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Central Delta-Mendota GSA


Point of Contact Information

AGSA Eligibility Determination

  1. Water Supply: To supply water to meet the various users? demands within the Central Delta-Mendota Region, several water sources are utilized. Water supplies within the Region area are primarily obtained from two sources: 1- Groundwater, which supports municipal, industrial, rural domestic, and agricultural production needs. 2- Imported surface water diverted from the Sacramento River-San Joaquin River Delta (Delta) and conveyed through the DMC and the San Luis Canal (SLC) under the Central Valley Project (CVP). The DMC and SLC provide water for urban use in the community of Santa Nella located within the San Luis Water District and for agricultural production. Other sources of water supplies occur, such as direct precipitation and local stream flows, but these meet a relatively small portion of agricultural water demand and a minor recharge source for groundwater. As political and environmental conditions change, so does the availability of supplies from these various sources. During drought, the water supply available from the CVP can be limited. In addition, CVP water supplies delivered south of the Delta can be limited in an effort to protect endangered species that depend on favorable water conditions within the Delta. During periods when CVP surface water supplies are limited, many water users who would normally depend on the CVP supplies increase groundwater pumping to augment supplies to meet their water demands. Land Use: Most of the land in the San Joaquin Valley is utilized for agricultural crop production. Major agricultural activities include the operation of dairies, and the production of cotton, tomatoes, beans, alfalfa, corn, wheat, grapes, walnuts, almonds and citrus. A number of small rural communities, as well as some large municipalities exist within the San Joaquin Valley. Within the Central Delta Mendota GSA boundaries, the majority of the current land use is agricultural, with irrigated crops, dairies and rangeland. Santa Nella and Tranquillity lie within the GSA management area. Additionally, the municipalities of Los Banos, Dos Palos, Firebaugh, and Mendota lie within a few miles of the Region, as well as a number of unincorporated communities. Water Management: To aid in managing the groundwater component of these water resources, a Groundwater Management Plan (GMP) for the Southern Agencies (SA) of the Delta Mendota Canal (DMC) service area was developed on behalf of SLDMWA. These Southern Agencies include various GSA members. The GMP-SA characterizes the groundwater basin, summarizes the existing groundwater management activities in the Groundwater Management Area (GMA), develops the relative elements of the GMP, identifies management objectives, and provides project recommendations for implementation. It is intended to establish the framework for collecting the necessary groundwater monitoring data needed to assess the impacts of the various activities that affect the groundwater basin and manage the resource such that sustained use of groundwater can be optimized without adverse impacts to the water quality and yield. This GMP-SA was last updated in July 2014 to reflect the understanding of current conditions within the GMA, and incorporate the appropriate management goals and components necessary to address recent changes that have occurred in regulations, Participating Agencies? (PAs) policies, and groundwater conditions since the last update. Under this plan the PAs, including SLDMWA, assumed a more active role managing regional groundwater resources within the basin. As part of this update to the GMP-SA, SLDMWA assumed the role as the entity responsible for the groundwater monitoring function within the GMA-SA on behalf of the PAs, in conformance with Senate Bill SBx7-6. The groundwater monitoring function is a cooperative effort of the PAs and SLDMWA under SLDMWA?s administration.
  2. No

BDecision to Become a GSA

  1. 03/13/2017
  2. 03-02-2017.2941171.pdf (735.1kB) Uploaded on 03/06/2017 at 12:58PM 03092017 Proof of Publication.pdf (176.4kB) Uploaded on 03/14/2017 at 10:30AM
  3. Central DM GSA Fully Executed JPA.pdf (4.1MB) Uploaded on 11/12/2019 at 09:54AM
  4. The Central DM Region Multi-Agency GSA, on March 8 and continued on March 13, 2017, conducted a public hearing on the decision to become the GSA after publication of notice in accordance with Water Code Section 10723(b) (Attachment 1). During the March 13 meeting, the Steering Committee authorized formation of the Central DM Region Multi-Agency GSA for the Central DM Region of the Delta-Mendota Subbasin (Exhibit "B" of Attachment 2) within Merced and Fresno County. The agenda item and meeting minutes are included in Attachment 3,as well as the signed Agreement, is included as Attachment 2. No new bylaws, ordinances, or other authorities were adopted in conjunction with the District's decision to become the GSA. Please note, Oro Loma will now be a part of the Activity Agreement with SLDMWA and not with the Multi-Agency GSA. The shapefiles and maps have been changed to reflect this occurrence (Oro Loma Board of Directors took action March 28th on this item) and the Central DM Region Multi-Agency GSA Agreement will be amended in the next month to reflect this. UPDATE: In August of 2019, the Central Delta-Mendota Multi-Agency GSA parties elected to change the formation of the GSA from a multi-agency GSA to a formal JPA, thus changing the official name to the Central Delta-Mendota GSA. The change of governance is not a material change, where as the parties, decision making process, and GSA area all remain the same under the new JPA agreement. Copies of the JPA formation document and individual agency adoption resolutions are also attached in the SGMA portal. Fresno County - Central MA GSA Minute Order.pdf (49.3kB) Uploaded on 03/28/2017 at 01:09PM Public Hearing 2 - Approved Minutes.pdf (79.4kB) Uploaded on 03/24/2017 at 02:22PM Central GSA Meeting March 13.pdf (128.2kB) Uploaded on 03/24/2017 at 02:24PM Public Hearing 1 - Approved Minutes.pdf (67.1kB) Uploaded on 03/24/2017 at 02:22PM Eagle Field WD Res. No. 01-2019.pdf (351.4kB) Uploaded on 11/12/2019 at 10:03AM Fresno Slough Res. No. 2019-20-02.pdf (163.4kB) Uploaded on 11/12/2019 at 10:03AM SLWD Res. No. 19-1185.pdf (418.6kB) Uploaded on 11/12/2019 at 10:03AM SNCWD Res No. 19-04.pdf (1.1MB) Uploaded on 11/12/2019 at 10:03AM Tranquillity Res No. 2019-03.pdf (172.5kB) Uploaded on 11/12/2019 at 10:03AM Fresno County Res. 19-330.pdf (432kB) Uploaded on 11/12/2019 at 10:03AM Merced County Res. No. 2019-64.pdf (397.1kB) Uploaded on 11/12/2019 at 10:03AM Resolution 766-19 Authorizing Adoption of the Central Delta-Mendota Groundwater Sustainability Agancy Joint Powers Authority.pdf (1.2MB) Uploaded on 11/12/2019 at 10:04AM Resolution 91-19 Authorizing Pacheco Water District's Adoption of The Central Delta-Mendota Groundwater Service Joint Powers Aut.pdf (1.3MB) Uploaded on 11/12/2019 at 10:04AM Resolution 43-19 Execution of Delta-Mendota Subbbaisn Coordination Agreement Under the Sustainable Groundwater Management Act.pdf (1.5MB) Uploaded on 11/12/2019 at 10:04AM Central DM GSA Resolution 2020-01 - Confirming Authority of Central DM GSA.pdf (760.2kB) Uploaded on 01/23/2020 at 08:37AM Eagle Field Water District - M-A GSA RES 02-2017.pdf (1MB) Uploaded on 03/28/2017 at 01:09PM San Luis WD MA GSA Resolution.pdf (320.5kB) Uploaded on 03/30/2017 at 02:57PM Central DM Activity Agreement Final Signed Package.pdf (1.9MB) Uploaded on 03/30/2017 at 03:32PM Panoche Resolution 719-17.pdf (2.3MB) Uploaded on 03/28/2017 at 01:11PM Fresno Slough MA GSA Resolution.pdf (286.3kB) Uploaded on 03/28/2017 at 01:36PM SNCWD_Res17-03_GSA.pdf (529.8kB) Uploaded on 03/28/2017 at 01:09PM Tranquillity Resolution MA GSA.pdf (284.9kB) Uploaded on 03/28/2017 at 01:36PM Pacheco Resolution MA GSA.pdf (268.4kB) Uploaded on 03/28/2017 at 01:35PM Central GSA Meeting March 8.pdf (81.6kB) Uploaded on 03/24/2017 at 02:24PM MSWD GSA Agreement.pdf (2MB) Uploaded on 03/28/2017 at 01:16PM

CType of GSA Formation and Contact Information

    Central Delta-Mendota GSA
  1. Aaron Barcellos

DMap & Service Area Boundaries

  2. Delta Mendota Subbasin Revised Boundary.pdf (1.2MB) Uploaded on 03/09/2017 at 02:54PM Central DM Local Agency Boundaries.pdf (1.6MB) Uploaded on 03/30/2017 at 12:47PM Central DM GSA Multi Agency Boundary.pdf (2.1MB) Uploaded on 03/30/2017 at 12:44PM
  3. Merced County - Merced County GIS Department Fresno County - Fresno County GIS Department Pacheco, Panoche, Eagle Field, Mercy Springs, Fresno Slough, Tranquillity, San Luis - DWR Federal Water Users Database Santa Nella County Water District - DWR San Joaquin Valley Water Districts Database Fresno_Slough_Water_District - Central DM MultiAgency GSA.zip (4.6kB) Uploaded on 03/27/2017 at 09:26AM Mercy_Springs_Water_District - Central DM MultiAgency GSA.zip (3.2kB) Uploaded on 03/27/2017 at 09:26AM Panoche_Water_District - Central DM MultiAgency GSA.zip (4.2kB) Uploaded on 03/27/2017 at 09:27AM San Luis Water District - Central DM MultiAgency GSA.zip (11.4kB) Uploaded on 03/27/2017 at 01:31PM Santa_Nella_County_wd - Central DM Region MultiAgency GSA.zip (9.3kB) Uploaded on 03/27/2017 at 01:45PM Tranquillity_Irrigation_District - Central DM MultiAgency GSA.zip (4.2kB) Uploaded on 03/27/2017 at 09:25AM Eagle_Field_Water_District - Central DM MultiAgency GSA.zip (3.3kB) Uploaded on 03/27/2017 at 09:27AM Pacheco_Water_District - Central DM MultiAgency GSA.zip (4.3kB) Uploaded on 03/27/2017 at 09:28AM Fresno County - Central DM Region MultiAgency GSA.zip (12kB) Uploaded on 03/27/2017 at 01:45PM Merced County - Central DM Region MultiAgency GSA.zip (36.5kB) Uploaded on 03/27/2017 at 02:10PM
  4. CDMRMAGSA_Boundary.zip (32.7kB) Uploaded on 03/30/2017 at 12:32PM
  5. The GSA consists of 10 various agencies with respective service areas. Merced County and Fresno County cover certain 'white-areas' as indicated in the map. Their are slight variances in service areas and GSA boundaries in the few instances described below. First, San Luis Water District's service area expands west outside of the boundary of the Delta-Mendota subbasin and therfore the GSA boundary is truncated at the westerly edge of the subbasin boundary at the San Luis Water District Service Area. Second, Merced County is incorporating the Volta area into the Central DM GSA as well as a portion of the San Joaquin River Irrigated Lands Program that was not previously covered by the San Joaquin River Exchange Contractors Groundwater Sustainability Agency. The inclusion of this area into this Multi-Agency GSA was done so at the request of the Irrigated Lands representatives.

ERequired Documents

  1. Water Code 10723.8(a)(1) also requires information regarding other agencies managing or proposing to manage groundwater within the basin. At the time of this Central Delta-Mendota GSA Notification submittal to DWR, it is our understanding that the San Joaquin River Exchange Contractors have formed a GSA for a portion of the Subbasin. Also, Patterson Irrigation District, West Stanislaus Irrigation District and the City of Patterson have formed or submitted a Notification of Intent to form GSA?s in the northern portion of the Subbasin and the Grasslands Water District, City of Dos Palos, City of Firebaugh, City of Gustine, City of Los Banos, City of Newman, City of Mendota, City of Tranquillity, Aliso Water District and Farmers Water District have formed GSA?s in the southern portion of the Subbasin. Within the Delta-Mendota subbasin, we understand that other agencies may be considering or proposing to form GSAs to manage groundwater resources in their own services areas. To our knowledge at this time, the following entities have held either a public hearing or expressed interest in forming a GSA: Stanislaus County, Merced County, Fresno County, and Del Puerto Water District.
  2. No new by laws, ordinances, or new authorities were adopted by any local agencies.