Island County, WA

ZIP 98278

In ZIP 98278, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Oak Harbor City Of meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 12× California’s Public Health Goal.
• Nearest Superfund site: Naval Air Station, Whidbey Island (ault Field), 0.2 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Hf Sinclair Puget Sound Refining LLC (59%), mostly sulfuric acid.
• Fine particles (PM2.5) average 5.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 9,179 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 98278

• Superfund sites nearbyF
• Factories and industrial sitesB
• Oil and gas wellsB
• Parks and nature nearbyD
• Air qualityA
• Drinking water qualityC to D
• Pesticide useD
• Neighborhood health statusB
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…