Recently, Federal and State agencies have instituted water management and programs to prevent and/or clean up water pollution for purposes of maintaining the availability of adequate water supplies. Significant problems in water supply, however, result in transferring quantities of water between states. In view of the present national water crisis, Federal government regulation of interstate water transfer is often advocated. But in the absence of Federal action, the states must protect and manage their own groundwater resources. States can protect their percolating water resources only by valid conservation laws, not by antiexport statutes which discriminate against out-of-state users.