St. Mary Parish, LA

ZIP 70523

In ZIP 70523, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Water & Sewer Commission 4 Of St Mary meets every EPA legal limit; 14 contaminants are above health goals, led by pfos at 2.7× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Cabot Corp Canal Plant (68%), mostly hydrogen sulfide.
• Fine particles (PM2.5) average 8.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 128,132 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 70523

• Superfund sites nearbyA
• Factories and industrial sitesB
• Oil and gas wellsF
• Parks and nature nearbyC
• Air qualityD
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusF
• 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

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