Pennington County, SD

ZIP 57725

In ZIP 57725, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Owanka Rural Water System meets every EPA legal limit; 3 contaminants are above health goals, led by lead at 17× California’s Public Health Goal.
• Closer to Superfund sites than 86% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Gcc Dacotah (66%), mostly chromium compounds.
• Fine particles (PM2.5) average 5.6 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 57725

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

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

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