Lewis County, WA

ZIP 98542

In ZIP 98542, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Salkum Water Supply meets every EPA legal limit; 2 contaminants are above health goals, led by lead at 87× California’s Public Health Goal.
• Closer to Superfund sites than 55% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Imperial Group Manufacturing (69%), mostly chromium.
• Fine particles (PM2.5) average 5.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 26,101 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 98542

• Superfund sites nearbyA to C
• Factories and industrial sitesA
• Oil and gas wellsA to D
• Parks and nature nearbyB to C
• Air qualityA
• Drinking water qualityC to F
• Pesticide useD to F
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsB

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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