Chugach County, AK

ZIP 99677

In ZIP 99677, none of the 12 things we check has a part graded D or F.

• Drinking water: Tatitlek Water System meets every EPA legal limit; 5 contaminants are above health goals, led by chloroform at 168× 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: Petro Star Valdez Refinery (80%), mostly polycyclic aromatic compounds.
• Fine particles (PM2.5) average 3.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.

Grades for ZIP 99677

• Superfund sites nearbyA
• Factories and industrial sitesC
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityA to C
• Neighborhood health statusA
• Past wildfire impactsA
• Past flood impactsA

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

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