San Luis Obispo County, CA

ZIP 93453

In ZIP 93453, 4 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.
• 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: Clean Harbors Buttonwillow LLC (100%), mostly asbestos (friable).
• Fine particles (PM2.5) average 6.2 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 93453

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

Based on 5 census tracts · compiled September 10, 2026 · how each grade works and its sources

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