he is a professor at uc hastings, and he says part of the reason the numbers are different state wide is because there is no statewide mandate for people to conserve water. >> there is no law that says, if in a drought, under these conditions, you should conserve this much. reporter: he says a mandate is possible, and can force people to save water. >> doing things on a statewide basis, perhaps in collaboration with the lower government but having a statewide push, could reduce some of the unfairness. reporter: however, he says doing so would require state politicians to work on it. if they do so, it will force water conservation across the state. kristen: could wastewater be the solution to drought problems in the south? california is expanding a new water plant. dustin dorsey explains how they are using technology to lead the county out of the drought. reporter: for those wondering just how bad the drought is in santa clara county, let the images of our local reservoirs and do the talking. calero, anderson, community conservation is important. but if something doesn't change, condit