Radon levels in Louisiana: Low
The model predicts a population-weighted basement average of 1.4 pCi/L (model estimate) across Louisiana's 64 counties - about 24% below the US average of 1.8 pCi/L. Above-ground floors average 0.7 pCi/L.
Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.
0 / 64
EPA Zone 1 counties (0%)
0 / 64
Zone 2 / Zone 3 counties
0
counties predicted ≥ 4 pCi/L
0%
of ZIP codes predicted ≥ 4 pCi/L
Test Louisiana once anyway - radon varies house to house
The predicted basement average here is 1.4 pCi/L, below the EPA's 2 pCi/L "consider fixing" threshold. That's good news for the area - but the EPA still recommends every home be tested, because foundation cracks, soil pockets and ventilation make one house very different from its neighbor. One inexpensive kit settles it.
Monitor link goes to the Airthings store - use code RADONGRADE-10OFF at checkout for 10% off any Airthings monitor.
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What the data says about radon in Louisiana
According to the EPA zone map, 0 of Louisiana's 64 counties are EPA Zone 1 (0%), 0 are Zone 2 and 64 are Zone 3. Every county is in the lowest-potential zone (predicted screening average under 2 pCi/L). Treat the map as a coarse prior: it predates two decades of test data and never replaces a test in your own home.
The 2001-2021 national model predicts a population-weighted basement average of 1.4 pCi/L for Louisiana (low range, 24% below the US average of 1.8). Of the 64 counties with predictions, 0 are predicted at or above 4 pCi/L, 0 in the 2-4 band and 64 below 2. The county range is narrow: from Orleans Parish at 1.20 to Beauregard Parish at 1.55 pCi/L, a spread of only 0.35.
0% of the state's modeled ZIP codes are predicted at or above 2 pCi/L, and 0% at or above the 4 pCi/L action level - below the national shares of 4.2% and 48.7%. No ZIP in the state is predicted above 4 on average - but averages hide individual homes, which is why the EPA still asks everyone to test.
Louisiana counties by predicted radon
Sorted highest to lowest predicted basement average (model estimate). 64 counties.
| County | Predicted basement | Upstairs | Grade | EPA zone | ZIPs |
|---|---|---|---|---|---|
| Beauregard Parish | 1.6 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| East Feliciana Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 6 |
| Grant Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 6 |
| Allen Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| Sabine Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 8 |
| West Baton Rouge Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 4 |
| Jackson Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| St. Tammany Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 13 |
| West Feliciana Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 2 |
| Acadia Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 11 |
| Jefferson Davis Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 6 |
| LaSalle Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 3 |
| Livingston Parish | 1.5 pCi/L | 0.6 | Low | EPA Zone 3 | 9 |
| St. Helena Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 2 |
| Bossier Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 8 |
| Claiborne Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 5 |
| Union Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 7 |
| Webster Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 9 |
| Lincoln Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 5 |
| Vernon Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 8 |
| Red River Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 2 |
| St. Landry Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 9 |
| Tangipahoa Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 12 |
| Winn Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| Bienville Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| East Carroll Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 3 |
| Lafourche Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 10 |
| Pointe Coupee Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 13 |
| Rapides Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 17 |
| Washington Parish | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Avoyelles Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 11 |
| Caldwell Parish | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 3 |
| De Soto Parish | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 8 |
| Iberville Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 8 |
| Plaquemines Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 5 |
| St. Charles Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 9 |
| Evangeline Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 3 |
| Richland Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 2 |
| Vermilion Parish | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 5 |
| Ouachita Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| West Carroll Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 3 |
| Lafayette Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 10 |
| Natchitoches Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 9 |
| Ascension Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 7 |
| Calcasieu Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 12 |
| Catahoula Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| Franklin Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 5 |
| Cameron Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 5 |
| Concordia Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 4 |
| St. James Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 6 |
| St. Martin Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 2 |
| Caddo Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 23 |
| St. John the Baptist Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 5 |
| St. Mary Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 4 |
| Madison Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 2 |
| Morehouse Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 6 |
| Terrebonne Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 10 |
| Assumption Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| Iberia Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 5 |
| East Baton Rouge Parish | 1.3 pCi/L | 0.6 | Low | EPA Zone 3 | 20 |
| Tensas Parish | 1.3 pCi/L | 0.7 | Low | EPA Zone 3 | 3 |
| St. Bernard Parish | 1.3 pCi/L | 0.6 | Low | EPA Zone 3 | 5 |
| Jefferson Parish | 1.2 pCi/L | 0.6 | Low | EPA Zone 3 | 17 |
| Orleans Parish | 1.2 pCi/L | 0.6 | Low | EPA Zone 3 | 17 |
Radon levels in Louisiana cities
The 9 most-populous Louisiana places among the 1,000 largest US cities (Census incorporated places and CDPs), by population. City figures are ZIP-land-weighted means of the model's ZIP predictions (model estimate).
| City | Population | Predicted basement | Upstairs | Grade | ZIPs ≥ 4 |
|---|---|---|---|---|---|
| New Orleans | 364,136 | 1.3 pCi/L | 0.6 | Low | 0% |
| Baton Rouge | 219,573 | 1.3 pCi/L | 0.6 | Low | 0% |
| Shreveport | 177,959 | 1.4 pCi/L | 0.7 | Low | 0% |
| Metairie | 138,481 | 1.2 pCi/L | 0.6 | Low | 0% |
| Lafayette | 121,467 | 1.4 pCi/L | 0.7 | Low | 0% |
| Lake Charles | 79,633 | 1.3 pCi/L | 0.6 | Low | 0% |
| Kenner | 63,333 | 1.2 pCi/L | 0.6 | Low | 0% |
| Bossier City | 62,738 | 1.5 pCi/L | 0.7 | Low | 0% |
| Monroe | 46,616 | 1.4 pCi/L | 0.6 | Low | 0% |
Highest-radon ZIP codes in Louisiana
The 10 Louisiana ZIP codes with the highest predicted basement average (model estimate), out of 462 modeled. A ZIP average is still an area figure - neighboring homes routinely test several pCi/L apart.
| ZIP | County | Predicted basement | Upstairs | Grade |
|---|---|---|---|---|
| 71225 | Ouachita Parish | 1.6 pCi/L | 0.9 | Low |
| 70789 | East Feliciana Parish | 1.6 pCi/L | 0.8 | Low |
| 71006 | Bossier Parish | 1.6 pCi/L | 0.8 | Low |
| 70783 | Pointe Coupee Parish | 1.6 pCi/L | 0.7 | Low |
| 70532 | Jefferson Davis Parish | 1.6 pCi/L | 0.8 | Low |
| 71409 | Rapides Parish | 1.6 pCi/L | 0.8 | Low |
| 71323 | Avoyelles Parish | 1.6 pCi/L | 0.8 | Low |
| 70461 | St. Tammany Parish | 1.6 pCi/L | 0.7 | Low |
| 70739 | East Baton Rouge Parish | 1.6 pCi/L | 0.8 | Low |
| 70443 | Tangipahoa Parish | 1.6 pCi/L | 0.7 | Low |
Louisiana radon questions
- Is radon high in Louisiana?
- Louisiana's population-weighted predicted basement average is 1.4 pCi/L, about 24% below the US average of 1.8. 0 of its 64 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 0 are in the 2-4 "consider fixing" range and 64 are below 2. 0% of Louisiana ZIP codes are predicted at 4 or higher.
- Which Louisiana county has the highest radon?
- Beauregard Parish has the highest predicted basement average in Louisiana at 1.6 pCi/L (EPA Zone 3). The lowest is Orleans Parish at 1.2 pCi/L. These are area figures; individual homes in any county can test far higher.
- How many EPA Zone 1 counties are in Louisiana?
- 0 of Louisiana's 64 counties (0%) are EPA Zone 1 (highest potential), 0 are Zone 2 and 64 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.
- Should I test for radon in Louisiana?
- Yes. Even though Louisiana's predicted average is below 2 pCi/L, the EPA recommends every home be tested - radon varies house to house, and 0% of Louisiana ZIP codes are still predicted at 2 pCi/L or higher.
Louisiana radon program
State programs keep lists of certified testers and mitigators and sometimes run kit programs. We link only pages we could verify, and Louisiana's program page did not respond when we checked, so start from the EPA state radon contacts page. Then read how to test and what mitigation costs.