EPA radon zone by US county
Pick your state, then your county. EPA sorts counties into three zones by potential for elevated indoor radon. The zone is an area estimate, so EPA says all homes should be tested.
States
- Alabama Zone 1: 13, Zone 2: 33, Zone 3: 21
- Alaska Zone 1: 0, Zone 2: 5, Zone 3: 21
- Arizona Zone 1: 0, Zone 2: 15, Zone 3: 0
- Arkansas Zone 1: 0, Zone 2: 14, Zone 3: 61
- California Zone 1: 2, Zone 2: 29, Zone 3: 27
- Colorado Zone 1: 52, Zone 2: 11, Zone 3: 0
- Connecticut Zone 1: 4, Zone 2: 3, Zone 3: 1
- Florida Zone 1: 0, Zone 2: 9, Zone 3: 58
- Georgia Zone 1: 4, Zone 2: 55, Zone 3: 100
- Hawaii Zone 1: 0, Zone 2: 0, Zone 3: 5
- Idaho Zone 1: 19, Zone 2: 20, Zone 3: 5
- Illinois Zone 1: 56, Zone 2: 43, Zone 3: 3
- Indiana Zone 1: 57, Zone 2: 35, Zone 3: 0
- Iowa Zone 1: 99, Zone 2: 0, Zone 3: 0
- Kansas Zone 1: 65, Zone 2: 40, Zone 3: 0
- Kentucky Zone 1: 30, Zone 2: 82, Zone 3: 8
- Louisiana Zone 1: 0, Zone 2: 0, Zone 3: 64
- Maine Zone 1: 12, Zone 2: 4, Zone 3: 0
- Maryland, Delaware and DC Zone 1: 8, Zone 2: 9, Zone 3: 10
- Massachusetts Zone 1: 3, Zone 2: 10, Zone 3: 1
- Michigan Zone 1: 9, Zone 2: 32, Zone 3: 42
- Minnesota Zone 1: 68, Zone 2: 19, Zone 3: 0
- Mississippi Zone 1: 0, Zone 2: 8, Zone 3: 74
- Missouri Zone 1: 11, Zone 2: 97, Zone 3: 7
- Montana Zone 1: 50, Zone 2: 7, Zone 3: 0
- Nebraska Zone 1: 53, Zone 2: 24, Zone 3: 16
- Nevada Zone 1: 9, Zone 2: 7, Zone 3: 1
- New Hampshire Zone 1: 1, Zone 2: 9, Zone 3: 0
- New Jersey Zone 1: 7, Zone 2: 11, Zone 3: 3
- New Mexico Zone 1: 7, Zone 2: 26, Zone 3: 0
- New York Zone 1: 34, Zone 2: 13, Zone 3: 15
- North Carolina Zone 1: 8, Zone 2: 31, Zone 3: 61
- North Dakota Zone 1: 53, Zone 2: 0, Zone 3: 0
- Ohio Zone 1: 53, Zone 2: 35, Zone 3: 0
- Oklahoma Zone 1: 0, Zone 2: 9, Zone 3: 68
- Oregon Zone 1: 0, Zone 2: 21, Zone 3: 15
- Pennsylvania Zone 1: 49, Zone 2: 17, Zone 3: 1
- Rhode Island Zone 1: 2, Zone 2: 2, Zone 3: 1
- South Carolina Zone 1: 1, Zone 2: 8, Zone 3: 37
- South Dakota Zone 1: 48, Zone 2: 18, Zone 3: 0
- Tennessee Zone 1: 37, Zone 2: 31, Zone 3: 23
- Texas Zone 1: 0, Zone 2: 39, Zone 3: 215
- Utah Zone 1: 7, Zone 2: 22, Zone 3: 0
- Vermont Zone 1: 0, Zone 2: 12, Zone 3: 2
- Virginia Zone 1: 64, Zone 2: 28, Zone 3: 44
- Washington Zone 1: 7, Zone 2: 14, Zone 3: 18
- West Virginia Zone 1: 20, Zone 2: 29, Zone 3: 6
- Wisconsin Zone 1: 28, Zone 2: 44, Zone 3: 0
- Wyoming Zone 1: 21, Zone 2: 2, Zone 3: 0
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