If the United States Supreme Court grants certiorari in a case between Mississippi and Tenessee, the court will have its first opportunity to determine if and how transboundary aquifers should be regulated. The applications of this case are far from surface level. Regulated groundwater allocation would protect environmental and economic sustainability by restricting overpumping, thereby tempering the harmful effects of groundwater depletion, and protecting all parties to a transboundary aquifer from losing a freshwater source due to another's careless usage.