Sonoma County, CA

ZIP 94515

In ZIP 94515, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Calistoga Farm Worker Center has 1 contaminant at or over an EPA legal limit; 1 contaminant is above health goals, led by arsenic at 8,700× 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 (52%), mostly polycyclic aromatic compounds.
• Fine particles (PM2.5) average 7.5 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 94515

• Superfund sites nearbyA
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyA to C
• Air qualityA to C
• Drinking water qualityB to F
• Pesticide useD to F
• Neighborhood health statusB to D
• Past wildfire impactsF
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsB to C

Based on 7 census tracts · compiled October 25, 2026 · how each grade works and its sources

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