San Juan County, WA

ZIP 98250

In ZIP 98250, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Hannah Heights Owners Association has 2 contaminants at or over an EPA legal limit; 14 contaminants are above health goals, led by pfhxs at 484× California Notification Level.
• 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: Hf Sinclair Puget Sound Refining LLC (49%), mostly sulfuric acid.
• Fine particles (PM2.5) average 4.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 5,492 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 98250

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsA to B
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityC to F
• Pesticide useD to F
• Neighborhood health statusC to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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