Plaquemines Parish, LA

ZIP 70091

In ZIP 70091, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Port Sulphur Water District meets every EPA legal limit; 16 contaminants are above health goals, led by pfos at 3.8× 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: St Charles Operations (Taft/Star) Union Carbide Corp (26%), mostly ethylene oxide.
• Fine particles (PM2.5) average 6.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 4,556 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 70091

• Superfund sites nearbyA
• Factories and industrial sitesB to C
• Oil and gas wellsF
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityD to F
• Pesticide useD to F
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsA to C
• Noise levelsA

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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