Since its inception in 1960, the Division of Hydrologic Sciences (DHS) has built a strong program of research in the field of hydrogeology. As one of the driest states in the nation, it is natural that DHS is the home to more hydrogeologists of any institution in Nevada and possibly the nation. Faculty members within the Hydrogeology Group have a broad range of expertise to support multidisciplinary research related to regional groundwater flow. Their talent goes beyond the traditional areas of emphasis including groundwater resource evaluation, contaminant and reactive transport, and geochemical evolution of groundwater. Although DHS researchers spend a large portion of their research effort on groundwater issues within the State of Nevada, their current research portfolio extends well beyond the borders of Nevada and the nation. Many research faculty hold joint appointments in water resource-related academic departments at the University of Nevada, Reno, and the University of Nevada, Las Vegas, where they teach, advise students and direct graduate student theses.