Chelan County, WA

ZIP 98816

In ZIP 98816, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Twisp Town Of meets every EPA legal limit; 2 contaminants are above health goals, led by arsenic at 134× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Pacific Aerospace & Electronics (100%), mostly 1-bromopropane.
• Fine particles (PM2.5) average 7.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 813,147 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 98816

• Superfund sites nearbyA
• Factories and industrial sitesA to D
• Oil and gas wellsA
• Parks and nature nearbyA to C
• Air qualityB to C
• Drinking water qualityA to C
• Pesticide useF
• Neighborhood health statusC to F
• Past wildfire impactsF
• Past flood impactsA
• Noise levelsA
• Radiation signalsA to C

Based on 6 census tracts · compiled October 25, 2026 · how each grade works and its sources

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