Ventura County, CA

ZIP 91320

In ZIP 91320, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Naval Base Ventura County, Port Hueneme meets every EPA legal limit; 9 contaminants are above health goals, led by lead at 35× 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: Chevron Products Co. Div Of Chevron USA Inc. (75%), mostly chromium compounds.
• Fine particles (PM2.5) average 8.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 2,496,015 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 91320

• Superfund sites nearbyA
• Factories and industrial sitesC
• Oil and gas wellsB to F
• Parks and nature nearbyB to D
• Air qualityB to D
• Drinking water qualityC to F
• Pesticide useF
• Neighborhood health statusA to C
• Past wildfire impactsF
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC to D

Based on 12 census tracts · compiled September 10, 2026 · how each grade works and its sources

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