Current models of groundwater governance focus principally on the allocation of water, rather than taking a holistic approach incorporating valuable storage space in the aquifer, as well as the transformative changes in managed recharge of manufactured water, storm water, and carbon. Effective implementation of a more modern approach now calls for rethink of both scale and jurisdictional boundaries. This involves linking public and private aspects of water quantity, water quality, geothermal regulation, property rights, subsurface storage rights, water marketing, water banking, legal jurisdictions, and other components into a single governance document. This style of agreement stands in contrast to the siloed approach currently applied to aquifer resources. Using case studies, and an activity inspired by gaming concepts to explore the incentives, and challenges to aquifer governance approaches, this book demonstrates how application of the principles of unitization agreements to aquifers could provide a new approach to aquifer governance models.