Marin County, CA

ZIP 94947

In ZIP 94947, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Nicasio Valley Ranch Mutual has 1 contaminant at or over an EPA legal limit; 10 contaminants are above health goals, led by arsenic at 4,747× 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 Richmond Refinery (37%), mostly acrylamide.
• Fine particles (PM2.5) average 7.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 3,141 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 94947

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

Based on 10 census tracts · compiled October 25, 2026 · how each grade works and its sources

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