Honolulu County, HI

ZIP 96821

In ZIP 96821, 1 of the 12 things we check have at least one part graded D or F.

• Drinking water: Hnl-Windward-Pearl Harbor meets every EPA legal limit; 12 contaminants are above health goals, led by lead at 2.8× California’s Public Health Goal.
• Closer to Superfund sites than 0% 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 96821

• Superfund sites nearbyA
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Air qualityA
• Drinking water qualityD
• Neighborhood health statusB
• Past wildfire impactsA
• Past flood impactsA

Based on 7 census tracts · compiled September 10, 2026 · how each grade works and its sources

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