Lake County, CA

ZIP 95423

In ZIP 95423, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Lake County Csa 2 - Spring Valley meets every EPA legal limit; 9 contaminants are above health goals, led by arsenic at 453× California’s Public Health Goal.
• Nearest Superfund site: Sulphur Bank Mercury Mine, 8.9 miles away.
• Largest share of modeled toxic air from industry: Granite Construction Co - Highway 175 (100%), mostly polycyclic aromatic compounds.
• Fine particles (PM2.5) average 7.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 305,708 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 95423

• Superfund sites nearbyF
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyA to C
• Air qualityA to B
• Drinking water qualityC
• Pesticide useD to F
• Neighborhood health statusF
• Past wildfire impactsC to F
• Past flood impactsA
• Noise levelsA
• Radiation signalsA to C

Based on 5 census tracts · compiled October 25, 2026 · how each grade works and its sources

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