San Luis Obispo County, CA

ZIP 93461

In ZIP 93461, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Green River Mutual Water Co. has 1 contaminant at or over an EPA legal limit; 5 contaminants are above health goals, led by arsenic at 869× 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 (82%), mostly asbestos (friable).
• Fine particles (PM2.5) average 8.1 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 93461

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

Based on 3 census tracts · compiled October 25, 2026 · how each grade works and its sources

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