King County, WA

ZIP 98027

In ZIP 98027, 3 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, 1.0 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Alaskan Copper Works (33%), mostly chromium compounds.
• 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 98027

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

Based on 14 census tracts · compiled September 10, 2026 · how each grade works and its sources

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