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Radon zones in Louisiana

The EPA assigns every county in Louisiana to one of three radon potential zones. No county in Louisiana is in Zone 1. That is a statement about predicted county averages, not about any individual home - homes above the action level are found in all three zones.

64
Counties
0
Zone 1 counties
Predicted average above 4 pCi/L
0
Zone 2 counties
Predicted average 2-4 pCi/L
64
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Louisiana

Every county in Louisiana, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 0Zone 2 · 0Zone 3 · 64

Hover a county · click to open it

County by county

All 64 Louisiana counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Acadia Parish356k11.2%21.9%55.7
Allen Parish322k9.7%21.7%55.8
Ascension Parish3132k6.6%15.4%32.7
Assumption Parish320k10.5%20.5%45.3
Avoyelles Parish338k12.0%23.2%51.7
Beauregard Parish337k8.9%18.5%48.4
Bienville Parish312k13.4%23.8%36.4
Bossier Parish3130k7.6%16.1%43.3
Caddo Parish3226k9.4%18.2%39.6
Calcasieu Parish3204k8.1%17.1%41.7
Caldwell Parish39,38911.7%23.0%39.9
Cameron Parish34,7688.8%17.0% -
Catahoula Parish38,41411.6%22.7%48.2
Claiborne Parish314k14.2%25.7%48.1
Concordia Parish318k12.4%22.8%33.3
De Soto Parish327k10.5%20.7%39.2
East Baton Rouge Parish3448k6.8%14.0%31.3
East Carroll Parish36,82913.3%28.4%70.0
East Feliciana Parish319k8.6%18.3%55.5
Evangeline Parish332k11.1%22.1%50.3
Franklin Parish319k12.5%22.7%51.4
Grant Parish322k9.0%20.1%47.2
Iberia Parish368k10.4%20.4%46.6
Iberville Parish330k8.9%18.9%53.5
Jackson Parish315k11.2%20.6%57.8
Jefferson Davis Parish332k9.9%19.9%55.8
Jefferson Parish3422k7.7%14.9%35.7
Lafayette Parish3250k7.2%16.0%38.2
Lafourche Parish395k9.5%19.1%42.4
LaSalle Parish315k8.4%18.6%39.2
Lincoln Parish348k8.0%15.9%34.4
Livingston Parish3150k7.8%17.1%45.6
Madison Parish39,24613.5%25.5%35.5
Morehouse Parish324k12.3%23.0%47.5
Natchitoches Parish336k9.0%17.7%39.3
Orleans Parish3364k7.3%15.0%30.5
Ouachita Parish3158k8.8%17.9%37.2
Plaquemines Parish322k7.6%16.8%44.8
Pointe Coupee Parish320k10.2%18.5%38.4
Rapides Parish3126k9.2%18.7%37.6
Red River Parish37,35612.3%23.2%47.5
Richland Parish320k11.0%21.4%48.3
Sabine Parish322k11.5%21.1%54.3
St. Bernard Parish344k9.1%20.2%44.6
St. Charles Parish351k7.1%15.1%37.1
St. Helena Parish311k11.5%21.8%41.3
St. James Parish319k8.3%16.5%35.9
St. John the Baptist Parish340k7.8%16.7%41.0
St. Landry Parish381k11.2%22.0%47.4
St. Martin Parish351k9.7%19.7%40.1
St. Mary Parish347k10.8%21.3%47.0
St. Tammany Parish3276k7.2%14.5%33.2
Tangipahoa Parish3138k8.7%18.6%45.9
Tensas Parish33,76414.6%22.8%47.5
Terrebonne Parish3104k9.0%18.8%50.5
Union Parish321k11.9%20.8%47.0
Vermilion Parish357k10.0%20.2%40.8
Vernon Parish346k8.1%18.3%51.5
Washington Parish345k11.3%21.7%53.1
Webster Parish335k12.6%22.8%50.2
West Baton Rouge Parish328k7.2%16.2%37.3
West Carroll Parish39,32311.1%20.0%47.3
West Feliciana Parish315k6.9%17.0%36.8
Winn Parish313k10.3%20.6%46.0

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Other states

Radon zones elsewhere