Sustainable Groundwater Management

Napa County Groundwater Sustainability Agency

The Napa County Groundwater Sustainability Agency (GSA) meets once a month per their adopted calendar. Videos, agendas, and meeting materials can be found on the GSA's agendas and minutes webpage.

On June 9, 2020, the GSA appointed 25 members to its Groundwater Sustainability Plan Advisory Committee (GSPAC). The GSPAC was created to advise the GSA Board of Directors on the preparation of a Groundwater Sustainability Plan (GSP), with policies and recommendations to manage the groundwater within the Napa Valley Groundwater Subbasin to ensure its long-term protection and availability. The GSPAC was directed to submit a recommended GSP to the GSA Board of Directors for their consideration no later than November 1, 2021. The GSPAC meets on the 2nd Thursday of each month at 1:30 pm. GSPAC agendas, minutes, and meeting materials are available on their agendas and minutes webpageYour input is very important and will help improve the various ways groundwater information and education programs are offered to our community and will shape future groundwater policy.

The GSP will contain 12 sections in total. Draft sections will be released on a monthly to quarterly basis through September 2021. Each section will be revised iteratively based upon public input and technical data. Below are the most current sections available, along with a corresponding online survey to gather public input. 

Draft GSP Section

 Online Survery

Section 1, Updated 9/2/2020 (12MB)

 Comment Survey for Sections 1 & 2

Section 2, Updated 9/2/2020 (10 MB)


Section 3, 9/1/2020 (26 MB)

 Comment Survey for Section 3

Section 4, 10/1/2020 (67 MB)


Section 5, 9/30/2020 (16 MB)

 Comment Survey for Sections 4 & 5


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The 2014 Sustainable Groundwater Management Act (SGMA) provides a framework for sustainable management of groundwater resources by local authorities. The act establishes a timeline - 20 years - to implement actions that achieve long-term groundwater sustainability. It protects existing surface water and groundwater rights and does not impact drought response measures. The Department of Water Resources (DWR) is in charge of the SGMA Program and has developed guidelines for local agencies to follow. 

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Groundwater Sustainability Agency (GSA) was formed for the Napa Valley Subbasin in order to be in compliance with SGMA and DWR regulations, otherwise the Subbasin would be deemed "unmanaged." If a GSA was not formed, the State Water Resources Control Board (SWRCB) would be obligated to step in to monitor and manage groundwater users. The SWRCB could require all groundwater users within the Subbasin to install meters, report extractions, and pay fees to cover State costs.

On December 17, 2019, the Napa County Board of Supervisors conducted a public hearing under Water Code section 10723 and adopted a resolution affirming Napa County's intention to manage groundwater in the Napa Valley Subbasin and to form the Napa County Groundwater Sustainability Agency (GSA) pursuant to Water Code section 10724, and authorized the submittal of GSA Formation Information to DWR. Water Code section 10724 provides that the County is presumed to be the GSA for the areas in the Subbasin that are "unmanaged" (not within the management of GSA). DWR's SGMA website portal provides local agencies, GSA's, and watermasters the ability to submit, modify, and view the information required by SGMA, and enables the public and interested stakeholders to view submitted information and provide comments, where applicable. No login is required for public access.

On January 7, 2020, the Napa County GSA held its first meeting. The agenda for this first meeting was to elect officers, appoint an executive officer, adopt a 2020 meeting calendar, and approve a resolution authorizing the submittal of a $2.6 million dollar grant application to DWR to support the development of a Groundwater Sustainability Plan (GSP) for the Napa Valley Subbasin. The new GSA is required to develop a GSP for the Napa Valley Subbasin and submit it to DWR by January 2022.

On February 6, 2020, the Napa County GSA submitted notification to the Department of Water Resources of their intent to prepare a Groundwater Sustainability Plan for the Napa Valley Subbasin.

The Napa County GSA meets monthly. Additional details on the upcoming GSA meeting can be found on the GSA's agendas and minutes webpage.

 Sign up to be on the Napa County GSA email list to learn about opportunities where you can participate. Please encourage others who are interested in groundwater to also join the GSA email list by providing them with this sign-up link:

Jeff Sharp, Principal Planner, (707) 259-5936,