Honolulu County, HI

ZIP 96816

In ZIP 96816, none of the 12 things we check has a part graded D or F.

• Drinking water: Hnl-Windward-Pearl Harbor meets every EPA legal limit; 8 contaminants are above health goals, led by arsenic at 250× California’s Public Health Goal.
• Closer to Superfund sites than 59% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Hffc Airport Fuel Farm (90%), mostly chromium.
• Fine particles (PM2.5) average 3.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.

Grades for ZIP 96816

• Superfund sites nearbyA to C
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityC
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsA

Based on 23 census tracts · compiled October 25, 2026 · how each grade works and its sources

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