The Sonoma Valley Groundwater Sustainability Agency (GSA) is a public agency formed to sustainably manage groundwater in the Sonoma Valley groundwater basin. The agency was formed in June 2017 and has a Board of Directors, an administrator and an advisory committee.

Agendas & Meeting Calendar

Find out when and where the Board of Directors and the Advisory Committee are meeting next

Groundwater Sustainability Plan

Draft Section 3 of the GSP is no longer open for comment.

Take a look at our 20-year plan for groundwater sustainability

Find Your Basin

To determine your basin of residence, click here and type your address into the search bar at the top left of the page

Materiales en Español

Estamos trabajando para proporcionar tantos materiales en español como sea posible

Drought and Groundwater

Worried about your well during the current drought? Rainfall in the region to date is only 12.89 inches, compared to average rainfall of 34 inches. The unprecedented dry conditions affects groundwater resources in multiple ways:

  • There is less recharge into the aquifer from rain, creeks, streams and other surface water;
  • People use more water to irrigate drought-stressed landscapes, gardens, vines and crops; and
  • Water catchment systems and on-farm reservoirs received minimal run-off, and may already be dry, resulting in greater reliance of groundwater for irrigation and drinking water for animals.

For all these reasons and more, rural landowners who rely on groundwater are understandably concerned about the impact that drought could have on wells.

For more information and resources about the drought, groundwater wells and groundwater monitoring and reporting visit our drought page.

Defining Sustainability for the Sonoma Valley Groundwater Basin

Join the June 23, 2021 virtual community meeting

Wednesday, June 23

5:30-7:30 p.m.

Please register in advance for the link to this webinar:

After registering, you will receive a confirmation email containing information about joining the webinar.

Meeting topics include:

· Overview of the basin and concerns

· The groundwater budget: How much water is coming into the basin and how much water is going out — now and into the future

· Defining sustainability locally

· Measuring sustainability

Defining Sustainability in the Sonoma Valley

The GSA Board and Advisory Committee are working hard to develop locally appropriate definitions of sustainable groundwater management for the six sustainability indicators, below, as required by SGMA.

Go the Groundwater Sustainability Plan pages for updates.

What is the Sustainable Groundwater Management Act?
The Sustainable Groundwater Management Act (SGMA) requires that California groundwater basins identified as high or medium priority establish a Groundwater Sustainability Agency by June 30, 2017, and develop a plan for sustainable management by January 31, 2022. If the local GSAs fail to follow the timeline, then the State Water Resources Control Board will step in and intervene in local groundwater management. SGMA defines sustainable management as:

“Management and use of groundwater in a manner that can be maintained during the planning and implementation horizon without causing undesirable results.”

The Sonoma Valley GSA will be tracking six main sustainability indicators:

Lowering Groundwater Levels

Seawater Intrusion

Reduction of Storage

Land Subsidence

Degraded Groundwater Quality

Surface Water Depletion

For more information about groundwater, visit our Understanding Groundwater page or read our Groundwater Primer.
Groundwater Sustainability Plan Development Timeline