SGMA in the Cosumnes Subbasin

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(more resources available below)


The Draft Groundwater Sustainability Plan (GSP) is now available for public review and comment. Comments are due October 20, 2021. [Click here to learn more]

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.

Don’t forget to register for upcoming public workshops!  Meeting information is below

Three public webinars / in-person workshops will be held to discuss the Cosumnes Subbasin Draft Groundwater Sustainability Plan (GSP). These meetings will be hosted by the Cosumnes Subbasin Working Group, on behalf of the seven Groundwater Sustainability Agencies (GSAs). Webinars will be recorded and posted to the website for later viewing.

[PAST EVENT] August 26 | WEBINAR: Draft GSP Overview

Online webinar to present an introduction and overview of the Draft GSP. Click HERE to view materials

September 16 | IN-PERSON WORKSHOPS: Draft GSP Overview 

Two Time Slots: 3:30-5:00 pm or 6:30-8:00 pm (Wilton Community Center, 9717 Colony Road, Wilton, CA 95693)

Similar content as the August 26 webinar will be presented at the in-person workshops. These workshops will be structured as an open house to foster more one-on-one conversation. Choose to attend either the afternoon session (@3:30 pm) or the evening session (@6:30 pm). 

Register for either session: 

Background for those who are new to SGMA:

COVID Safety Policies - Masks Required (regardless of vaccination status)

The venue requires that all attendees must wear masks indoors, regardless of vaccination status.

We are excited to host in-person meeting options; however, safety is still of the utmost importance to us. Please help event staff and your fellow community members have a safe  public meeting by practicing COVID safety precautions at all times – Wear a mask, maintain safe distances, wash hands often, etc.

Stay at home if you feel sick! 
You can still participate in the virtual webinar on October 6.

October 6 | WEBINAR: Follow-Up 
6:30-8:00 pm

Online webinar for follow-up questions or comments on the Draft GSP. 

Register for the webinar: 


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