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“The San Joaquin Valley—California’s largest agricultural region—has the largest groundwater deficit in the state. However, water scarcity is not experienced equally across the valley.
Some areas receive abundant surface water to support cropland irrigation and drinking water supplies. Most others supplement their use with groundwater. Still others have no surface water access and depend entirely on groundwater.
Water users in these groundwater-only areas are particularly vulnerable to pumping restrictions under the Sustainable Groundwater Management Act (SGMA)—the state-mandated effort to balance groundwater basins. … ”
Read more from the PPIC blog here: Got Surface Water? Groundwater-only Lands in the San Joaquin Valley