Welcome to the Big Valley Groundwater Sustainability Plan Communication Portal

California's Sustainable Groundwater Management Act (SGMA) requires the preparation and implementation of Groundwater Sustainability Plans (GSPs) for High and Medium priority groundwater basins. The Big Valley Groundwater Basin (BVGB) is a medium priority basin and must be managed under a GSP by January 31, 2022. A map of the BVGB boundary can be seen by clicking here.

Lassen and Modoc Counties have stepped forward as Groundwater Sustainability Agencies (GSAs) for their respective portions of the basin and have agreed to work cooperatively to develop a single GSP for the BVGB. For more information, please visit the Groundwater Sustainability Agency websites at:

The purpose of this website is to facilitate active participation of stakeholders in the GSP development and implementation for the Basin. The website will be used in the following ways:

  • Users may register as an Interested Party to be notified when new events are scheduled or documents related to the GSP are available to the public
  • View the calendar to see planned events
  • Register for an event
  • View Draft Plan documents and provide comments

Household Water Supply Shortage Reporting Resources

For a information about household water supply shortage resources click here.

COVID-19 Response by the Big Valley Groundwater Basin Advisory Committee (BVAC)

In consultation with the Chair, Vice Chair, and Counsel, and consistent with California Governor Gavin Newsom's executive Order N-29-20 issued on March 17, 2020, relating to the convening of public meetings, BVAC meetings will be open to the public online or by telephone only until further notice. For more information about upcoming meetings and how to participate, see the "Events" section below.

Register as an interested party

Register as an interested party to receive email notifications from the Communication Portal.

Public Comments

On December 15, 2021, the Groundwater Sustainability Agencies (GSAs) will hold concurrent public hearings to consider adoption of the Big Valley Groundwater Sustainability Plan (GSP).

All interested persons and agencies are invited to attend the meeting and be heard, or to submit comments prior to the meeting to the Lassen Board, c/o Department of Planning and Building Services, 707 Nevada Street, Suite 5, Susanville, California 96130, or to the Modoc Board c/o Office of Administration, 204 South Court Street, Alturas, CA 96101

You can download the Final Draft GSP by clicking on the links below: