Custer County, SD

ZIP 57744

In ZIP 57744, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Southern Black Hills Water meets every EPA legal limit; 3 contaminants are above health goals, led by arsenic at 1,750× California’s Public Health Goal.
• Nearest Superfund site: Ellsworth Air Force Base, 7.8 miles away.
• Largest share of modeled toxic air from industry: Gcc Dacotah (75%), mostly chromium compounds.
• Fine particles (PM2.5) average 5.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 53,814 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 57744

• Superfund sites nearbyA to F
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityA
• Drinking water qualityC to D
• Pesticide useD to F
• Neighborhood health statusC to F
• Past wildfire impactsA to F
• Past flood impactsA
• Noise levelsA to C
• Radiation signalsD to F

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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