Honolulu County, HI

ZIP 96797

In ZIP 96797, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mililani meets every EPA legal limit; 5 contaminants are above health goals, led by vanadium at 2× California’s Public Health Goal.
• Nearest Superfund site: Pearl Harbor Naval Complex, 1.7 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Hawaiian Electric Co Inc Waiau Generating Station (55%), mostly sulfuric acid.
• Fine particles (PM2.5) average 3.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.

Grades for ZIP 96797

• Superfund sites nearbyF
• Factories and industrial sitesB to C
• Oil and gas wellsA
• Air qualityA
• Drinking water qualityB to F
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsA

Based on 24 census tracts · compiled September 10, 2026 · how each grade works and its sources

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