King County, WA

ZIP 98001

In ZIP 98001, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Milton City Of meets every EPA legal limit; 10 contaminants are above health goals, led by pfos at 2× California’s Public Health Goal.
• Nearest Superfund site: Midway Landfill, 4.2 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Puget Sound Coatings (40%), mostly diisocyanates.
• Fine particles (PM2.5) average 6.4 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 98001

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

Based on 14 census tracts · compiled October 25, 2026 · how each grade works and its sources

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