Clay County, SD

ZIP 57073

In ZIP 57073, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Clay Rural Water System meets every EPA legal limit; 3 contaminants are above health goals, led by lithium at 5.2× the USGS health-based screening level.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Poet Biorefining - Chancellor (71%), mostly acrolein.
• Fine particles (PM2.5) average 6.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 225,921 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 57073

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

Based on 2 census tracts · compiled October 25, 2026 · how each grade works and its sources

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