(TM) ( see Appendix G) and utilize a spreadsheet model developed by MWDOC in conjunction with IRWD that is specific to IRWD. IRWD’s WRMP and MWDOC’s demand projections use different methodologies so there are differences, but they are not significant enough to alter the analysis or conclusions. As discussed further in Section 7, IRWD does not utilize the MWDOC adjustments to average year demands for single dry year and five consecutive dry year projections. Instead, IRWD modifies the average year projections developed by MWDOC based on an analysis of changes in demand within IRWD’s service area in response to single and multiple dry years. Throughout the UWMP, IRWD relies on its own supply forecasts from the WRMP. The following section describes and quantifies IRWD’s past, current, and future projected customer water use through the year 2045. Since 2020, requirements include an emphasis on coordinating with local and regional authorities to determine the appropriate land use basis for water demand projections. Suppliers must also quantify water system losses for each of the five preceding years.
4.1 Description of Defined Water Use Sectors
Customer water use by sector type is presented throughout the following UWMP sections. Following are the definitions, developed by DWR, for each sector that is applicable to IRWD:
Single-Family Residential: Single family is defined as a lot with a free-standing building containing one dwelling unit that may include a detached secondary dwelling. This is a retail demand. Multi-Family Residential: Multiple dwelling units contained within one building or several buildings within one complex. This is considered a retail demand. Commercial: A water user that provides or distributes a product or service. This is considered a retail demand. Industrial: A water user that is primarily a manufacturer or processor of materials as defined by the North American Industry Classification System (NAICS) code sectors 31 to 33, inclusive, or an entity that is a water user primarily engaged in research and development. This is considered a retail demand. Institutional (and Governmental): A water user dedicated to public service. This type of user includes higher-education institutions, schools, courts, churches, hospitals, government facilities, and nonprofit research institutions. This is a retail demand. Landscape: Water connections supplying water solely for the purpose of landscape irrigation. This is a retail demand. Sales to Other Agencies: Water sales made to another agency (referred to here as water supplier). This is considered a wholesale demand but may apply to certain retailers.
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IRWD – 2025 Urban Water Management Plan
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