Siskiyou County, CA

ZIP 96050

In ZIP 96050, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Yreka, City Of meets every EPA legal limit; 7 contaminants are above health goals, led by pfos at 3.3× California’s Public Health Goal.
• Closer to Superfund sites than 54% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Roseburg Forest Products Co. - Medford Mdf (89%), mostly formaldehyde.
• Fine particles (PM2.5) average 8.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 130,699 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 96050

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

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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