2003: Bulletin 118 basin description

2014: Basin priority: medium

2015: Declining groundwater levels noted in State of the Salinas River Groundwater Basin, Monterey County Resource Management Agency

2016: Basin boundary modifications approved  with the Santa Cruz Purisima 3-021, Pajaro Valley 3-002, Langley Area 3-004.09, and 180/400 Foot Aquifer subbasins.

Bulletin 118 Interim Update: Various portions of the original Pajaro Valley Basin were moved to three adjacent subbasins/basins— 180/400 Foot Aquifer Subbasin (3-004.01), Langley Area Subbasin (3-004.09), and the newly formed Santa Cruz Mid-County (3-001) Basin. A portion of the for- mer Santa Cruz Purisima Formation Basin (3-21) was added to this basin. The Pajaro Valley Basin was also reclassified as a subbasin.

Revised boundary description notes 

2018: Basin prioritization comment: Seawater intrusion began in the Salinas Valley by the 1930s. Since that time, seawater intrusion has continued and now extends more than five miles inland. The Monterey County Flood Control and Water Conservation District built Nacimiento Dam in 1957 and an Antonio Dam in 1965 to provide flood control and to accelerate groundwater recharge to mitigate seawater intrusion. In April 1998, the Monterey County Water Recycling Projects started delivering recycled water for irrigation in lieu of groundwater pumping, effectively slowing the seawater intrusion rate (MCWRA, 2006).  The Salinas Valley Water Project is currently being implemented by the Monterey County Water Resources Agency to mitigate groundwater overdraft and seawater intrusion. The project includes mitigation measures such as construction or retrofit of recharge dams, protection of recharge areas, and injection of recycled water into the impacted aquifers.

2018 Final Basin Prioritization:  Basin status is changed from medium to high priority.