Federal agencies operate within the limits of federal jurisdiction. For example, EPA's jurisdiction under the Clean Water Act is limited to "waters of the United States". In many cases federal laws allow for more stringent regulation by states, and of transfer of certain federally mandated responsibilities from federal to state control. US state governments, therefore, administering state law adopted under state police powers or federal law by delegation, uniformly include environmental agencies. The extent to which state environmental laws are based on or depart from federal law varies from jurisdiction to jurisdiction.