Spokane County, WA

ZIP 99023

In ZIP 99023, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Vera Water & Power meets every EPA legal limit; 6 contaminants are above health goals, led by arsenic at 574× California’s Public Health Goal.
• Nearest Superfund site: Mica Landfill, 1.2 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Spokane Industries (89%), mostly chromium.
• Fine particles (PM2.5) average 7.0 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 99023

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

Based on 3 census tracts · compiled October 25, 2026 · how each grade works and its sources

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