Matanuska-Susitna County, AK

ZIP 99652

In ZIP 99652, 3 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 55% 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 (59%), 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 99652

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

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

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