Stevens County, WA

ZIP 99110

In ZIP 99110, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Whitworth Water District 2 has 1 contaminant at or over an EPA legal limit; 6 contaminants are above health goals, led by pfos at 4.2× California’s Public Health Goal.
• Nearest Superfund site: Colbert Landfill, 7.8 miles away.
• Largest share of modeled toxic air from industry: Spokane Industries (71%), mostly chromium.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 40,370 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 99110

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

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

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