King County, WA

ZIP 98042

In ZIP 98042, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Welchs Water Association has 2 contaminants at or over an EPA legal limit; 6 contaminants are above health goals, led by arsenic at 5,500× California’s Public Health Goal.
• Nearest Superfund site: Queen City Farms, 4.7 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Puget Sound Coatings (45%), mostly diisocyanates.
• Fine particles (PM2.5) average 6.0 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 98042

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

Based on 15 census tracts · compiled September 10, 2026 · how each grade works and its sources

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