Sioux County, IA

ZIP 51041

In ZIP 51041, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Sioux Center Municipal Water Department meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 29× California’s Public Health Goal.
• Nearest Superfund site: Farmers' Mutual Cooperative, 8.8 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Little Sioux Corn Processors LLC (34%), mostly acrolein.
• Fine particles (PM2.5) average 6.8 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 51041

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

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

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