Indiana Radon Zone Map
Counties colored by EPA radon zone. Red = Zone 1, Orange = Zone 2, Green = Zone 3.
Highest-Risk Counties
AdamsZone 1 — High
Allen38.8% above action level
Bartholomew33.3% above action level
BentonZone 1 — High
BlackfordZone 1 — High
Boone44.4% above action level
CarrollZone 1 — High
CassZone 1 — High
Clark47.1% above action level
ClintonZone 1 — High
DeKalbZone 1 — High
DecaturZone 1 — High
+45 more
All 92 Counties — By Radon Risk
| County | EPA Zone | Tests | % Above 4 pCi/L |
|---|
| Adams |
High |
6 |
— |
| Allen |
High |
67 |
38.8% |
| Bartholomew |
High |
12 |
33.3% |
| Benton |
High |
— |
— |
| Blackford |
High |
— |
— |
| Boone |
High |
9 |
44.4% |
| Carroll |
High |
4 |
— |
| Cass |
High |
7 |
— |
| Clark |
High |
17 |
47.1% |
| Clinton |
High |
6 |
— |
| DeKalb |
High |
10 |
— |
| Decatur |
High |
4 |
— |
| Delaware |
High |
21 |
38.1% |
| Elkhart |
High |
27 |
40.7% |
| Fayette |
High |
5 |
— |
| Fountain |
High |
— |
— |
| Fulton |
High |
4 |
— |
| Grant |
High |
12 |
33.3% |
| Hamilton |
High |
42 |
26.2% |
| Hancock |
High |
13 |
46.2% |
| Harrison |
High |
7 |
— |
| Hendricks |
High |
24 |
33.3% |
| Henry |
High |
11 |
36.4% |
| Howard |
High |
18 |
38.9% |
| Huntington |
High |
8 |
50% |
| Jay |
High |
— |
— |
| Jennings |
High |
4 |
— |
| Johnson |
High |
23 |
47.8% |
| Kosciusko |
High |
16 |
31.2% |
| LaGrange |
High |
5 |
— |
| Lawrence |
High |
9 |
44.4% |
| Madison |
High |
23 |
47.8% |
| Marion |
High |
145 |
33.8% |
| Marshall |
High |
8 |
— |
| Miami |
High |
5 |
80% |
| Monroe |
High |
19 |
31.6% |
| Montgomery |
High |
7 |
— |
| Noble |
High |
8 |
62.5% |
| Orange |
High |
— |
— |
| Putnam |
High |
6 |
66.7% |
| Randolph |
High |
5 |
— |
| Rush |
High |
— |
— |
| Scott |
High |
4 |
— |
| Shelby |
High |
10 |
— |
| St. Joseph |
High |
47 |
42.6% |
| Steuben |
High |
6 |
— |
| Tippecanoe |
High |
26 |
38.5% |
| Tipton |
High |
5 |
— |
| Union |
High |
— |
— |
| Vermillion |
High |
— |
— |
| Wabash |
High |
6 |
83.3% |
| Warren |
High |
— |
— |
| Washington |
High |
4 |
— |
| Wayne |
High |
10 |
— |
| Wells |
High |
5 |
— |
| White |
High |
5 |
— |
| Whitley |
High |
7 |
57.1% |
| Brown |
Moderate |
— |
— |
| Clay |
Moderate |
5 |
— |
| Crawford |
Moderate |
— |
— |
| Daviess |
Moderate |
5 |
— |
| Dearborn |
Moderate |
12 |
33.3% |
| Dubois |
Moderate |
8 |
— |
| Floyd |
Moderate |
15 |
40% |
| Franklin |
Moderate |
— |
— |
| Gibson |
Moderate |
6 |
— |
| Greene |
Moderate |
7 |
85.7% |
| Jackson |
Moderate |
6 |
66.7% |
| Jasper |
Moderate |
6 |
— |
| Jefferson |
Moderate |
4 |
— |
| Knox |
Moderate |
8 |
— |
| LaPorte |
Moderate |
21 |
42.9% |
| Lake |
Moderate |
80 |
46.2% |
| Martin |
Moderate |
4 |
— |
| Morgan |
Moderate |
13 |
38.5% |
| Newton |
Moderate |
— |
— |
| Ohio |
Moderate |
— |
— |
| Owen |
Moderate |
— |
— |
| Parke |
Moderate |
— |
— |
| Perry |
Moderate |
— |
— |
| Pike |
Moderate |
— |
— |
| Porter |
Moderate |
28 |
35.7% |
| Posey |
Moderate |
5 |
— |
| Pulaski |
Moderate |
— |
— |
| Ripley |
Moderate |
5 |
— |
| Spencer |
Moderate |
4 |
— |
| Starke |
Moderate |
4 |
— |
| Sullivan |
Moderate |
— |
— |
| Switzerland |
Moderate |
— |
— |
| Vanderburgh |
Moderate |
32 |
31.2% |
| Vigo |
Moderate |
18 |
38.9% |
| Warrick |
Moderate |
10 |
40% |
Sources: EPA Map of Radon Zones, CDC Environmental Health Tracking Network
Frequently Asked Questions
How many counties in Indiana have high radon risk?
Indiana has 57 counties classified as EPA Zone 1 (high radon risk), 35 as Zone 2 (moderate), and 0 as Zone 3 (low risk).
Is radon a problem in Indiana?
Indiana has 57 high-risk counties where elevated radon is likely. The EPA recommends all homes in Indiana be tested for radon, regardless of which zone they're in.
How do I check radon levels for my Indiana address?
Enter your ZIP code in the search box above to see your county's EPA radon zone and available testing data. For your specific home's radon level, you'll need a radon test kit.