DoD is responsible for remediating and protecting the groundwater associated with military installations. Contaminated groundwater is the largest liability in the Defense Environmental Restoration Program. Thousands of sites have been impacted by chlorinated solvents, PFAS, 1,4-dioxane, energetic materials, perchlorate, and other hazardous compounds. All such sites require characterization, remediation and monitoring. This session addressed the advances in characterization, monitoring, treatment and management of groundwater sites.