Humboldt County, IA

ZIP 50591

In ZIP 50591, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Lakewood Utilities meets every EPA legal limit; 6 contaminants are above health goals, led by lead at 143× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Valero Renewable Fuels LLC (55%), mostly acrolein.
• Fine particles (PM2.5) average 6.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 370,847 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 50591

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

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…