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Eastern San Joaquin Groundwater Basin Groundwater Management Plan
<br />Northeastern San Joaquin County Section 1
<br />Groundwater Banking Authority 32 Introduction
<br />The estimated safe yield of the Basin within the entire District is 72,000 af/yr. Municipal usage,
<br />particularly within the City of is about 2½ 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 af/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 af/yr. SSJID and OID also provide water to the City of
<br />Stockton through a 10-year transfer agreement for up to 30,000 af/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 af/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 af with a projected 2020
<br />demand of 22,727 af 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 af/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 af/yr. From 1992 to 2002, the District delivered 439,048 af of treated water
<br />or about 40,000 af/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
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