Cerro Gordo County, IA

ZIP 50401

In ZIP 50401, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Ventura Water Works has 1 contaminant at or over an EPA legal limit; 7 contaminants are above health goals, led by arsenic at 3,152× California’s Public Health Goal.
• Nearest Superfund site: Mason City Coal Gasification Plant, 0.9 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Zinpro Corp (66%), mostly cobalt compounds.
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 267,117 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 50401

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

Based on 11 census tracts · compiled October 25, 2026 · how each grade works and its sources

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