Marin County, CA

ZIP 94941

In ZIP 94941, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Nps Ggnra meets every EPA legal limit; 7 contaminants are above health goals, led by lead at 36× California’s Public Health Goal.
• Nearest Superfund site: United Heckathorn Co., 7.0 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Bio-Rad Laboratories Inc (47%), mostly acrylamide.
• Fine particles (PM2.5) average 7.7 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 94941

• Superfund sites nearbyA to C
• Factories and industrial sitesA to C
• Oil and gas wellsA
• Parks and nature nearbyB to F
• Air qualityA to C
• Drinking water qualityD to F
• Pesticide useB to C
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to C

Based on 9 census tracts · compiled September 10, 2026 · how each grade works and its sources

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