Valle de Guadalupe is a semi-arid wine-making subregion in Baja California, which is a desert where the land is freckled with agave, cactus and chaparral alongside grapevines and olive trees. It lies a two-hour drive south of San Diego. … Water woes are another looming factor. Rain has always been scarce here, and signs are growing that the valley’s demand for water is overwhelming its infrastructure. Unlike many wine regions in California that are able to rely on varying sources of water, Valle de Guadalupe has the Guadalupe Aquifer, a body of porous ground or sediment that holds groundwater, as its only source of water. Depending on the rainfall each year, the water table rises and falls. But since 1995, the general trend has been more water being sucked out of the aquifer than going in …