EPA Zone Data 2026
MO Radon Levels
View EPA radon zone classifications for every county in MO. Select your county to see detailed risk data, testing recommendations, and mitigation cost estimates.
11
Zone 1
High Risk
High Risk
97
Zone 2
Moderate
Moderate
7
Zone 3
Low Risk
Low Risk
Adair
Zone 2
Andrew
Zone 1
Atchison
Zone 1
Audrain
Zone 2
Barry
Zone 2
Barton
Zone 2
Bates
Zone 2
Benton
Zone 2
Bollinger
Zone 2
Boone
Zone 2
Buchanan
Zone 1
Butler
Zone 3
Caldwell
Zone 2
Callaway
Zone 2
Camden
Zone 2
Cape Girardeau
Zone 2
Carroll
Zone 2
Carter
Zone 2
Cass
Zone 1
Cedar
Zone 2
Chariton
Zone 2
Christian
Zone 2
Clark
Zone 2
Clay
Zone 1
Clinton
Zone 1
Cole
Zone 2
Cooper
Zone 2
Crawford
Zone 2
Dade
Zone 2
Dallas
Zone 2
Daviess
Zone 2
DeKalb
Zone 2
Dent
Zone 2
Douglas
Zone 2
Dunklin
Zone 3
Franklin
Zone 2
Gasconade
Zone 2
Gentry
Zone 2
Greene
Zone 2
Grundy
Zone 2
Harrison
Zone 2
Henry
Zone 2
Hickory
Zone 2
Holt
Zone 1
Howard
Zone 2
Howell
Zone 2
Iron
Zone 1
Jackson
Zone 1
Jasper
Zone 2
Jefferson
Zone 2
Johnson
Zone 2
Knox
Zone 2
Laclede
Zone 2
Lafayette
Zone 2
Lawrence
Zone 2
Lewis
Zone 2
Lincoln
Zone 2
Linn
Zone 2
Livingston
Zone 2
Macon
Zone 2
Madison
Zone 2
Maries
Zone 2
Marion
Zone 2
McDonald
Zone 2
Mercer
Zone 2
Miller
Zone 2
Mississippi
Zone 3
Moniteau
Zone 2
Monroe
Zone 2
Montgomery
Zone 2
Morgan
Zone 2
New Madrid
Zone 3
Newton
Zone 2
Nodaway
Zone 1
Oregon
Zone 2
Osage
Zone 2
Ozark
Zone 2
Pemiscot
Zone 3
Perry
Zone 2
Pettis
Zone 2
Phelps
Zone 2
Pike
Zone 2
Platte
Zone 1
Polk
Zone 2
Pulaski
Zone 2
Putnam
Zone 2
Ralls
Zone 2
Randolph
Zone 2
Ray
Zone 2
Reynolds
Zone 2
Ripley
Zone 2
Saline
Zone 2
Schuyler
Zone 2
Scotland
Zone 2
Scott
Zone 3
Shannon
Zone 2
Shelby
Zone 2
St. Charles
Zone 2
St. Clair
Zone 2
St. Francois
Zone 2
St. Louis
Zone 2
St. Louis
Zone 2
Ste. Genevieve
Zone 2
Stoddard
Zone 3
Stone
Zone 2
Sullivan
Zone 2
Taney
Zone 2
Texas
Zone 2
Vernon
Zone 2
Warren
Zone 2
Washington
Zone 2
Wayne
Zone 2
Webster
Zone 2
Worth
Zone 2
Wright
Zone 2
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