Mendocino County, CA

ZIP 95490

In ZIP 95490, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Laytonville County Water District has 1 contaminant at or over an EPA legal limit; 9 contaminants are above health goals, led by lead at 48× California’s Public Health Goal.
• Closer to Superfund sites than 58% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Granite Construction Co - Highway 175 (100%), mostly polycyclic aromatic compounds.
• Fine particles (PM2.5) average 12.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 471,607 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 95490

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

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

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