Snohomish County, WA

ZIP 98258

In ZIP 98258, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Snohomish City Of meets every EPA legal limit; 5 contaminants are above health goals, led by chloroform at 103× California’s Public Health Goal.
• Nearest Superfund site: Tulalip Landfill, 4.1 miles away.
• Largest share of modeled toxic air from industry: Granite Construction Co (35%), mostly polycyclic aromatic compounds.
• Fine particles (PM2.5) average 5.7 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 98258

• Superfund sites nearbyA to D
• Factories and industrial sitesA to B
• Oil and gas wellsA to C
• Parks and nature nearbyA to D
• Air qualityA
• Drinking water qualityA to C
• Pesticide useB to C
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to C
• Radiation signalsA

Based on 16 census tracts · compiled October 25, 2026 · how each grade works and its sources

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