Honolulu County, HI

ZIP 96789

In ZIP 96789, 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: Schofield Barracks (usarmy), 2.8 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Hffc Airport Fuel Farm (47%), mostly chromium.
• Fine particles (PM2.5) average 3.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.

Grades for ZIP 96789

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

Based on 18 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…