undergoes further treatment and is ultimately discharged to the ocean. IRWD also maintains a connection to SOCWA’s ocean outfall to discharge secondary effluent and brine flows. There are no other local water, wastewater, or groundwater agencies that operate within IRWD’s service area. IRWD is currently expanding the Syphon Reservoir to capture additional recycled water produced at MWRP and LAWRP for use in high summer demand periods to avoid ocean discharges. This project will be online in 2031. DWR Table 6-2 below shows total sewage collection within IRWD’s service area for 2025. This includes the volume of IRWD-collected sewage as well as the sources that go to other agencies for treatment and reuse.
Table 6 - 2. DWR Submittal Table Wastewater Collected Within Service Area in 2025
DWR Table 6-3 below provides the volume of treated sewage either recycled or disposed of within IRWD’s service area in 2025, and the disposition of the treated water – treated, discharged, or recycled from either the MWRP or LAWRP.
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IRWD – 2025 Urban Water Management Plan
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