Sonoma County, CA

ZIP 95403

In ZIP 95403, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: California-American Larkfield (Puc) has 1 contaminant at or over an EPA legal limit; 13 contaminants are above health goals, led by pfos at 4.8× 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: Nick Barbieri Trucking LLC (70%), mostly xylene (mixed isomers).
• Fine particles (PM2.5) average 8.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 1,321,118 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 95403

• Superfund sites nearbyA
• Factories and industrial sitesB to C
• Oil and gas wellsA
• Parks and nature nearbyB to D
• Air qualityA to D
• Drinking water qualityA to F
• Pesticide useF
• Neighborhood health statusB to C
• Past wildfire impactsC to F
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsB to C

Based on 15 census tracts · compiled September 10, 2026 · how each grade works and its sources

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