Although we have made impressive investments to develop local water supplies, most of San Diego’s water continues to come from far away. In fact, more than 80 percent of our county’s water supply is imported from Northern California and the Colorado River. And this heavy reliance on imported water is expected to continue for decades to come, even with much needed local investments in conservation, desalination and recycling. Soon, Southern California will be asked to make an important decision related to its north state supply.