Skagit County, WA

ZIP 98257

In ZIP 98257, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Snee-Oosh Land Co meets every EPA legal limit; 3 contaminants are above health goals, led by arsenic at 1,350× California’s Public Health Goal.
• Nearest Superfund site: Naval Air Station, Whidbey Island (ault Field), 8.4 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Hf Sinclair Puget Sound Refining LLC (64%), mostly sulfuric acid.
• Fine particles (PM2.5) average 5.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 609,556 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 98257

• Superfund sites nearbyC to D
• Factories and industrial sitesA to B
• Oil and gas wellsA to B
• Parks and nature nearbyB to C
• Air qualityA
• Drinking water qualityB to C
• Pesticide useD to F
• Neighborhood health statusD to F
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsA

Based on 3 census tracts · compiled October 25, 2026 · how each grade works and its sources

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