Floyd County, IA

ZIP 50458

In ZIP 50458, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Osage Municipal Water Supply has 1 contaminant at or over an EPA legal limit; 12 contaminants are above health goals, led by pfos at 4.2× California’s Public Health Goal.
• Nearest Superfund site: Mason City Coal Gasification Plant, 2.3 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Zinpro Corp (67%), mostly cobalt compounds.
• Fine particles (PM2.5) average 6.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 227,287 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 50458

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

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

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