SGMA in the Cosumnes Subbasin

New to SGMA?

Spend a few minutes with these resources

(more resources available below)


Governance Announcement – On October 20, 2021, the Cosumnes Subbasin Working Group approved sharing two governance documents with their respective GSA Boards to consider formally approving:

  1. Joint Powers Authority (JPA) agreement to form the Cosumnes Groundwater Authority for GSP implementation
  2. Initial Funding and Revenue Agreement

Visit GSA websites for schedule of GSA Board meetings – (links to websites are on the 2nd page)

The Draft Groundwater Sustainability Plan (GSP) is available to view/download. The public review and comment period occurred August 18 – October 20, 2021.

Quicklinks to Quick Reads for the Draft GSP

The Full Read 

Click HERE or the green button to view and download the full technical documents for the Cosumnes Public Draft GSP. Files are large, so download each file separately.

Upcoming SGMA Meetings

Refer to the Meetings page for upcoming and previous meetings and public workshops

Questions about an upcoming event?

Contact Stephen Julian at or 254.640.0155

Si necesita solicitar alojamiento para asistir a un próximo evento, incluidos los servicios de traducción, comuníquese con Stephen Julian a o al 254.640.0155


New to SGMA? Check out these helpful resources:

SGMA in the Cosumnes Subbasin

Under California law, the Sustainable Groundwater Management Act (SGMA) requires the Cosumnes Subbasin to form a groundwater sustainability agency or agencies (GSAs) by June 30, 2017, and to have a groundwater sustainability plan (GSP) in place by 2022.

The following seven agencies filed with the state to form a GSA within the Cosumnes Subbasin:

  • Omochumne-Hartnell Water District (website)
  • Sloughhouse Resource Conservation District (website)
  • Galt Irrigation District (website)
  • Clay Water District (website)
  • City of Galt (website)
  • Amador County Groundwater Management Authority (website)
  • Sacramento County (website)

These GSAs are now engaged in a collaborative group, called the Cosumnes Subbasin SGMA Working Group, to discuss developing a roadmap for creating a groundwater sustainability plan. 

Learn how you can contact your local GSA Representative

Note: Elk Grove is in the South American Subbasin — not the Cosumnes Subbasin — and Sacramento Central Groundwater Authority (SCGA) is your local groundwater sustainability agency. For more information about SGMA in the South American Subbasin, visit the SCGA website at

Stakeholder Outreach + Engagement

The Working Group developed a plan to work closely with affected stakeholders including agriculture, environmental interests, rural residential well owners, tribal interests, and others. The GSAs recognize the importance of engaging stakeholders and the broader public in discussions related to groundwater sustainability plan development and implementation and commit to leading a transparent and inclusive process to foster the consideration of the beneficial uses and users of groundwater in the basin. View the Outreach and Public Engagement Plan (2019 Version) (Summer 2021 Draft Update)

Cosumnes Subbasin Resources

Click on the images below to view/download materials

Additional Resources