King County, WA

ZIP 98006

In ZIP 98006, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Issaquah Water System has 1 contaminant at or over an EPA legal limit; 13 contaminants are above health goals, led by pfoa at 2,971× California’s Public Health Goal.
• Nearest Superfund site: Quendall Terminals, 2.4 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Alaskan Copper Works (42%), mostly chromium compounds.
• Fine particles (PM2.5) average 6.7 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 98006

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

Based on 13 census tracts · compiled September 10, 2026 · how each grade works and its sources

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