Harding County, SD

ZIP 57776

In ZIP 57776, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Buffalo meets every EPA legal limit; 4 contaminants are above health goals, led by arsenic at 500× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Fine particles (PM2.5) average 5.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 31,983 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 57776

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsC
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityD
• Pesticide useF
• Neighborhood health statusC
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsD

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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