St. Tammany Parish, LA

ZIP 70457

In ZIP 70457, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Lake Ramsey meets every EPA legal limit; 9 contaminants are above health goals, led by lead at 125× California’s Public Health Goal.
• Nearest Superfund site: Madisonville Creosote Works, 9.4 miles away.
• Largest share of modeled toxic air from industry: International Paper Bogalusa Mill (95%), mostly formaldehyde.
• Fine particles (PM2.5) average 7.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 4,970 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 70457

• Superfund sites nearbyA
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityB
• Drinking water qualityD to F
• Pesticide useC
• Neighborhood health statusD
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsB

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…