Radon zones in Louisiana
Last updated
EPA’s Map of Radon Zones places 64 Louisiana parishes in its three radon potential zones: 0 in Zone 1 (highest), 0 in Zone 2 (moderate), and 64 in Zone 3 (low).
What this means for Louisiana homes
Most Louisiana parishes fall in Zone 3. EPA predicts lower average indoor levels (below 2 pCi/L) across much of Louisiana. That does not mean your home is low: EPA notes that elevated levels are found in Zone 3 counties too.
EPA’s guidance is the same everywhere: test your home, fix it if the level is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L. The zone map is from 1993 and should not be used to decide whether a single home needs testing.
Louisiana radon program
EPA lists the following state contact for Louisiana: the state radon program. Website: deq.louisiana.gov/faq/category/32. State programs can tell you about local testing data, free or discounted test kits, disclosure rules for home sales, and credentialed radon professionals.
Louisiana parishes and their EPA radon zones
| Parish | EPA radon zone |
|---|---|
| Acadia Parish | Zone 3 |
| Allen Parish | Zone 3 |
| Ascension Parish | Zone 3 |
| Assumption Parish | Zone 3 |
| Avoyelles Parish | Zone 3 |
| Beauregard Parish | Zone 3 |
| Bienville Parish | Zone 3 |
| Bossier Parish | Zone 3 |
| Caddo Parish | Zone 3 |
| Calcasieu Parish | Zone 3 |
| Caldwell Parish | Zone 3 |
| Cameron Parish | Zone 3 |
| Catahoula Parish | Zone 3 |
| Claiborne Parish | Zone 3 |
| Concordia Parish | Zone 3 |
| De Soto Parish | Zone 3 |
| East Baton Rouge Parish | Zone 3 |
| East Carroll Parish | Zone 3 |
| East Feliciana Parish | Zone 3 |
| Evangeline Parish | Zone 3 |
| Franklin Parish | Zone 3 |
| Grant Parish | Zone 3 |
| Iberia Parish | Zone 3 |
| Iberville Parish | Zone 3 |
| Jackson Parish | Zone 3 |
| Jefferson Davis Parish | Zone 3 |
| Jefferson Parish | Zone 3 |
| Lafayette Parish | Zone 3 |
| Lafourche Parish | Zone 3 |
| LaSalle Parish | Zone 3 |
| Lincoln Parish | Zone 3 |
| Livingston Parish | Zone 3 |
| Madison Parish | Zone 3 |
| Morehouse Parish | Zone 3 |
| Natchitoches Parish | Zone 3 |
| Orleans Parish | Zone 3 |
| Ouachita Parish | Zone 3 |
| Plaquemines Parish | Zone 3 |
| Pointe Coupee Parish | Zone 3 |
| Rapides Parish | Zone 3 |
| Red River Parish | Zone 3 |
| Richland Parish | Zone 3 |
| Sabine Parish | Zone 3 |
| St. Bernard Parish | Zone 3 |
| St. Charles Parish | Zone 3 |
| St. Helena Parish | Zone 3 |
| St. James Parish | Zone 3 |
| St. John the Baptist Parish | Zone 3 |
| St. Landry Parish | Zone 3 |
| St. Martin Parish | Zone 3 |
| St. Mary Parish | Zone 3 |
| St. Tammany Parish | Zone 3 |
| Tangipahoa Parish | Zone 3 |
| Tensas Parish | Zone 3 |
| Terrebonne Parish | Zone 3 |
| Union Parish | Zone 3 |
| Vermilion Parish | Zone 3 |
| Vernon Parish | Zone 3 |
| Washington Parish | Zone 3 |
| Webster Parish | Zone 3 |
| West Baton Rouge Parish | Zone 3 |
| West Carroll Parish | Zone 3 |
| West Feliciana Parish | Zone 3 |
| Winn Parish | Zone 3 |
County names follow the 2020 Census. Zones from the EPA Map of Radon Zones (text version). Rows marked “zone of” use the zone EPA gave the predecessor or surrounding county.
Next steps: read how to test your home, check a result with the level calculator, or look up a single address by ZIP code.