GSA Structure

The Delta-Mendota Subbasin governance structure is designed to support coordinated implementation of the Basin’s Groundwater Sustainability Plan while maintaining local representation and agency participation across the Subbasin.

Coordination Committee

The Delta-Mendota Subbasin governance structure was established through a Basin-wide Memorandum of Agreement (MOA) adopted by the participating Groundwater Sustainability Agencies (GSAs). The MOA created a coordinated governance framework intended to support implementation of a single Groundwater Sustainability Plan while maintaining local agency representation and decision-making authority throughout the Basin.

Under this structure, the Basin is organized into seven GSA Groups representing the 23 GSAs across the Delta-Mendota Subbasin. Each GSA Group designates representatives to participate on the Delta-Mendota Coordination Committee, which serves as the primary Basin-wide coordination body responsible for collaborative planning, technical coordination, and SGMA implementation activities.

This governance structure is intended to support Basin-wide consistency while allowing individual GSAs to continue managing local groundwater issues within their respective service areas. Coordination between agencies supports implementation of the Groundwater Sustainability Plan, compliance with SGMA requirements, public engagement activities, and long-term groundwater sustainability planning throughout the Basin.

View MOA

Technical Workgroup

The Coordination Committee is supported by a Technical Workgroup consisting of technical staff, consultants, and subject matter experts who assist with groundwater modeling, monitoring coordination, data management, annual reporting, Sustainable Management Criteria evaluation, project and management action development, and other technical implementation efforts.

• Technical Staff
• Consultants
• Subject Matter Experts

GSA Groups

The Delta-Mendota Subbasin governance framework includes seven GSA Groups representing 23 Groundwater Sustainability Agencies across the Basin. The structure is intended to maintain local representation while supporting coordinated Basin-wide SGMA implementation.

Aliso Water District GSARepresents the Aliso Water District service area within the Delta-Mendota Subbasin.Learn MoreCentral Delta-Mendota GSACoordinates groundwater sustainability activities for multiple member agencies in the central portion of the Subbasin.Learn MoreFarmers Water District GSASupports SGMA implementation and groundwater management within the Farmers Water District service area.Learn MoreGrasslands GSARepresents the Grassland region and supports coordinated groundwater management and monitoring activities.Learn MoreNothern Delta-Mendota GSA GroupIncludes agencies and irrigation districts in the northern portion of the Subbasin.Click HereSan Joaquin River Exchange Contractors GSA GroupLorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.Click Here

Delta-Mendota GSAs

GSA Group	GSA Name	Member Agency
Aliso Water District	Aliso Water District GSA	Aliso Water District
Farmers Water District	Farmers Water District GSA	Farmers Water District
Fresno County	County of Fresno GSA – Delta-Mendota Management Area A	County of Fresno
	County of Fresno GSA – Delta-Mendota Management Area A	County of Fresno
Grassland	County of Merced – Delta-Mendota	County of Merced
	Grassland GSA	Grassland Water District
		Grassland Resource Conservation District
Central Delta-Mendota	Central Delta-Mendota GSA	San Luis Water District
		Panoche Water District
		Tranquility Irrigation District
		Fresno Slough Water District
		Eagle Field Water District
		Pacheco Water District
		Santa Nella County Water District
		Mercy Springs Water District
		County of Merced
		County of Fresno
	Oro Lomo Water District GSA	Oro Loma Water District
	Widren Water District GSA	Widren Water District
Northern Delta-Mendota	City of Patterson GSA	City of Patterson
	DM-II GSA	Del Puerto Water District
		Oak Flat Water District
	Northwestern Delta-Mendota GSA	County of Merced
		County of Stanislaus
	Patterson Irrigation District GSA	Patterson Irrigation District
		Twin Oaks Irrigation District
	West Stanislaus Irrigation District GSA	West Stanislaus Irrigation District
San Joaquin River Exchange Contractors	City of Dos Palos GSA	City of Dos Palos
	City of Firebaugh GSA	City of Firebaugh
	City of Gustine GSA	City of Gustine
	City of Los Banos GSA	City of Los Banos
	City of Mendota GSA	City of Mendota
	City of Newman GSA	City of Newman
	County of Madera GSA – Delta-Mendota	County of Madera
	County of Merced GSA – Delta-Mendota	County of Merced
	San Joaquin River Exchange Contractors GSA	Central California Irrigation District
		Columbia Canal Company
		Firebaugh Canal Water District
		San Luis Canal Company
	Turner Island Water District GSA – Delta-Mendota	Turner Island Water District