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


Public Comment Period Opens for Groundwater Sustainability Plans

Groundwater sustainability plans that have recently been submitted to the Department are now posted on the DWR SGMA Portal.  

These plans are open to public comment for 75 days after the posted date. Information about how to comment on the plans can be found in a fact sheet in English and Spanish. Public comments are welcomed and encouraged. A SGMA Portal account is not necessary to submit comments. 

Comments are due by April 23, 2022

Final Groundwater Sustainability Plan

The Final Groundwater Sustainability Plan (GSP) (subject to GSAs’ formal adoption and submittal to DWR) is available to view/download.

Quicklinks to Quick Reads for the Cosumnes GSP

The Full Read 

Click HERE or the green button to view and download the full technical documents for the Cosumnes Final 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

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