Clay County, IA

ZIP 51301

In ZIP 51301, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Ruthven Water Supply meets every EPA legal limit; 8 contaminants are above health goals, led by arsenic at 1,125× 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 Hartley Plant (43%), mostly acrolein.
• Fine particles (PM2.5) average 6.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 272,811 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 51301

• Superfund sites nearbyA
• Factories and industrial sitesA to C
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityA
• Drinking water qualityB to C
• Pesticide useF
• Neighborhood health statusC to D
• Past wildfire impactsA
• Past flood impactsF
• Noise levelsA to D
• Radiation signalsF

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

Loading the full report, with every source…