Sioux County, IA

ZIP 51239

In ZIP 51239, 4 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; 9 contaminants are above health goals, led by lithium at 7.1× the USGS health-based screening level.
• 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: Little Sioux Corn Processors LLC (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 51239

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

Based on 5 census tracts · compiled October 25, 2026 · how each grade works and its sources

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