Title reports $49 · others $100–$400See prices
HeritageDeed
Order

Radon in Mississippi: radon map by county

EPA's Map of Radon Zones puts 0 of Mississippi's 82 counties in Zone 1 (predicted average indoor radon above 4 pCi/L), 8 in Zone 2 and 74 in Zone 3.

0
counties in Zone 1 (above 4 pCi/L predicted)
8
counties in Zone 2 (2 to 4)
74
counties in Zone 3 (below 2)
n/a
of 0 lab tests at or above 4 pCi/L

Radon by county in Mississippi

EPA radon zone and radon test results for each county in Mississippi
CountyEPA zoneLab testsMedian4+ pCi/L
Adams County Zone 3n/an/an/a
Alcorn County Zone 2n/an/an/a
Amite County Zone 3n/an/an/a
Attala County Zone 3n/an/an/a
Benton County Zone 3n/an/an/a
Bolivar County Zone 3n/an/an/a
Calhoun County Zone 3n/an/an/a
Carroll County Zone 3n/an/an/a
Chickasaw County Zone 2n/an/an/a
Choctaw County Zone 3n/an/an/a
Claiborne County Zone 3n/an/an/a
Clarke County Zone 3n/an/an/a
Clay County Zone 2n/an/an/a
Coahoma County Zone 3n/an/an/a
Copiah County Zone 3n/an/an/a
Covington County Zone 3n/an/an/a
DeSoto County Zone 3n/an/an/a
Forrest County Zone 3n/an/an/a
Franklin County Zone 3n/an/an/a
George County Zone 3n/an/an/a
Greene County Zone 3n/an/an/a
Grenada County Zone 3n/an/an/a
Hancock County Zone 3n/an/an/a
Harrison County Zone 3n/an/an/a
Hinds County Zone 3n/an/an/a
Holmes County Zone 3n/an/an/a
Humphreys County Zone 3n/an/an/a
Issaquena County Zone 3n/an/an/a
Itawamba County Zone 3n/an/an/a
Jackson County Zone 3n/an/an/a
Jasper County Zone 3n/an/an/a
Jefferson County Zone 3n/an/an/a
Jefferson Davis County Zone 3n/an/an/a
Jones County Zone 3n/an/an/a
Kemper County Zone 3n/an/an/a
Lafayette County Zone 3n/an/an/a
Lamar County Zone 3n/an/an/a
Lauderdale County Zone 3n/an/an/a
Lawrence County Zone 3n/an/an/a
Leake County Zone 3n/an/an/a
Lee County Zone 2n/an/an/a
Leflore County Zone 3n/an/an/a
Lincoln County Zone 3n/an/an/a
Lowndes County Zone 2n/an/an/a
Madison County Zone 3n/an/an/a
Marion County Zone 3n/an/an/a
Marshall County Zone 3n/an/an/a
Monroe County Zone 3n/an/an/a
Montgomery County Zone 3n/an/an/a
Neshoba County Zone 3n/an/an/a
Newton County Zone 3n/an/an/a
Noxubee County Zone 2n/an/an/a
Oktibbeha County Zone 3n/an/an/a
Panola County Zone 3n/an/an/a
Pearl River County Zone 3n/an/an/a
Perry County Zone 3n/an/an/a
Pike County Zone 3n/an/an/a
Pontotoc County Zone 2n/an/an/a
Prentiss County Zone 3n/an/an/a
Quitman County Zone 3n/an/an/a
Rankin County Zone 3n/an/an/a
Scott County Zone 3n/an/an/a
Sharkey County Zone 3n/an/an/a
Simpson County Zone 3n/an/an/a
Smith County Zone 3n/an/an/a
Stone County Zone 3n/an/an/a
Sunflower County Zone 3n/an/an/a
Tallahatchie County Zone 3n/an/an/a
Tate County Zone 3n/an/an/a
Tippah County Zone 3n/an/an/a
Tishomingo County Zone 3n/an/an/a
Tunica County Zone 3n/an/an/a
Union County Zone 2n/an/an/a
Walthall County Zone 3n/an/an/a
Warren County Zone 3n/an/an/a
Washington County Zone 3n/an/an/a
Wayne County Zone 3n/an/an/a
Webster County Zone 3n/an/an/a
Wilkinson County Zone 3n/an/an/a
Winston County Zone 3n/an/an/a
Yalobusha County Zone 3n/an/an/a
Yazoo County Zone 3n/an/an/a

Lab tests: buildings tested by radon laboratories, 2008 to 2017; median in pCi/L; “4+ pCi/L” is the share of tests at or above EPA's action level. n/a: no value on file (no tests, or too few to report).

What the zones mean

Zone 1 counties have a predicted average indoor radon screening level above 4 pCi/L, Zone 2 from 2 to 4 pCi/L and Zone 3 below 2 pCi/L. The prediction is from 1993 indoor measurements, geology, aerial radioactivity, soils and foundation types. EPA: “This map should not be used to determine if individual homes need to be tested.” EPA recommends fixing a home at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, because there is no known safe level of exposure.

Check one Mississippi address

Environmental Records Report, $29. PDF and JSON, usually ready in about a minute.

Radon in Mississippi: questions

What radon zone is Mississippi?

EPA's 1993 map does not give states one zone; it zones each county. In Mississippi, 0 counties are Zone 1, 8 Zone 2 and 74 Zone 3. EPA says the map "should not be used to determine if individual homes need to be tested".

Should I test for radon in Mississippi?

Yes. EPA recommends testing every home no matter where it is, fixing it at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, because there is no known safe level of radon exposure.

States bordering Mississippi

Radon in Alabama (13 of 67 in Zone 1)Radon in Arkansas (0 of 75 in Zone 1)Radon in Louisiana (0 of 64 in Zone 1)Radon in Tennessee (39 of 95 in Zone 1)

Other free hazard lookups

All of these, plus wetlands, FEMA hazard ratings and the federal contamination lists, are in the Environmental Records Report for any US address ($29).

Superfund sites in Mississippi · Radon map of every state

Data compiled 2026-10-20. County-level screening information, not a radon measurement of any building.