Radon Compass

Radon in Mississippi

We don't have lab test results for Mississippi yet. EPA zones for every county are below.

The EPA puts 0 of Mississippi's 82 counties in Zone 1, its highest radon category, 8 in Zone 2 and 74 in Zone 3.

Every county in Mississippi

Sorted by the share of homes tested at or above 4 pCi/L. Select a county for local details and costs.

CountyHomes testedAt or above 4MedianEPA zone
Adams CountyNo data––3
Alcorn CountyNo data––2
Amite CountyNo data––3
Attala CountyNo data––3
Benton CountyNo data––3
Bolivar CountyNo data––3
Calhoun CountyNo data––3
Carroll CountyNo data––3
Chickasaw CountyNo data––2
Choctaw CountyNo data––3
Claiborne CountyNo data––3
Clarke CountyNo data––3
Clay CountyNo data––2
Coahoma CountyNo data––3
Copiah CountyNo data––3
Covington CountyNo data––3
DeSoto CountyNo data––3
Forrest CountyNo data––3
Franklin CountyNo data––3
George CountyNo data––3
Greene CountyNo data––3
Grenada CountyNo data––3
Hancock CountyNo data––3
Harrison CountyNo data––3
Hinds CountyNo data––3
Holmes CountyNo data––3
Humphreys CountyNo data––3
Issaquena CountyNo data––3
Itawamba CountyNo data––3
Jackson CountyNo data––3
Jasper CountyNo data––3
Jefferson CountyNo data––3
Jefferson Davis CountyNo data––3
Jones CountyNo data––3
Kemper CountyNo data––3
Lafayette CountyNo data––3
Lamar CountyNo data––3
Lauderdale CountyNo data––3
Lawrence CountyNo data––3
Leake CountyNo data––3
Lee CountyNo data––2
Leflore CountyNo data––3
Lincoln CountyNo data––3
Lowndes CountyNo data––2
Madison CountyNo data––3
Marion CountyNo data––3
Marshall CountyNo data––3
Monroe CountyNo data––3
Montgomery CountyNo data––3
Neshoba CountyNo data––3
Newton CountyNo data––3
Noxubee CountyNo data––2
Oktibbeha CountyNo data––3
Panola CountyNo data––3
Pearl River CountyNo data––3
Perry CountyNo data––3
Pike CountyNo data––3
Pontotoc CountyNo data––2
Prentiss CountyNo data––3
Quitman CountyNo data––3
Rankin CountyNo data––3
Scott CountyNo data––3
Sharkey CountyNo data––3
Simpson CountyNo data––3
Smith CountyNo data––3
Stone CountyNo data––3
Sunflower CountyNo data––3
Tallahatchie CountyNo data––3
Tate CountyNo data––3
Tippah CountyNo data––3
Tishomingo CountyNo data––3
Tunica CountyNo data––3
Union CountyNo data––2
Walthall CountyNo data––3
Warren CountyNo data––3
Washington CountyNo data––3
Wayne CountyNo data––3
Webster CountyNo data––3
Wilkinson CountyNo data––3
Winston CountyNo data––3
Yalobusha CountyNo data––3
Yazoo CountyNo data––3

"–" means fewer than 20 tests or no lab data, too few for a reliable figure.

Sources

Last updated October 2026. How we calculate these numbers.