Behind many of the shiny fruits and vegetables in the produce aisle, theres a decidedly ominous backstory: California, supplier of much of our domestic produce, is just one earthquake away from drying up. The problem is that most of the states agricultural water, as well as drinking water for large parts of Silicon Valley, Los Angeles, San Diego, and other major metropolitan areas, comes from a vast estuary northeast of the San Francisco Bay. The Sacramento-San Joaquin River Delta, or more simply, the Delta, relies on old levees that will crumble in an earthquake or buckle under pressure from rising sea levels, say experts, and in fact already do crumble on a regular basis. A large-scale collapse would put the states water supplies in grave jeopardy, and in turn impact the entire country, which relies on California both economically and for a large amount of its food.