Yukon-Koyukuk County, AK

ZIP 99760

In ZIP 99760, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: University Of Alaska - Fairbanks has 2 contaminants at or over an EPA legal limit; 9 contaminants are above health goals, led by lead at 38× California’s Public Health Goal.
• Nearest Superfund site: Fort Wainwright, 9.0 miles away.
• Largest share of modeled toxic air from industry: Fort Knox Mine (65%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.

Grades for ZIP 99760

• Superfund sites nearbyC to F
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Air qualityA to C
• Drinking water qualityC to F
• Neighborhood health statusA to D
• Past wildfire impactsA to F
• Past flood impactsA
• Radiation signalsC

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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