San Mateo County, CA

ZIP 94066

In ZIP 94066, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Westborough Water District meets every EPA legal limit; 7 contaminants are above health goals, led by bromodichloromethane at 68× California’s Public Health Goal.
• Nearest Superfund site: Hunters Point Naval Shipyard, 6.8 miles away.
• Largest share of modeled toxic air from industry: Tesla Inc. (52%), mostly cobalt compounds.
• Fine particles (PM2.5) average 8.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 38,964 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 94066

• Superfund sites nearbyA to D
• Factories and industrial sitesA to F
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityB to D
• Drinking water qualityC
• Pesticide useB
• Neighborhood health statusA
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to F
• Radiation signalsB

Based on 12 census tracts · compiled October 25, 2026 · how each grade works and its sources

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