Omochumne - Hartnell Water District
Servicing the Community of the Cosumnes River

The Cosumnes Basin is located in the southern part of Sacramento County south of the Cosumnes River to the Sacramento County Line.  It also includes some westerly portions of Amador County.  It consists of 7 Groundwater Sustainability Agencies.

For more information please visit:


Find your GSA by clicking the link below

Fact Sheet about the Sustainable Groundwater Management Act and its implementation in the Cosumnes Basin. 

Link to California Department of Water Resources information page on the Sustainable Groundwater Management Act

Cosumnes Subbasin Online Public Meeting

March 24, 2021 | 6:30p

Now is a critical time to get involved in the groundwater management plan for the Cosumnes Subbasin!

The local Groundwater Sustainability Agencies (GSAs) will provide an update of their plan for managing groundwater in the Cosumnes Subbasin at a virtual public workshop in late March. The meeting will be an opportunity for residents, including those who rely on wells for their water, to understand and comment on proposals that will govern how groundwater is used for the next two decades in the Cosumnes watershed.

Register today and help spread the word!

To Register: