Agricultural operations have been a significant source of various contaminants such as pesticides, nutrients, pathogens, and the associated sediments that pose threats to both surface and ground water quality. Improved understanding of transport pathways of these pollutants throughout surface and subsurface environments and development of effective quantitative methodologies and management strategies are critical to the long-range sustainability of agriculture. This session will focus on all aspects related to these agriculture-originated pollutants, including their occurrence and distribution in surface water and ground water, modeling of their fate and transport in the vadose zone, aquifers, and surface water bodies, as well as the relevant water quality management. Integrated theoretical and application studies, and combined modeling and experimental studies are particularly encouraged.