Woodbury County, IA

ZIP 51105

In ZIP 51105, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Sioux City Water Supply has 2 contaminants at or over an EPA legal limit; 15 contaminants are above health goals, led by lithium at 19× the USGS health-based screening level.
• Nearest Superfund site: Mid-America Tanning Co., 7.1 miles away.
• Largest share of modeled toxic air from industry: Sioux City Foundry Co (47%), mostly chromium.
• Fine particles (PM2.5) average 7.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 353,519 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 51105

• Superfund sites nearbyA
• Factories and industrial sitesD to F
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityA to C
• Drinking water qualityC to F
• Pesticide useD to F
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsD to F
• Noise levelsA to D
• Radiation signalsF

Based on 8 census tracts · compiled October 25, 2026 · how each grade works and its sources

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