Grant County, WA

ZIP 99349

In ZIP 99349, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mattawa City of meets every EPA legal limit; 8 contaminants are above health goals, led by arsenic at 271× California’s Public Health Goal.
• Closer to Superfund sites than 58% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Yakima Training Center- Range (84%), mostly lead compounds.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 5,279,716 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 99349

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

Based on 2 census tracts · compiled October 25, 2026 · how each grade works and its sources

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