“Some cannabis growers may soon find themselves with a lot less irrigation water if the U.S. government decides to block the use of federal water for state-legal marijuana cultivation. The U.S. Bureau of Reclamation, which oversees management of federal water resources, ‘is evaluating how the Controlled Substances Act applies [to] water being used to facilitate marijuana-related activities,’ said the bureau. Local water districts in Washington state and Colorado, where recreational marijuana is now legal, contract with federal water projects for supplies. Officials from some of those water districts said they assume the feds are going to turn off the spigots for marijuana growers.”
http://www.huffingtonpost.com/2014/05/19/federal-water-marijuana_n_5335219.html