King County, WA

ZIP 98050

In ZIP 98050, 1 of the 12 things we check have at least one part graded D or F.

• Drinking water: Sammamish Plateau Water & Sewer has 1 contaminant at or over an EPA legal limit; 15 contaminants are above health goals, led by pfos at 7× California’s Public Health Goal.
• Nearest Superfund site: Queen City Farms, 8.5 miles away.
• Largest share of modeled toxic air from industry: Western Pneumatic Tube Co LLC (36%), mostly 1-bromopropane.
• Fine particles (PM2.5) average 5.8 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 98050

• Superfund sites nearbyC
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityD to F
• Pesticide useB
• Neighborhood health statusA
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsB

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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