Walla Walla County, WA

ZIP 99362

In ZIP 99362, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Veterans Affair Med Ctr Dept Of has 1 contaminant at or over an EPA legal limit; 10 contaminants are above health goals, led by arsenic at 500× California’s Public Health Goal.
• Closer to Superfund sites than 59% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Boise White Paper LLC (73%), mostly formaldehyde.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 2,161,365 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 99362

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

Based on 15 census tracts · compiled October 25, 2026 · how each grade works and its sources

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