Sonoma County, CA

ZIP 95431

In ZIP 95431, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Valley Of The Moon Water District has 2 contaminants at or over an EPA legal limit; 14 contaminants are above health goals, led by pfos at 3.7× 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: Valero Refining Co-Cali Fornia Benicia Refinery (49%), mostly nickel compounds.
• Fine particles (PM2.5) average 7.2 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 95431

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

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

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