The U.S. Supreme Court in Tarrant Regional Water District v. Herrmann et. al. held that states have a right to restrict out-of-state diversions of water. 569 U.S. ___ (June 13, 2013). The unanimous decision delivered by Justice Sotomayor held “[t]he Red River Compact does not preempt Oklahoma’s water statutes because the Compact creates no cross-border rights in its signatories for these statutes to infringe. Nor do Oklahoma’s laws run afoul of the Commerce Clause.” The Red River Compact, 94 Stat. 3305, allocates water rights between the States within the Red River Basin. These States include Texas, Oklahoma, Arkansas, and Louisiana. Tarrant Regional Water District, a Texas Agency, brought this suit in an effort to acquire water under the Red River Compact from within Oklahoma. The Red River Compact is silent as to cross-border rights. Tarrant Regional Water District alternatively argued that the Oklahoma statutes unconstitutionally restrict interstate commerce because; Oklahoma water statutes limit out-of-state water diversions. Both arguments were denied by the U.S. Supreme Court.