In the last decade, California—along with the rest of the world—has entered a new phase of climate change. The changes that scientists predicted have started to arrive. California’s already variable climate is growing increasingly volatile and unpredictable: The dry periods are hotter and drier, and the wet periods—lately too few and far between—are warmer and often more intense. … The snowpack—that once-reliable annual source of water—is diminishing as temperatures rise. Water withdrawals during multiyear droughts are depleting the state’s reservoirs and groundwater basins. … This report considers the state of water in California: What changes are we seeing now, and what should we expect in the near future?