San Mateo County, CA

ZIP 94128

In ZIP 94128, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Millbrae meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 62× California’s Public Health Goal.
• Nearest Superfund site: Hunters Point Naval Shipyard, 5.3 miles away.
• Largest share of modeled toxic air from industry: Tesla Inc. (48%), mostly cobalt compounds.
• Fine particles (PM2.5) average 8.2 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 94128

• Superfund sites nearbyD
• Factories and industrial sitesA to C
• Oil and gas wellsA
• Parks and nature nearbyF
• Air qualityC to D
• Drinking water qualityD to F
• Pesticide useC
• Neighborhood health statusA
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsD to F
• Radiation signalsC

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

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