Share Your Input

Public comment is welcome throughout the Periodic Evaluation process. If you have questions or feedback about the Vina Subbasin's GSP Periodic Evaluation, use the comment form to submit your input. 
October 26, 2026: General public review and comment period closes so that input received can be packaged for SHAC and Board consideration.

 GSP Periodic Evaluation & Plan Amendments

Vina Draft Periodic Evaluation_20260915.pdfVina_Draft Amended GSP_20260915_ clean.pdfVina_Draft Amended GSP_20260915_redline

Anticipated Timeline for Document Approval and Submission

• September 15, 2026: Draft documents released for public review
• September 16, 2026: Public workshop, Chico Masonic Family Center, 5:30–7:00 PM – walk through of the draft documents and process for public input and address questions
• October 14, 2026: Comments on the draft Local Management Level language are requested by this date so that staff can include them in the materials for the October 28, 2026 SHAC meeting.
• October 26, 2026: General public review and comment period closes
• October 28, 2026: SHAC meeting – consideration and possible recommendation regarding description of Local Management Levels in the draft PE and plan amendments
• November 4, 2026: Joint Board meeting – direction on the description of Local Management Levels in the draft PE and plan amendments.
• November 18, 2026: Final review and recommendation by the SHAC on the Periodic Evaluation and Plan Amendments
• December 9, 2026: Joint GSA Boards’ final approval of the Periodic Evaluation and adoption of Plan Amendments
• January 28, 2027: Final Periodic Evaluation and Plan Amendment documents submitted to DWR through the SGM Portal
• After submittal: DWR reviews the submitted documents as part of its periodic review of the GSP. In the meantime, the GSAs continue to implement the GSP and to submit annual reports to DWR each April 1. 

Under the Sustainable Groundwater Management Act (SGMA), Groundwater Sustainability Agencies must evaluate their Groundwater Sustainability Plans (GSPs) every five years to assess progress toward achieving groundwater sustainability. The Vina Subbasin’s first GSP Periodic Evaluation will be submitted to the California Department of Water Resources (DWR) in January 2027.

This webpage provides information related to the Periodic Evaluation, including new data, studies, and projects completed since the adoption of the GSP (see Table 1 and links below). These updates help the GSA assess whether the current plan remains effective or whether adjustments to the basin description, sustainability criteria, or management approach may be needed.  This [Annotated Outline] document is based on DWR guidance and shows the required sections of the Periodic Evaluation with notes specific to the Vina Subbasin included.

The focus of this first Periodic Evaluation is to address the Department of Water Resources’ 6 Recommended Corrective Actions (from the 2023 Determination Letter) and provide a written assessment of GSP implementation. Once submitted, DWR will complete its Periodic Review of the Vina GSP and issue a determination of the status of the Plan: Approved, Incomplete, or Inadequate.

 For those interested in more detail, additional supporting materials are available:

Periodic Evaluation Supporting Documents

Strawman Proposals – for consideration and discussion

The following strawman proposals (i.e. a preliminary, rough draft intended to spark discussion and gather feedback) are provided to facilitate discussion and solicit public input on specific topics identified in the RCAs and Determination Letter.  Any input received will be incorporated into and inform materials prepared for consideration by the Stakeholder Advisory Committee (SHAC) and then brought forward to the GSA Boards for decision making.

GWL Strawman Final_rev 7.9.2026.pdfGWL Strawman Final_6.18.2026.pdfISW Memo and Strawman_Final 5.18.2026.pdfLand Subsidence_Memo and Strawman Proposal_4.24.2026.pdf