Radon levels in Mississippi: Low

The model predicts a population-weighted basement average of 1.5 pCi/L (model estimate) across Mississippi's 82 counties - about 17% below the US average of 1.8 pCi/L. Above-ground floors average 0.9 pCi/L.

Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.

0 / 82

EPA Zone 1 counties (0%)

8 / 74

Zone 2 / Zone 3 counties

0

counties predicted ≥ 4 pCi/L

0%

of ZIP codes predicted ≥ 4 pCi/L

Test Mississippi once anyway - radon varies house to house

The predicted basement average here is 1.5 pCi/L, below the EPA's 2 pCi/L "consider fixing" threshold. That's good news for the area - but the EPA still recommends every home be tested, because foundation cracks, soil pockets and ventilation make one house very different from its neighbor. One inexpensive kit settles it.

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What the data says about radon in Mississippi

According to the EPA zone map, 0 of Mississippi's 82 counties are EPA Zone 1 (0%), 8 are Zone 2 and 74 are Zone 3. Most counties fall in Zone 3, the EPA's lowest-potential class (predicted screening average under 2 pCi/L). Treat the map as a coarse prior: it predates two decades of test data and never replaces a test in your own home.

The 2001-2021 national model predicts a population-weighted basement average of 1.5 pCi/L for Mississippi (low range, 17% below the US average of 1.8). Of the 82 counties with predictions, 0 are predicted at or above 4 pCi/L, 0 in the 2-4 band and 82 below 2. The county range is narrow: from Forrest County at 1.33 to Alcorn County at 1.84 pCi/L, a spread of only 0.51.

0% of the state's modeled ZIP codes are predicted at or above 2 pCi/L, and 0% at or above the 4 pCi/L action level - below the national shares of 4.2% and 48.7%. No ZIP in the state is predicted above 4 on average - but averages hide individual homes, which is why the EPA still asks everyone to test.

Mississippi counties by predicted radon

Sorted highest to lowest predicted basement average (model estimate). 82 counties.

CountyPredicted basementUpstairsGradeEPA zoneZIPs
Alcorn County1.8 pCi/L1.1LowEPA Zone 23
Union County1.8 pCi/L1.1LowEPA Zone 23
Prentiss County1.8 pCi/L0.9LowEPA Zone 33
Tishomingo County1.7 pCi/L0.9LowEPA Zone 35
Lee County1.7 pCi/L1.0LowEPA Zone 27
Tate County1.7 pCi/L1.0LowEPA Zone 33
Grenada County1.7 pCi/L1.0LowEPA Zone 33
Pontotoc County1.7 pCi/L1.0LowEPA Zone 25
Tippah County1.7 pCi/L0.9LowEPA Zone 36
Chickasaw County1.6 pCi/L1.0LowEPA Zone 24
Leake County1.6 pCi/L0.8LowEPA Zone 33
Marshall County1.6 pCi/L0.9LowEPA Zone 35
Oktibbeha County1.6 pCi/L1.1LowEPA Zone 33
Clay County1.6 pCi/L1.1LowEPA Zone 24
Warren County1.6 pCi/L0.9LowEPA Zone 33
Attala County1.6 pCi/L0.8LowEPA Zone 37
Benton County1.6 pCi/L0.9LowEPA Zone 34
Lafayette County1.6 pCi/L0.8LowEPA Zone 36
Yalobusha County1.6 pCi/L0.9LowEPA Zone 34
Montgomery County1.6 pCi/L0.9LowEPA Zone 33
Rankin County1.6 pCi/L0.9LowEPA Zone 37
Webster County1.6 pCi/L0.9LowEPA Zone 34
Calhoun County1.6 pCi/L0.9LowEPA Zone 36
Choctaw County1.6 pCi/L0.9LowEPA Zone 33
Neshoba County1.6 pCi/L0.9LowEPA Zone 32
Scott County1.6 pCi/L0.8LowEPA Zone 34
Itawamba County1.5 pCi/L0.9LowEPA Zone 36
DeSoto County1.5 pCi/L0.9LowEPA Zone 38
Jasper County1.5 pCi/L0.9LowEPA Zone 37
Panola County1.5 pCi/L0.9LowEPA Zone 36
Lamar County1.5 pCi/L0.9LowEPA Zone 34
Noxubee County1.5 pCi/L0.9LowEPA Zone 23
Walthall County1.5 pCi/L0.9LowEPA Zone 31
Wayne County1.5 pCi/L0.9LowEPA Zone 32
Carroll County1.5 pCi/L0.9LowEPA Zone 34
Winston County1.5 pCi/L0.9LowEPA Zone 32
Bolivar County1.5 pCi/L0.8LowEPA Zone 311
Coahoma County1.5 pCi/L0.8LowEPA Zone 35
Lauderdale County1.5 pCi/L0.9LowEPA Zone 38
Humphreys County1.5 pCi/L0.7LowEPA Zone 34
Jefferson Davis County1.5 pCi/L0.8LowEPA Zone 35
Madison County1.5 pCi/L0.9LowEPA Zone 36
Newton County1.5 pCi/L0.8LowEPA Zone 37
Smith County1.5 pCi/L0.9LowEPA Zone 34
Yazoo County1.5 pCi/L0.7LowEPA Zone 35
Copiah County1.5 pCi/L0.8LowEPA Zone 34
Leflore County1.5 pCi/L0.7LowEPA Zone 35
Marion County1.5 pCi/L0.8LowEPA Zone 34
Monroe County1.5 pCi/L0.8LowEPA Zone 36
Simpson County1.5 pCi/L0.9LowEPA Zone 35
George County1.5 pCi/L0.9LowEPA Zone 31
Hinds County1.5 pCi/L0.8LowEPA Zone 317
Holmes County1.5 pCi/L0.8LowEPA Zone 34
Lowndes County1.5 pCi/L0.9LowEPA Zone 26
Pike County1.5 pCi/L0.9LowEPA Zone 34
Stone County1.5 pCi/L0.9LowEPA Zone 33
Wilkinson County1.5 pCi/L0.8LowEPA Zone 33
Amite County1.4 pCi/L0.8LowEPA Zone 33
Claiborne County1.4 pCi/L0.8LowEPA Zone 33
Clarke County1.4 pCi/L0.8LowEPA Zone 35
Kemper County1.4 pCi/L0.8LowEPA Zone 35
Lincoln County1.4 pCi/L0.8LowEPA Zone 33
Adams County1.4 pCi/L0.8LowEPA Zone 31
Franklin County1.4 pCi/L0.8LowEPA Zone 34
Issaquena County1.4 pCi/L0.7LowEPA Zone 32
Lawrence County1.4 pCi/L0.8LowEPA Zone 34
Quitman County1.4 pCi/L0.7LowEPA Zone 34
Tallahatchie County1.4 pCi/L0.8LowEPA Zone 37
Tunica County1.4 pCi/L0.7LowEPA Zone 33
Washington County1.4 pCi/L0.7LowEPA Zone 36
Jefferson County1.4 pCi/L0.8LowEPA Zone 33
Pearl River County1.4 pCi/L0.8LowEPA Zone 33
Sunflower County1.4 pCi/L0.7LowEPA Zone 37
Covington County1.4 pCi/L0.8LowEPA Zone 33
Sharkey County1.4 pCi/L0.7LowEPA Zone 33
Perry County1.4 pCi/L0.9LowEPA Zone 34
Jones County1.4 pCi/L0.8LowEPA Zone 36
Hancock County1.4 pCi/L0.8LowEPA Zone 35
Jackson County1.4 pCi/L0.8LowEPA Zone 37
Greene County1.4 pCi/L0.8LowEPA Zone 34
Harrison County1.4 pCi/L0.7LowEPA Zone 310
Forrest County1.3 pCi/L0.9LowEPA Zone 32

Radon levels in Mississippi cities

The 6 most-populous Mississippi places among the 1,000 largest US cities (Census incorporated places and CDPs), by population. City figures are ZIP-land-weighted means of the model's ZIP predictions (model estimate).

CityPopulationPredicted basementUpstairsGradeZIPs ≥ 4
Jackson143,7091.4 pCi/L0.8Low0%
Gulfport72,8231.3 pCi/L0.7Low0%
Southaven56,8511.5 pCi/L0.9Low0%
Hattiesburg48,4141.4 pCi/L0.9Low0%
Biloxi48,2351.3 pCi/L0.7Low0%
Olive Branch47,0291.6 pCi/L0.9Low0%

Highest-radon ZIP codes in Mississippi

The 10 Mississippi ZIP codes with the highest predicted basement average (model estimate), out of 377 modeled. A ZIP average is still an area figure - neighboring homes routinely test several pCi/L apart.

ZIPCountyPredicted basementUpstairsGrade
38865Alcorn County1.9 pCi/L1.0Low
38828Union County1.9 pCi/L1.0Low
38652Union County1.8 pCi/L1.1Low
38834Alcorn County1.8 pCi/L1.1Low
38829Prentiss County1.8 pCi/L0.9Low
38852Tishomingo County1.8 pCi/L0.9Low
38804Lee County1.8 pCi/L0.9Low
38849Lee County1.8 pCi/L1.0Low
38866Lee County1.8 pCi/L0.9Low
38601Lafayette County1.7 pCi/L0.9Low

Mississippi radon questions

Is radon high in Mississippi?
Mississippi's population-weighted predicted basement average is 1.5 pCi/L, about 17% below the US average of 1.8. 0 of its 82 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 0 are in the 2-4 "consider fixing" range and 82 are below 2. 0% of Mississippi ZIP codes are predicted at 4 or higher.
Which Mississippi county has the highest radon?
Alcorn County has the highest predicted basement average in Mississippi at 1.8 pCi/L (EPA Zone 2). The lowest is Forrest County at 1.3 pCi/L. These are area figures; individual homes in any county can test far higher.
How many EPA Zone 1 counties are in Mississippi?
0 of Mississippi's 82 counties (0%) are EPA Zone 1 (highest potential), 8 are Zone 2 and 74 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.
Should I test for radon in Mississippi?
Yes. Even though Mississippi's predicted average is below 2 pCi/L, the EPA recommends every home be tested - radon varies house to house, and 0% of Mississippi ZIP codes are still predicted at 2 pCi/L or higher.

Mississippi radon program

State programs keep lists of certified testers and mitigators and sometimes run kit programs. We link only pages we could verify, and Mississippi's program page did not respond when we checked, so start from the EPA state radon contacts page. Then read how to test and what mitigation costs.