Humboldt County, CA

ZIP 95570

In ZIP 95570, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Westhaven C.s.d. has 1 contaminant at or over an EPA legal limit; 13 contaminants are above health goals, led by pfos at 5.6× 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: Pg&E Humboldt Bay Power Plant (100%), mostly acetaldehyde.
• Fine particles (PM2.5) average 8.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 15,274 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 95570

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

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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