Custer County, ID

ZIP 83226

In ZIP 83226, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Salmon City Of has 1 contaminant at or over an EPA legal limit; 5 contaminants are above health goals, led by arsenic at 1,000× California’s Public Health Goal.
• Nearest Superfund site: Blackbird Mine, 2.2 miles away.
• Largest share of modeled toxic air from industry: Qb Corp (100%), mostly formaldehyde.
• Fine particles (PM2.5) average 5.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 25,166 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 83226

• Superfund sites nearbyA to C
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityD
• Pesticide useF
• Neighborhood health statusD
• Past wildfire impactsA to F
• Past flood impactsA
• Noise levelsA
• Radiation signalsF

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

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