San Mateo County, CA
ZIP 94025
In ZIP 94025, 7 of the 12 things we check have at least one part graded D or F.
- Drinking water: California Water Service - Bear Gulch has 1 contaminant at or over an EPA legal limit; 14 contaminants are above health goals, led by pfos at 7.8× California’s Public Health Goal.
- Nearest Superfund site: Hewlett-Packard (620-640 Page Mill Road), 3.0 miles away (3 within 10 miles).
- Largest share of modeled toxic air from industry: Tesla Inc. (83%), mostly cobalt compounds.
- Fine particles (PM2.5) average 8.8 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 94025
- Superfund sites nearbyD to F
- Factories and industrial sitesC to F
- Oil and gas wellsA
- Parks and nature nearbyB to D
- Air qualityA to F
- Drinking water qualityC to D
- Pesticide useB to D
- Neighborhood health statusA to B
- Past wildfire impactsA
- Past flood impactsA
- Noise levelsA to D
- Radiation signalsB to C
Based on 14 census tracts · compiled October 25, 2026 · how each grade works and its sources
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