Sioux County, IA

ZIP 51036

In ZIP 51036, 5 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.
• 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 (54%), mostly acrolein.
• Fine particles (PM2.5) average 6.7 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 51036

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

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…