Centro de Investigacion Cientifica de Yucatan, Unidad de Ciencias del Agua, Cancun, Quintana Roo, Mexico;
Northern Illinois University, Department of Geology and Environmental Geosciences, DeKalb, USA;
University of Arizona Water Resources Re- search Center, Tucson, USA;
Groundwater; Microbial; Chemical; Contaminants; Transport; Yucatan; Peninsula; Quintana; Roo;