Sioux County, IA

ZIP 51250

In ZIP 51250, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Rock Valley Water Supply meets every EPA legal limit; 15 contaminants are above health goals, led by lead at 35× California’s Public Health Goal.
• Closer to Superfund sites than 55% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Siouxland Energy Cooperative (51%), mostly acrolein.
• Fine particles (PM2.5) average 6.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 420,419 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 51250

• Superfund sites nearbyA to C
• Factories and industrial sitesB to C
• Oil and gas wellsA
• Parks and nature nearbyD
• Air qualityA to B
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsC to F
• Noise levelsA to D
• Radiation signalsD to F

Based on 5 census tracts · compiled September 10, 2026 · how each grade works and its sources

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