St. Tammany Parish, LA

ZIP 70435

In ZIP 70435, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Magnolia-Pruden Creek meets every EPA legal limit; 7 contaminants are above health goals, led by lead at 57× California’s Public Health Goal.
• Nearest Superfund site: Madisonville Creosote Works, 4.5 miles away.
• Largest share of modeled toxic air from industry: International Paper Bogalusa Mill (93%), mostly formaldehyde.
• Fine particles (PM2.5) average 7.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 124,831 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 70435

• Superfund sites nearbyA to D
• Factories and industrial sitesA to D
• Oil and gas wellsA to B
• Parks and nature nearbyB to C
• Air qualityB to C
• Drinking water qualityC to F
• Pesticide useB to F
• Neighborhood health statusC to F
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsB

Based on 9 census tracts · compiled September 10, 2026 · how each grade works and its sources

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