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Radon zones in Mississippi

The EPA assigns every county in Mississippi to one of three radon potential zones. No county in Mississippi is in Zone 1. That is a statement about predicted county averages, not about any individual home - homes above the action level are found in all three zones.

82
Counties
0
Zone 1 counties
Predicted average above 4 pCi/L
8
Zone 2 counties
Predicted average 2-4 pCi/L
74
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Mississippi

Every county in Mississippi, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 0Zone 2 · 8Zone 3 · 74

Hover a county · click to open it

County by county

All 82 Mississippi counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Alcorn County234k9.9%19.3%41.8
Chickasaw County217k10.6%19.9%48.4
Clay County218k10.3%19.1%37.3
Lee County283k7.3%15.4%52.6
Lowndes County257k8.0%15.9%40.8
Noxubee County29,91411.0%21.3%34.2
Pontotoc County232k8.6%17.7%51.4
Union County228k9.3%18.5%49.1
Adams County329k11.0%20.2%46.1
Amite County312k12.2%20.4%42.7
Attala County317k9.8%18.2%53.5
Benton County37,43810.2%19.4%46.9
Bolivar County329k10.7%19.8%56.8
Calhoun County313k11.4%20.1%51.6
Carroll County39,53511.3%19.4%47.1
Choctaw County38,0889.7%17.2%44.7
Claiborne County38,6179.8%18.7%31.9
Clarke County315k10.6%19.0%46.3
Coahoma County320k11.1%21.1%56.8
Copiah County328k9.7%17.8%44.0
Covington County318k9.1%18.0%46.8
DeSoto County3193k6.2%13.9%50.1
Forrest County378k7.4%15.2%51.2
Franklin County37,61011.3%20.0%42.8
George County326k8.7%18.2%56.7
Greene County314k8.8%19.2%38.9
Grenada County321k9.9%18.5%52.6
Hancock County346k8.8%15.7%47.0
Harrison County3211k8.0%16.3%49.2
Hinds County3215k7.7%15.9%40.5
Holmes County316k11.6%22.4%47.1
Humphreys County37,21613.4%23.2%61.2
Issaquena County31,2569.5%21.6% -
Itawamba County324k8.2%16.1%45.4
Jackson County3146k7.7%15.4%43.5
Jasper County316k10.0%18.7%42.2
Jefferson County36,94111.5%21.5%43.3
Jefferson Davis County311k11.6%20.0%32.6
Jones County366k9.3%17.6%46.6
Kemper County38,5849.5%17.5%39.6
Lafayette County358k6.2%12.9%31.0
Lamar County366k7.1%14.8%36.4
Lauderdale County371k9.7%18.5%39.9
Lawrence County312k11.8%21.7%47.7
Leake County321k9.7%19.3%50.2
Leflore County326k10.6%20.9%58.8
Lincoln County335k9.2%18.0%46.5
Madison County3113k5.8%12.0%38.0
Marion County324k10.6%20.4%50.7
Marshall County334k10.5%20.3%62.1
Monroe County334k9.9%18.7%46.3
Montgomery County39,60011.4%19.4%33.9
Neshoba County329k10.4%21.0%45.6
Newton County321k9.4%18.4%42.3
Oktibbeha County351k6.2%12.4%33.4
Panola County333k10.6%20.4%55.1
Pearl River County358k9.3%17.6%49.6
Perry County311k10.2%19.5%53.9
Pike County339k10.5%20.3%41.9
Prentiss County325k9.1%17.5%52.8
Quitman County35,54612.4%23.2%47.4
Rankin County3160k6.4%13.1%37.2
Scott County328k10.5%20.6%45.3
Sharkey County33,33613.3%22.8% -
Simpson County326k9.4%18.1%44.3
Smith County314k11.0%19.8%43.4
Stone County319k8.6%17.1%54.6
Sunflower County324k10.1%21.4%40.5
Tallahatchie County312k10.2%20.7%53.5
Tate County328k8.1%16.4%60.5
Tippah County321k9.8%18.7%51.0
Tishomingo County319k10.7%19.0%61.8
Tunica County39,23411.2%23.5%57.4
Walthall County314k10.4%19.3%39.8
Warren County342k8.2%16.1%49.7
Washington County342k11.1%20.7%56.6
Wayne County320k10.7%20.2%47.1
Webster County39,9888.5%16.9%31.9
Wilkinson County38,05810.5%20.6%53.3
Winston County317k11.0%19.8%45.1
Yalobusha County312k11.4%20.7%64.8
Yazoo County326k10.7%23.5%64.5

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Other states

Radon zones elsewhere