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2015 URBAN WATER MANAGEMENT PLAN <br />3 WATER SOURCES AND SUPPLY RELIABILITY <br />3.1 Overview <br />The City relies on a combination of imported water, local groundwater, and recycled water to meet its <br />water needs. The City works together with two primary agencies, Metropolitan and OCW D to ensure a <br />safe and reliable water supply that will continue to serve the community in periods of drought and <br />shortage. The sources of imported water supplies include water from the Colorado River and the SWP <br />provided by Metropolitan. <br />The City's main source of water supply is groundwater from the OC Basin. Imported water and recycled <br />water make up the rest of the City s water supply portfolio. Currently, the City relies on approximately 71 <br />percent groundwater, 28 percent imported water, and 1 percent recycled water. The City's water supply <br />portfolio is expected to change slightly to 70 percent groundwater, 29 percent imported water, and 0.7 <br />percent recycled water by the year 2040. The sources of imported water supply include the CRA and the <br />SWP. The City's projected water supply portfolio is shown on Figure 3-1. <br />100% <br />90% r <br />80% <br />70% <br />60% <br />50% <br />40% <br />30% <br />20% <br />10% <br />0% <br />2020 2025 2030 2035 2040 <br />■Groundwater ■Imported ■Recycled Water <br />Figure 3-1: Water Supply Sources in the City (AF) <br />The following sections provide a detailed discussion of the City's water sources as well as the future <br />water supply portfolio for the next 25 years. Additionally, the City's projected supply and demand under <br />various hydrological conditions are compared to determine the City's supply reliability for the 25 year <br />planning horizon. <br />arcadis.com OI�t 3-1 <br />