Established in 1998, the Hydrogeology Department (HD) within LBNL’s Earth Sciences Division (ESD) currently consists of more than 50 scientists, postdocs, research associates, and graduate students, carrying out a broad range of cutting-edge research in fundamental and applied hydrology. The Hydrogeology Department has expertise in theoretical, experimental, field, and modeling approaches in a variety of research areas, among which are advanced process modeling, reservoir engineering, fracture hydrology, contaminant hydrology, and coupled nonsothermal, geochemical, and geomechanical processes. The Hydrogeology Department addresses national needs in the areas of subsurface energy resources recovery, subsurface remediation, geological CO2 storage, and nuclear waste disposal.