Polk County, IA

ZIP 50321

In ZIP 50321, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Wilshire Hills Mhc meets every EPA legal limit; 7 contaminants are above health goals, led by lead at 53× California’s Public Health Goal.
• Nearest Superfund site: Railroad Avenue Groundwater Contamination, 2.0 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Quality Manufacturing Corp - Urbandale (61%), mostly chromium.
• Fine particles (PM2.5) average 7.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 180,173 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 50321

• Superfund sites nearbyD to F
• Factories and industrial sitesA to D
• Oil and gas wellsA
• Parks and nature nearbyC to F
• Air qualityB to C
• Drinking water qualityD to F
• Pesticide useD to F
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsD to F
• Noise levelsA to F
• Radiation signalsD

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

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