A published study in Environmental Science: Processes & Impacts presents the first comprehensive statewide assessment of contaminants of global concern (CGCs) in Iowa’s wadable agricultural streams. Conducted by researchers from the University of Iowa, U.S. Geological Survey, and other institutions, the study highlights the environmental footprint of intensive agriculture across water, sediment, and fish samples.

Key findings include:

• Microplastics were detected in every sample of water, sediment, and fish.
• PFAS, including PFOS, were found in all fish samples and most water and sediment samples.
• Antibiotic resistance genes (ARGs) were present in over half of the water and sediment samples.
• Pharmaceuticals and personal care products (PPCPs), especially metformin, were frequently detected.
• While chemical exposure risks were generally below moderate thresholds, all fish samples exceeded microplastic risk thresholds for food dilution and tissue translocation.

The study provides critical baseline data for understanding the environmental impacts of agricultural practices in Iowa and underscores the need for integrated monitoring and mitigation strategies.

The full article is available open access at the Royal Society of Chemistry.