Missouri Radon Zone Map
Counties colored by EPA radon zone. Red = Zone 1, Orange = Zone 2, Green = Zone 3.
Highest-Risk Counties
AndrewZone 1 — High
AtchisonZone 1 — High
Buchanan58.3% above action level
Cass27.8% above action level
Clay27.8% above action level
ClintonZone 1 — High
HoltZone 1 — High
IronZone 1 — High
Jackson33.9% above action level
NodawayZone 1 — High
Platte35.7% above action level
All 115 Counties — By Radon Risk
| County | EPA Zone | Tests | % Above 4 pCi/L |
|---|
| Andrew |
High |
4 |
— |
| Atchison |
High |
— |
— |
| Buchanan |
High |
12 |
58.3% |
| Cass |
High |
18 |
27.8% |
| Clay |
High |
36 |
27.8% |
| Clinton |
High |
— |
— |
| Holt |
High |
— |
— |
| Iron |
High |
— |
— |
| Jackson |
High |
115 |
33.9% |
| Nodaway |
High |
— |
— |
| Platte |
High |
14 |
35.7% |
| Adair |
Moderate |
4 |
— |
| Audrain |
Moderate |
4 |
— |
| Barry |
Moderate |
6 |
— |
| Barton |
Moderate |
— |
— |
| Bates |
Moderate |
— |
— |
| Benton |
Moderate |
7 |
— |
| Bollinger |
Moderate |
— |
— |
| Boone |
Moderate |
25 |
24% |
| Caldwell |
Moderate |
— |
— |
| Callaway |
Moderate |
9 |
— |
| Camden |
Moderate |
10 |
40% |
| Cape Girardeau |
Moderate |
8 |
75% |
| Carroll |
Moderate |
— |
— |
| Carter |
Moderate |
— |
— |
| Cedar |
Moderate |
— |
— |
| Chariton |
Moderate |
— |
— |
| Christian |
Moderate |
13 |
38.5% |
| Clark |
Moderate |
— |
— |
| Cole |
Moderate |
12 |
41.7% |
| Cooper |
Moderate |
— |
— |
| Crawford |
Moderate |
4 |
— |
| Dade |
Moderate |
— |
— |
| Dallas |
Moderate |
4 |
— |
| Daviess |
Moderate |
— |
— |
| DeKalb |
Moderate |
— |
— |
| Dent |
Moderate |
— |
— |
| Douglas |
Moderate |
— |
— |
| Franklin |
Moderate |
17 |
35.3% |
| Gasconade |
Moderate |
— |
— |
| Gentry |
Moderate |
— |
— |
| Greene |
Moderate |
42 |
40.5% |
| Grundy |
Moderate |
— |
— |
| Harrison |
Moderate |
— |
— |
| Henry |
Moderate |
4 |
— |
| Hickory |
Moderate |
4 |
— |
| Howard |
Moderate |
— |
— |
| Howell |
Moderate |
5 |
80% |
| Jasper |
Moderate |
17 |
41.2% |
| Jefferson |
Moderate |
32 |
50% |
| Johnson |
Moderate |
9 |
— |
| Knox |
Moderate |
— |
— |
| Laclede |
Moderate |
6 |
— |
| Lafayette |
Moderate |
6 |
— |
| Lawrence |
Moderate |
6 |
— |
| Lewis |
Moderate |
— |
— |
| Lincoln |
Moderate |
8 |
50% |
| Linn |
Moderate |
— |
— |
| Livingston |
Moderate |
— |
— |
| Macon |
Moderate |
— |
— |
| Madison |
Moderate |
— |
— |
| Maries |
Moderate |
— |
— |
| Marion |
Moderate |
6 |
— |
| McDonald |
Moderate |
— |
— |
| Mercer |
Moderate |
— |
— |
| Miller |
Moderate |
4 |
— |
| Moniteau |
Moderate |
— |
— |
| Monroe |
Moderate |
— |
— |
| Montgomery |
Moderate |
— |
— |
| Morgan |
Moderate |
— |
— |
| Newton |
Moderate |
9 |
44.4% |
| Oregon |
Moderate |
— |
— |
| Osage |
Moderate |
— |
— |
| Ozark |
Moderate |
— |
— |
| Perry |
Moderate |
4 |
— |
| Pettis |
Moderate |
10 |
— |
| Phelps |
Moderate |
6 |
— |
| Pike |
Moderate |
— |
— |
| Polk |
Moderate |
4 |
— |
| Pulaski |
Moderate |
4 |
— |
| Putnam |
Moderate |
— |
— |
| Ralls |
Moderate |
— |
— |
| Randolph |
Moderate |
4 |
— |
| Ray |
Moderate |
5 |
— |
| Reynolds |
Moderate |
— |
— |
| Ripley |
Moderate |
— |
— |
| Saline |
Moderate |
4 |
— |
| Schuyler |
Moderate |
— |
— |
| Scotland |
Moderate |
— |
— |
| Shannon |
Moderate |
— |
— |
| Shelby |
Moderate |
— |
— |
| St. Charles |
Moderate |
58 |
50% |
| St. Clair |
Moderate |
— |
— |
| St. Francois |
Moderate |
13 |
38.5% |
| St. Louis |
Moderate |
183 |
34.4% |
| St. Louis |
Moderate |
48 |
35.4% |
| Ste. Genevieve |
Moderate |
4 |
— |
| Stone |
Moderate |
9 |
44.4% |
| Sullivan |
Moderate |
— |
— |
| Taney |
Moderate |
12 |
50% |
| Texas |
Moderate |
— |
— |
| Vernon |
Moderate |
— |
— |
| Warren |
Moderate |
8 |
— |
| Washington |
Moderate |
4 |
— |
| Wayne |
Moderate |
— |
— |
| Webster |
Moderate |
6 |
— |
| Worth |
Moderate |
— |
— |
| Wright |
Moderate |
— |
— |
| Butler |
Low |
7 |
57.1% |
| Dunklin |
Low |
5 |
— |
| Mississippi |
Low |
— |
— |
| New Madrid |
Low |
— |
— |
| Pemiscot |
Low |
— |
— |
| Scott |
Low |
9 |
— |
| Stoddard |
Low |
4 |
— |
Sources: EPA Map of Radon Zones, CDC Environmental Health Tracking Network
Frequently Asked Questions
How many counties in Missouri have high radon risk?
Missouri has 11 counties classified as EPA Zone 1 (high radon risk), 97 as Zone 2 (moderate), and 7 as Zone 3 (low risk).
Is radon a problem in Missouri?
Missouri has 11 high-risk counties where elevated radon is likely. The EPA recommends all homes in Missouri be tested for radon, regardless of which zone they're in.
How do I check radon levels for my Missouri 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.