Clark County, WA

ZIP 98606

In ZIP 98606, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Yacolt has 1 contaminant at or over an EPA legal limit; 7 contaminants are above health goals, led by pfos at 8.6× California’s Public Health Goal.
• Nearest Superfund site: Toftdahl Drums, 3.8 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Gunderson LLC (69%), mostly nickel.
• Fine particles (PM2.5) average 7.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 32,110 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 98606

• Superfund sites nearbyA to D
• Factories and industrial sitesA to C
• Oil and gas wellsA
• Parks and nature nearbyB to D
• Air qualityA to B
• Drinking water qualityD to F
• Pesticide useC to D
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC to D

Based on 7 census tracts · compiled September 10, 2026 · how each grade works and its sources

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