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

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Visit the Resources page for more information

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.

Learn More

Refer to the Resources page for past Cosumnes factsheets and handouts, outreach and engagement, and other SGMA resources (2016-2021).

Visit the new website for the most updated resources