Matanuska-Susitna County, AK

ZIP 99688

In ZIP 99688, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Westwood Water Company Inc meets every EPA legal limit; 5 contaminants are above health goals, led by arsenic at 1,517× 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: Tesoro - Anchorage Terminal (76%), mostly benzene.
• Fine particles (PM2.5) average 4.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.

Grades for ZIP 99688

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsA
• Air qualityA
• Drinking water qualityC to D
• Neighborhood health statusD
• Radiation signalsC

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

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