King County, WA

ZIP 98023

In ZIP 98023, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Milton City Of has 1 contaminant at or over an EPA legal limit; 11 contaminants are above health goals, led by lead at 33× California’s Public Health Goal.
• Nearest Superfund site: Commencement Bay, Near Shore/tide Flats, 6.6 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Puget Sound Coatings (35%), mostly diisocyanates.
• Fine particles (PM2.5) average 6.2 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 98023

• Superfund sites nearbyD to F
• Factories and industrial sitesD
• Oil and gas wellsA to B
• Parks and nature nearbyD
• Air qualityA
• Drinking water qualityD to F
• Pesticide useB to C
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsB

Based on 11 census tracts · compiled September 10, 2026 · how each grade works and its sources

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