to 6,500 customers through 585 miles of pipelines. To further offset the need for imported water for non-potable uses, IRWD has continued to expand its recycled water program as demands have increased. IRWD has developed a water banking program in Kern County in which it stores water in wet years for use during dry years and emergencies. Water banking is an important tool for ensuring reliability by augmenting imported water supplies during shortage conditions. By capturing excess water when it is available and storing it in groundwater basins to supplement supplies in dry years, the IRWD water banking program safeguards customers from imported water supply shortages. The banking program is designed to provide enough supplemental water to meet IRWD customers’ needs during critically dry years, supply interruptions or when Metropolitan implements its Water Supply Allocation Plan (WSAP). 3.2 Service Area Boundaries IRWD’s service area boundary is depicted in Figure 3-2 below. In 1997, IRWD acquired neighboring Santa Ana Heights Mutual Water Company with approximately 2,800 connections. In 2001, IRWD merged with the Los Alisos Water District, located in the City of Lake Forest, with approximately 12,400 connections. In 2006, IRWD merged with Santiago Water District, located within the unincorporated area of Orange County, with 740 connections. In 2008, IRWD merged with Orange Park Acres Mutual Water Company, located within the City of Orange, with approximately 530 connections. The unincorporated portions of IRWD’s service area, as shown on Figure 3-2 , fall within the County of Orange jurisdiction. IRWD’s records show 132,347 connections which served a total of 84,438 AF of water in FY 2024-25.
Service Area Cities: Costa Mesa Irvine Lake Forest
Newport Beach Orange Santa Ana
Tustin
Service Area County: Orange County, California
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IRWD – 2025 Urban Water Management Plan
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