Owyhee County, ID

ZIP 83628

In ZIP 83628, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Murphy Water System meets every EPA legal limit; 6 contaminants are above health goals, led by arsenic at 1,300× California’s Public Health Goal.
• Closer to Superfund sites than 54% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: US Ecology Idaho Inc. (98%), mostly asbestos (friable).
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 246,128 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 83628

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

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

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