Anchorage County, AK

ZIP 99504

In ZIP 99504, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Riviera Terrace Tc meets every EPA legal limit; 5 contaminants are above health goals, led by arsenic at 1,225× California’s Public Health Goal.
• Nearest Superfund site: Fort Richardson (usarmy), 1.8 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Tesoro - Anchorage Terminal (65%), mostly benzene.
• Fine particles (PM2.5) average 4.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.

Grades for ZIP 99504

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

Based on 12 census tracts · compiled October 25, 2026 · how each grade works and its sources

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