%0.1 pCi/L
Mobile County, AL114 mi454.4%0.2 pCi/L
East Baton Rouge Parish, LA139 mi480.0%0.6 pCi/L
Tuscaloosa County, AL145 mi6910.1%1.1 pCi/L
Escambia County, FL157 mi510.0%0.7 pCi/L
Jefferson Parish, LA158 mi671.5%0.2 pCi/L
Autauga County, AL171 mi3912.8%0.9 pCi/L
Santa Rosa County, FL173 mi303.3%0.8 pCi/L

Pooled shares: Radon411's sum of CDC's county counts for one period.

Smith County, Geology

The ground under Smith County

Predicted

USGS's geologic map puts all of Smith County's mapped land in one class: low radon potential. The map puts 51.7% of Smith County in the area it calls Jackson Prairies and 48.3% in Pine Hills. USGS gives the first a radon index of 8 and the second 6, both in the low band (5 to 8).

USGS's geologic areas under Smith County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Jackson PrairiesSand, marl, clay, and limestone.Low851.7%
Pine HillsSand, sandstone, bentonitic clay, quartzite, gravel, tuff, and siltstone.Low648.3%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Smith County beside the ground around it

Across Mississippi 0.1% of the land is rated high; none of Smith County's is. None of the 7 counties that border it has any moderate-potential ground either.

Share of land by USGS radon potential: Smith County, the 7 counties bordering it and Mississippi
AreaEPA zoneLow potentialModerate potentialHigh potential
Smith CountyZone 3100%NoneNone
Covington CountyZone 3100%NoneNone
Jasper CountyZone 3100%NoneNone
Simpson CountyZone 3100%NoneNone
Jones CountyZone 3100%NoneNone
Scott CountyZone 3100%NoneNone
Rankin CountyZone 3100%NoneNone
Newton CountyZone 3100%NoneNone
Mississippi82 counties, pooled by land areaVaries91.8%8.0%0.1%

The map rates the ground, not the air in any home.

Local help

Smith County, Local resources

Radon testing and mitigation in Smith County

What Mississippi's program says
Phone
1-800-626-7739

What it means

Smith County, Questions

Questions about radon in Smith County

Are radon levels high in Smith County?

No CDC testing statistics are published here for Smith County, Mississippi yet. Of the 8 nearest counties with a figure, within 173 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 12.8%.

Which counties border Smith County?

Smith County borders 7 counties: Covington County, Jasper County, Simpson County, Jones County, Scott County, Rankin County and Newton County.

Products

Smith County, Products

Testing a home in Smith County

No CDC figure names Smith County; the nearest county with one, Tangipahoa Parish, LA (110 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 Smith County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Smith County homes, compared

Explore

Smith County, Bordering counties

Counties bordering Smith County

Calculated by Radon411

Smith County, Cities and towns

Cities and towns in Smith County

About 13,991 people live in Smith County by the Census Bureau's estimate for July 1, 2025, 209 fewer than in 2020 (−1.5%). That works out to 22 people per square mile of land. No town dominates: Taylorsville, the largest, has 1,103 residents, 7.9% of the total. Together its 5 incorporated places hold 22.5% of those residents; the other 77.5% live outside any of them.

From Taylorsville to Sylvarena, CDC publishes no figure by town: each reads Smith County's.

The cities and towns in Smith County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Taylorsville1,103−3.6%7.9%
Raleigh1,066−1.9%7.6%
Polkville590Level4.2%
Mize310−2.2%2.2%
Sylvarena85−1.2%0.6%

5 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).

Smith County, Homes

Homes in Smith County

Of Smith County's 6,684 homes, 68% are detached houses, against 69% across Mississippi; 28% are mobile homes. Half of its homes were built before 1983, close to Mississippi's 1986: 17% date from before 1960 and 27% from 2000 or later. Owners live in 86% of the occupied homes (Mississippi: 69%), so for most households a test and a fix are their own to order.

Homes in Smith County, Mississippi, 2019 to 2023
HomesSmith CountyMississippi
Housing units6,6841,332,811
Detached houses68%69%
In buildings of 5 or more2%9%
Mobile homes28%15%
Built before 196017%15%
Built since 200027%28%
Middle year built19831986
Owner-occupied86%69%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.