Sioux County, IA

ZIP 51238

In ZIP 51238, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Orange City Municipal Water Department meets every EPA legal limit; 11 contaminants are above health goals, led by lithium at 3.5× the USGS health-based screening level.
• Nearest Superfund site: Farmers' Mutual Cooperative, 4.6 miles away.
• Largest share of modeled toxic air from industry: Little Sioux Corn Processors LLC (51%), 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 51238

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

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

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