Aleutians West County, AK

ZIP 99660

In ZIP 99660, 1 of the 12 things we check have at least one part graded D or F.

• Drinking water: Adak Utilities meets every EPA legal limit; 6 contaminants are above health goals, led by bromodichloromethane at 194× California’s Public Health Goal.
• Closer to Superfund sites than 95% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Fine particles (PM2.5) average 3.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.

Grades for ZIP 99660

• Superfund sites nearbyF
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityC
• Neighborhood health statusC

Based on 1 census tract · compiled October 25, 2026 · how each grade works and its sources

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