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Sustainable Groundwater Management

Website is in the process of being updated. More information coming soon.


The first comprehensive groundwater legislation in California history, the Sustainable Groundwater Management Act of 2014 (SGMA), was enacted on 16 September 2014 as part of a three-bill package including Assembly Bill (AB) 1739 (Dickinson), Senate Bill (SB) 1169 (Pavley), and SB 1319 (Pavley). The legislation provides a framework for the sustainable management of groundwater by local agencies, with an emphasis on the preservation of local control. The state agencies primarily responsible for implementing SGMA are the California Department of Water Resources (DWR) and the State Water Resources Control Board (SWRCB).

The City of Lathrop overlies two groundwater subbasins of the San Joaquin Valley Basin – the Tracy Subbasin (DWR 5-022.15) and the Eastern San Joaquin (ESJ) Subbasin (5-022.01). The shared border of the two subbasins is currently delineated along the San Joaquin River, which is treated as a natural hydrologic divide. Basins that were designated as high or medium priority are subject to the requirements of SGMA. The ESJ Subbasin is designated as high priority, while the Tracy Subbasin is designated as medium priority.

All of the City’s groundwater production wells are located in the ESJ Subbasin. Groundwater recharge from landscape irrigation and recycled water disposal activities carried out by the City occurs in both the ESJ and Tracy Subbasins.

The first major SGMA milestone was the requirement to form Groundwater Sustainability Agencies (GSAs) by 30 June 2017. The City has formed an exclusive GSA for its jurisdiction within the ESJ Subbasin. Currently, the City’s GSA is participating in the Eastern San Joaquin Groundwater Authority, formed under a Joint Powers Agreement among all GSAs in the ESJ Subbasin. The portion of the City overlaying the Tracy Subbasin is managed by the Stewart Tract GSA, formed by Reclamation District 2062.

Map

The City is considering applying for a Basin Boundary Modification Request from DWR to include all of the City in the Tracy Subbasin and remove the City from the ESJ Subbasin. An Initial Notification of Potential Basin Boundary Modification Request has been filed with DWR on February 8th, 2018. The final Basin Boundary Modification Request must be submitted before DWR’s June 30, 2018 deadline. This website will be updated as more information becomes available.

Resources

City of Lathrop GSA Notification

City of Lathrop 2015 Urban Water Management Plan

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