King County, WA

ZIP 98121

In ZIP 98121, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Seattle Public Utilities has 1 contaminant at or over an EPA legal limit; 13 contaminants are above health goals, led by lead at 10× California’s Public Health Goal.
• Nearest Superfund site: Lockheed West Seattle, 1.8 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Alaskan Copper Works (60%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 17,223 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 98121

• Superfund sites nearbyF
• Factories and industrial sitesF
• Oil and gas wellsA to B
• Parks and nature nearbyD to F
• Air qualityB to C
• Drinking water qualityD
• Pesticide useB
• Neighborhood health statusA to B
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsD
• Radiation signalsB

Based on 7 census tracts · compiled September 10, 2026 · how each grade works and its sources

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