b) IRWD can use imported water stored in Irvine Lake to supplement the recycled water system when demands for recycled water exceed available recycled water supplies. This supplement to the recycled water system historically has ranged from ~1,500 to 2,500 AFY. c) Some imported untreated water, via MWDOC and Metropolitan as stated above, is also used to directly meet demands for certain commercial and agricultural customers. This supply ranges from 200 to 500 AFY. Recycled Water In certain months, more recycled water is produced than needed and placed into storage reservoirs. In other months when more water is needed, stored water is used which reduces reliance on imported water: 1) Michelson Water Recycling Plant (MWRP), 28,000 AFY. More than a quarter of IRWD’s current water supply is recycled water, enough to provide landscape irrigation for more than 80% of the District’s business and community customers – including parks, school grounds, and golf courses. MWRP's treatment capacity is 28 million gallons per day. The MWRP enables IRWD to provide water to meet the future needs of our growing community, while decreasing IRWD’s dependence on imported drinking water. This plant treats sewage to produce tertiary treated recycled water. 2) Los Alisos Water Recycling Plant (LAWRP), 6,100 AFY. A multi-step process is used to produce recycled water suitable for non-potable use. This plant is only operated during months when the demand for recycled water is high during the months of April through September. 3) Non-Potable Wells, 4,165 AFY. Shallow groundwater well water is pumped and used for non-potable purposes. This water is pumped throughout the year with some interruptions due to maintenance. 4) Excess recycled water produced is stored to meet recycled customer demands. Stored recycled water is used to meet seasonal demands and reduce reliance on imported water. IRWD has four recycled water seasonal storage reservoirs that can store excess recycled water produced by IRWD’s MWRP. 5) Any additional water required by the recycled water system during the peak summer months is purchased from Metropolitan as needed. Up to 5,000 AFY is purchased to supplement the recycled water system. Emergency Supplies – Water Banking IRWD has diversified its water supply portfolio by developing water banking facilities in the Kern Fan area located in the southern San Joaquin Valley of Kern County as discussed above. IRWD’s Water Banking Program supplies, which include IRWD’s Water Bank and IRWD’s share
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IRWD – 2025 Water Shortage Contingency Plan
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