Columbia County, WA

ZIP 99328

In ZIP 99328, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Starbuck City Of meets every EPA legal limit; 2 contaminants are above health goals, led by lead at 45× 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: Walla Walla Foundry Inc. (87%), mostly copper.
• Fine particles (PM2.5) average 6.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 92,868 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 99328

• Superfund sites nearbyA
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusF
• Past wildfire impactsC
• Past flood impactsA
• Noise levelsC
• Radiation signalsD

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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