Whitman County, WA

ZIP 99033

In ZIP 99033, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Sleepy Hollow Apts has 2 contaminants at or over an EPA legal limit; 5 contaminants are above health goals, led by pfos at 6.4× California’s Public Health Goal.
• Closer to Superfund sites than 89% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Spokane Industries (43%), mostly chromium.
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 626,961 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 99033

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

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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