Snohomish County, WA

ZIP 98204

In ZIP 98204, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mukilteo Water & Wastewater Distr meets every EPA legal limit; 4 contaminants are above health goals, led by chloroform at 96× California’s Public Health Goal.
• Nearest Superfund site: Tulalip Landfill, 9.0 miles away.
• Largest share of modeled toxic air from industry: Puget Sound Coatings (24%), mostly diisocyanates.
• Fine particles (PM2.5) average 6.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 36,222 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 98204

• Superfund sites nearbyA
• Factories and industrial sitesC to D
• Oil and gas wellsB to C
• Parks and nature nearbyC to D
• Air qualityA
• Drinking water qualityC
• Pesticide useB to D
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to F
• Radiation signalsA

Based on 12 census tracts · compiled October 25, 2026 · how each grade works and its sources

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