King County, WA

ZIP 98158

In ZIP 98158, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Highline Water District meets every EPA legal limit; 10 contaminants are above health goals, led by pfos at 1.8× California’s Public Health Goal.
• Nearest Superfund site: Western Processing Co., Inc., 3.2 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Puget Sound Coatings (57%), mostly diisocyanates.
• Fine particles (PM2.5) average 7.1 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 98158

• Superfund sites nearbyF
• Factories and industrial sitesD
• Oil and gas wellsB
• Parks and nature nearbyC
• Air qualityB
• Drinking water qualityB to C
• Pesticide useA
• Neighborhood health statusB
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsF
• Radiation signalsA

Based on 1 census tract · compiled October 25, 2026 · how each grade works and its sources

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