Mariposa County, CA

ZIP 93623

In ZIP 93623, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Cal Am - Oakhurst has 1 contaminant at or over an EPA legal limit; 11 contaminants are above health goals, led by arsenic at 1,850× 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.
• Fine particles (PM2.5) average 11.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 4,047,585 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 93623

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyA to B
• Air qualityF
• Drinking water qualityA to F
• Pesticide useB to F
• Neighborhood health statusB to F
• Past wildfire impactsD to F
• Past flood impactsC
• 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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