Spokane County, WA

ZIP 99003

In ZIP 99003, 5 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, 1.4 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Spokane Industries (81%), mostly chromium.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 196,024 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 99003

• Superfund sites nearbyC to F
• Factories and industrial sitesA to C
• Oil and gas wellsA to B
• Parks and nature nearbyC
• Air qualityC
• Drinking water qualityC to F
• Pesticide useD to F
• Neighborhood health statusC to F
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsF

Based on 5 census tracts · compiled September 10, 2026 · how each grade works and its sources

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