Santa Clara County, CA

ZIP 95050

In ZIP 95050, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Castlewood Domestic Water System meets every EPA legal limit; 4 contaminants are above health goals, led by lead at 121× California’s Public Health Goal.
• Nearest Superfund site: Intersil Inc./siemens Components, 2.4 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Tesla Inc. (67%), 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 162,482 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 95050

• Superfund sites nearbyF
• Factories and industrial sitesF
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityD to F
• Drinking water qualityC to D
• Pesticide useB to D
• Neighborhood health statusA
• Past wildfire impactsC to F
• Past flood impactsA
• Noise levelsA to F
• Radiation signalsB to C

Based on 11 census tracts · compiled October 25, 2026 · how each grade works and its sources

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