SGMA in the Cosumnes Subbasin

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

New to SGMA?

Spend a few minutes with these resources

Visit the Resources page for more information


Cosumnes Groundwater Authority Formation

In November 2021, the 7 Groundwater Sustainability Agencies (GSAs) within the Cosumnes Subbasin formed the Cosumnes Groundwater Authority (CGA). Charged with the responsibility of implementing the Cosumnes Subbasin Groundwater Sustainability Plan (a requirement of the California Sustainable Groundwater Management Act), the new CGA Board of Directors will be meeting on November 29 to establish the new organization and meet the Sustainable Groundwater Management Act requirements for the Cosumnes Subbasin. 

First Meeting – November 29 at 9:00a
Click here for more information about the CGA and November 29 meeting

Draft Groundwater Sustainability Plan

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.

[UPDATED] Comments received during the public comment period (August 18 – October 20) are provided below:

Don’t see your comment? Please contact

NOTE: Final compilation and response to comments will be captured as an appendix in the Final GSP.

As of Aug 18 (when the Working Group agreed to release the Draft GSP for public comment and review), Working Group meetings will include a standing agenda item to present and discuss comments received to date. 

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

Learn More

Refer to the Resources page for Cosumnes factsheets and handouts, outreach and engagement, and other SGMA resources.

Stay Connected

Refer to the Get Involved page to learn how you can stay connected and be involved in SGMA implementation in the Cosumnes Subbasin