Dillingham County, AK

ZIP 99628

In ZIP 99628, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Dillingham Water System has 1 contaminant at or over an EPA legal limit; 6 contaminants are above health goals, led by arsenic at 5,192× 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.
• Fine particles (PM2.5) average 3.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.

Grades for ZIP 99628

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsA
• Air qualityA
• Drinking water qualityA to F
• Neighborhood health statusC to D
• Past wildfire impactsA
• Past flood impactsA
• Radiation signalsC

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

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