I think the first step is to develop a "we're not Texas" culture. Observe the ways in which Texas is ruining its environment and deliberately, conspicuously do something else.

For example, the aquifer situation in the Central Valley of California is in some ways similar to Ogallala aquifer in Texas. "If we don't want to end up like Texas, we need to get a handle on this." Enact laws and conservation measures which make it difficult for those coming from out of state to bring their ecologically irresponsible practices with them. Ideally, reduce the ecological impact wrought by well-established California interests as well, but if necessary grandfather them in in order to prepare.