More than 30 interstate compacts govern the use of water from shared lakes and rivers in the United States. However, there is not a single legal agreement in place between states to guide the apportionment of groundwater that crosses state lines. In 2013, Nevada and Utah appeared poised to be the first two states to reach such an agreement, but ultimately they failed. Now, with a longstanding groundwater dispute between Mississippi and Tennessee headed for the U.S. Supreme Court, a legal precedent governing the apportionment of interstate groundwater is imminent. This webinar, presented by CSG South/Southern Legislative Conference and CSG West, explores the possible outcomes of Mississippi v. Tennessee, implications for interstate groundwater policy and the role of interstate compacts in resolving water disputes between states.