Spokane County, WA

ZIP 99030

In ZIP 99030, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Spo Co Water Dist 3 Sys 1 meets every EPA legal limit; 13 contaminants are above health goals, led by pfos at 2.5× 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 (80%), mostly chromium.
• Fine particles (PM2.5) average 6.8 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 99030

• Superfund sites nearbyD to F
• Factories and industrial sitesB
• Oil and gas wellsB to C
• Parks and nature nearbyC to D
• Air qualityB
• Drinking water qualityC to F
• Pesticide useF
• Neighborhood health statusC to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsD to F

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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