San Mateo County, CA

ZIP 94404

In ZIP 94404, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Redwood City meets every EPA legal limit; 7 contaminants are above health goals, led by chloroform at 103× 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: Tesla Inc. (59%), mostly cobalt compounds.
• Fine particles (PM2.5) average 9.1 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 94404

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

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

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