Cass County, IA

ZIP 50843

In ZIP 50843, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Massena Water Supply has 1 contaminant at or over an EPA legal limit; 9 contaminants are above health goals, led by lead at 14× 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: Poet Biorefining - Menlo LLC (47%), mostly acrolein.
• Fine particles (PM2.5) average 6.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 223,809 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 50843

• Superfund sites nearbyA to C
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyD
• Air qualityA
• Drinking water qualityD
• Pesticide useF
• Neighborhood health statusD
• Past wildfire impactsA
• Past flood impactsB to C
• Noise levelsA
• Radiation signalsD to F

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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