Matanuska-Susitna County, AK

ZIP 99729

In ZIP 99729, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Denali - Rock Creek Hq. has 1 contaminant at or over an EPA legal limit; 4 contaminants are above health goals, led by arsenic at 126× California’s Public Health Goal.
• Closer to Superfund sites than 53% 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 (89%), mostly benzene.
• Fine particles (PM2.5) average 4.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.

Grades for ZIP 99729

• Superfund sites nearbyA to C
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityA to D
• Neighborhood health statusB to F
• Past wildfire impactsF
• Past flood impactsA
• Radiation signalsB

Based on 2 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…