The California Department of Water Resources (DWR), on July 27, 2023, announced the approval of the North American Subbasin (NASb) Groundwater Sustainability Plan (GSP)August 3, 2023September 29, 2023 The California Department of Water Resources (DWR), on July 27, 2023, announced the approval of the North American Subbasin (NASb) Groundwater Sustainability Plan (GSP)