St. Martin Parish, LA

ZIP 70517

In ZIP 70517, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: River Ridge Estates Water System has 1 contaminant at or over an EPA legal limit; 9 contaminants are above health goals, led by arsenic at 4,040× 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: Catalyst Recovery Of Louisiana LLC (62%), mostly cobalt compounds.
• Fine particles (PM2.5) average 7.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 135,021 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 70517

• Superfund sites nearbyA
• Factories and industrial sitesB to D
• Oil and gas wellsB to F
• Parks and nature nearbyB to D
• Air qualityC to D
• Drinking water qualityD to F
• Pesticide useD to F
• Neighborhood health statusD to F
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsB to C

Based on 14 census tracts · compiled September 10, 2026 · how each grade works and its sources

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