The City of Vacaville lies on top of the Solano Sub-Basin of the Sacramento Valley Groundwater Basin. In 2014, DWR identified the Solano Sub-Basin as a medium-priority basin, and maintained the priority level in the 2019 prioritization update.

The Vacaville GSA has partnered with other GSAs within the Solano Sub-Basin as part of a coordinating group known as the Solano Collaborative. This group is working together to create a single GSP for the sub-basin.

Other GSAs within the Solano Sub-Basin include:

• Solano Irrigation District GSA
• Solano Subbasin GSA
• Sacramento County GSA
• Northern Delta GSA

View the Solano Subbasin Interactive map. 

Educational information about groundwater and how it is used within the Solano Sub-Basin is available at the Groundwater Guide website.

Reference sites:

• SolanoGSP.com - Spanish: https://www.solanogsp.com/outreach/espanol/
• SolanoGSP.com - GSP Page: https://www.solanogsp.com/viewgsp/
• Groundwater Guide - English: https://groundwaterguide.com/
• Groundwater Guide - Spanish: https://groundwaterguide.com/inicio/

On April 11, 2017, City Council directed staff to form an exclusive GSA for the City of Vacaville.

A notice of the intent to form a GSA was published in accordance with California Government Code Section 6066, and a public hearing was held on April 25, 2017. Following the public hearing, City Council adopted Resolution No. 2017-046 to become a GSA.

The City filed an official notice with DWR on April 28, 2017.

In September 2014, Governor Brown signed the Sustainable Groundwater Management Act (SGMA). This act establishes a groundwater management structure within California and empowers local agencies to manage basins sustainably.

SGMA also:

• Establishes a definition of “sustainable groundwater management.”
• Requires that agencies in priority groundwater basins adopt Groundwater Sustainability Plans.
• Establishes a timetable for adoption of Groundwater Sustainability Plans.
• Establishes basic requirements for Groundwater Sustainability Plans.

For additional information on groundwater management in California, please see the following state websites:

• State Water Resources Control Board Groundwater Management Program
• Department of Water Resources Sustainable Groundwater Management
  • DWR's "Groundwater: Understanding and Managing this Vital Resource"