Mississippi Radon Levels
0Zone 1 (High)
8Zone 2 (Moderate)
74Zone 3 (Low)
No counties in Mississippi are classified as Zone 1 (highest risk), but 8 counties are Zone 2 (moderate potential). The EPA recommends testing all homes regardless of zone classification, as elevated radon can occur in any zone.
| County | EPA Zone | Risk Level |
|---|---|---|
| Adams County | Zone 3 | Lowest Potential |
| Alcorn County | Zone 2 | Moderate Potential |
| Amite County | Zone 3 | Lowest Potential |
| Attala County | Zone 3 | Lowest Potential |
| Benton County | Zone 3 | Lowest Potential |
| Bolivar County | Zone 3 | Lowest Potential |
| Calhoun County | Zone 3 | Lowest Potential |
| Carroll County | Zone 3 | Lowest Potential |
| Chickasaw County | Zone 2 | Moderate Potential |
| Choctaw County | Zone 3 | Lowest Potential |
| Claiborne County | Zone 3 | Lowest Potential |
| Clarke County | Zone 3 | Lowest Potential |
| Clay County | Zone 2 | Moderate Potential |
| Coahoma County | Zone 3 | Lowest Potential |
| Copiah County | Zone 3 | Lowest Potential |
| Covington County | Zone 3 | Lowest Potential |
| DeSoto County | Zone 3 | Lowest Potential |
| Forrest County | Zone 3 | Lowest Potential |
| Franklin County | Zone 3 | Lowest Potential |
| George County | Zone 3 | Lowest Potential |
| Greene County | Zone 3 | Lowest Potential |
| Grenada County | Zone 3 | Lowest Potential |
| Hancock County | Zone 3 | Lowest Potential |
| Harrison County | Zone 3 | Lowest Potential |
| Hinds County | Zone 3 | Lowest Potential |
| Holmes County | Zone 3 | Lowest Potential |
| Humphreys County | Zone 3 | Lowest Potential |
| Issaquena County | Zone 3 | Lowest Potential |
| Itawamba County | Zone 3 | Lowest Potential |
| Jackson County | Zone 3 | Lowest Potential |
| Jasper County | Zone 3 | Lowest Potential |
| Jefferson County | Zone 3 | Lowest Potential |
| Jefferson Davis County | Zone 3 | Lowest Potential |
| Jones County | Zone 3 | Lowest Potential |
| Kemper County | Zone 3 | Lowest Potential |
| Lafayette County | Zone 3 | Lowest Potential |
| Lamar County | Zone 3 | Lowest Potential |
| Lauderdale County | Zone 3 | Lowest Potential |
| Lawrence County | Zone 3 | Lowest Potential |
| Leake County | Zone 3 | Lowest Potential |
| Lee County | Zone 2 | Moderate Potential |
| Leflore County | Zone 3 | Lowest Potential |
| Lincoln County | Zone 3 | Lowest Potential |
| Lowndes County | Zone 2 | Moderate Potential |
| Madison County | Zone 3 | Lowest Potential |
| Marion County | Zone 3 | Lowest Potential |
| Marshall County | Zone 3 | Lowest Potential |
| Monroe County | Zone 3 | Lowest Potential |
| Montgomery County | Zone 3 | Lowest Potential |
| Neshoba County | Zone 3 | Lowest Potential |
| Newton County | Zone 3 | Lowest Potential |
| Noxubee County | Zone 2 | Moderate Potential |
| Oktibbeha County | Zone 3 | Lowest Potential |
| Panola County | Zone 3 | Lowest Potential |
| Pearl River County | Zone 3 | Lowest Potential |
| Perry County | Zone 3 | Lowest Potential |
| Pike County | Zone 3 | Lowest Potential |
| Pontotoc County | Zone 2 | Moderate Potential |
| Prentiss County | Zone 3 | Lowest Potential |
| Quitman County | Zone 3 | Lowest Potential |
| Rankin County | Zone 3 | Lowest Potential |
| Scott County | Zone 3 | Lowest Potential |
| Sharkey County | Zone 3 | Lowest Potential |
| Simpson County | Zone 3 | Lowest Potential |
| Smith County | Zone 3 | Lowest Potential |
| Stone County | Zone 3 | Lowest Potential |
| Sunflower County | Zone 3 | Lowest Potential |
| Tallahatchie County | Zone 3 | Lowest Potential |
| Tate County | Zone 3 | Lowest Potential |
| Tippah County | Zone 3 | Lowest Potential |
| Tishomingo County | Zone 3 | Lowest Potential |
| Tunica County | Zone 3 | Lowest Potential |
| Union County | Zone 2 | Moderate Potential |
| Walthall County | Zone 3 | Lowest Potential |
| Warren County | Zone 3 | Lowest Potential |
| Washington County | Zone 3 | Lowest Potential |
| Wayne County | Zone 3 | Lowest Potential |
| Webster County | Zone 3 | Lowest Potential |
| Wilkinson County | Zone 3 | Lowest Potential |
| Winston County | Zone 3 | Lowest Potential |
| Yalobusha County | Zone 3 | Lowest Potential |
| Yazoo County | Zone 3 | Lowest Potential |