Snohomish County, WA

ZIP 98270

In ZIP 98270, 4 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, 2.2 miles away.
• Largest share of modeled toxic air from industry: C&D Zodiac Inc (71%), mostly formaldehyde.
• Fine particles (PM2.5) average 6.4 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 98270

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

Based on 13 census tracts · compiled October 25, 2026 · how each grade works and its sources

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