Chickasaw County, IA

ZIP 50603

In ZIP 50603, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Ionia Water Supply meets every EPA legal limit; 5 contaminants are above health goals, led by arsenic at 1,395× California’s Public Health Goal.
• 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: Zinpro Corp (63%), 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 224,603 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 50603

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

Based on 2 census tracts · compiled October 25, 2026 · how each grade works and its sources

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