San Luis Obispo County, CA

ZIP 93446

In ZIP 93446, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Atascadero State Hospital has 1 contaminant at or over an EPA legal limit; 13 contaminants are above health goals, led by pfos at 14× California’s Public Health Goal.
• Nearest Superfund site: Klau/buena Vista Mine, 3.5 miles away.
• Largest share of modeled toxic air from industry: Chemical Waste Management Inc (100%), mostly asbestos (friable).
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 901,427 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 93446

• Superfund sites nearbyA to F
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyB to F
• Air qualityA to B
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusB to D
• Past wildfire impactsA to F
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsC to D

Based on 15 census tracts · compiled September 10, 2026 · how each grade works and its sources

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