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Eastern San Joaquin Groundwater Basin Groundwater Management Plan
<br /> The estimated safe yield of the Basin within the entire District is 72,000 of/yr. Municipal usage,
<br /> particularly within the City of is about 2'/2 times the safe yield. Based on data from 32 wells in
<br /> the District, the groundwater levels have decreased between 20 to 30 feet in the last 40 years.
<br /> To address the water supply needs of the urban areas of the District and the Region, SSJID will
<br /> begin in 2005 the delivery of up to 44,000 of/yr of treated surface water from Woodward
<br /> Reservoir to the Cities of Escalon, Manteca, Lathrop, and Tracy. The net benefit to the Basin is
<br /> expected to be approximately 30,000 of/yr. SSJID and OID also provide water to the City of
<br /> Stockton through a 10-year transfer agreement for up to 30,000 of/yr of New Melones Water.
<br /> Oakdale Irrigation District— Formed in 1909 under the Irrigation District Act, OID comprises
<br /> about 72,345 acres mostly in the northern portion of Stanislaus County with about 12%
<br /> overlying the Eastern San Joaquin Sub-basin. With the adoption of a Plan in 1995, OID has
<br /> taken a proactive approach to preventing groundwater contamination from abandoned wells by
<br /> educating property owners and improving enforcement policies. OID has also developed
<br /> guidelines for a wellhead protection program. Flood irrigation practices in OID have helped to
<br /> recharge the Basin. As stated above, SSJID and OID provide water to the City of Stockton
<br /> through a 10-year transfer agreement for up to 30,000 of/yr of New Melones Water.
<br /> 1.6.2 Overview of Existing Urban Water Management Plans
<br /> City of Lodi —The City of Lodi is located northeast of Stockton, along Highway 99. According
<br /> to the 2001 City of Lodi Urban Water Management Plan, 24 wells provide a population of 57,935
<br /> with water from the Basin. In 1999, City of Lodi wells produced 16,587 of with a projected 2020
<br /> demand of 22,727 of assuming a 1.5 percent constant growth rate. Since 1977, the City of Lodi
<br /> has enforced stringent water conservation programs and is considering implementing other
<br /> economically feasible Best Management Practices (BMPs). BMPs considered include Large
<br /> Landscape Conservation Programs and Incentives, Commercial, Industrial and Institutional
<br /> Conservation Programs, Residential Ultra Low Flush Toilet Rebate Programs, and Water
<br /> Metering.
<br /> The City of Lodi's future water use projections indicate that groundwater in the area should be
<br /> sufficient to meet the City's needs over the next 20 years. However, they have recognized that
<br /> groundwater levels are declining, and have participated in the East San Joaquin Parties Water
<br /> Authority to discuss and be a party to solutions. In 2003, the City of Lodi approved a 40-year
<br /> agreement with WID for the purchase of 6,000 of/yr of Mokelumne River Water. The City is
<br /> currently considering various methods to utilize the water either through direct recharge,
<br /> injection, or treatment to potable standards.
<br /> Stockton East Water District—The mission of SEWD was established by the legislature when
<br /> the District was created and to insure proper management of the Basin and provide
<br /> supplemental water supplies. In accordance with its mission, SEWD wholesales drinking water
<br /> to the City of Stockton, Cal Water, and San Joaquin County. By contract, the District delivers a
<br /> minimum of 20,000 of/yr. From 1992 to 2002, the District delivered 439,048 of of treated water
<br /> or about 40,000 of/yr to these urban contractors. As a wholesaler, SEWD has no authority over
<br /> mandatory prohibitions on water use for the Stockton Urban Area.
<br /> City of Stockton —The City of Stockton has a population of approximately 243,700 and has
<br /> three water suppliers to serve the area: City of Stockton Municipal Utility District (Stockton
<br /> MUD) (38,300 connections); California Water Service Company (42,250 connections within the
<br /> city, 10,950 outside of city limits); and County of San Joaquin (2,387 unmetered connections
<br /> through County Maintenance Districts). The Stockton MUD service area generally
<br /> Northeastern San Joaquin County Section 1
<br /> Groundwater Banking Authority 32 Introduction
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