Snohomish County, WA

ZIP 98021

In ZIP 98021, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Cross Valley Water District meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 13× California’s Public Health Goal.
• 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: Romac Industries Inc (27%), mostly chromium.
• Fine particles (PM2.5) average 6.3 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 98021

• Superfund sites nearbyA
• Factories and industrial sitesC to D
• Oil and gas wellsC to D
• Parks and nature nearbyD
• Air qualityA
• Drinking water qualityC to D
• Pesticide useC to D
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsB

Based on 11 census tracts · compiled September 10, 2026 · how each grade works and its sources

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