Having lived in Southern and Northern California, the State has not grappled with the issue in view of my opinion of the environmental groups opposing other solutions not just curtailing the use of water, water restrictions, increasing of water prices,recycling, etc., also the political and monetary muscle to get things done. The governor Brown inability to push a comprehensive water policy and technologies to get us back into a non-drought state by using other technologies.
The State and the communities at large could solve the problem just as other nations (i.e Israel, etc.) have in essence made the dessert bloom. We have to look at several alternatives, not just one option, such as water desalinization plants (environmentalist oppose this), build more sustainable water dams, dripping irrigation, recycling, etc.
The other main issues is the huge Central Valley area of California with millions of farmers taking large amount of water from the Colorado river to irrigate their crops, as well as depleting water table acquifers from their lands, since not only California exports large amount of its fruits and vegetables to other states, but other nations.
To really tackle the problem we need the governor and legislature of California to stop with small minded solutions and tackle the issue head on with construction of projects, tax incentives to corporations/engineering firms that are able to give us other solutions to this issue.