Woodbury County, IA

ZIP 51106

In ZIP 51106, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: South Sioux City, City Of meets every EPA legal limit; 11 contaminants are above health goals, led by lead at 42× California’s Public Health Goal.
• 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 51106

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

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

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