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.

Meeting Calendar

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

Email Updates

Sign up to receive monthly email updates on groundwater management activities

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

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Sonoma Valley groundwater basin land use and crop type map (click to view larger)

Recent News

Basin Reprioritization Comments

On August 20, the California Department of Water Resources closed the public comment period for its draft basin reprioritization. Under the draft assessment, Sonoma Valley Basin increased from medium to high priority. In addition, three Sonoma County basins were increased to medium priority: Alexander Valley, Wilson Grove and Dry Creek. The Sonoma Valley GSA submitted comments expressing concerns regarding reprioritization (above)

Learn More

Monthly Email Updates

Find out what’s happening with groundwater activities in Sonoma County by reading the latest email update. Visit the “Email Updates” page to read updates from past months.

Latest Update
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