2025 Orange County Water Demand Projection Model
2.1 Data Collected from Retail Agencies Orange County retail agencies responded to a questionnaire spreadsheet that asked for their historical billed water consumption volumes and account data by customer class for the 2010 to 2024 period, as well as water rate schedules covering the same period, and, where possible, a summary of water shortage management activities implemented over the last decade. Figure 2-1 summarizes the historical duration of data provided by each agency as well as an identification of the billing cycle (monthly or bimonthly) that defines the general frequency of water bills.
Westminster Yorba Linda
Moulton Niguel Newport Beach Orange City San Clemente San Juan Capistrano Santa Ana Santa Margarita Seal Beach Serrano South Coast Trabuco Canyon Tustin
La Habra La Palma Laguna Beach Mesa Water
Garden Grove GSWC Cowan GSWC Placentia GSWC West Orange Huntington Beach IRWD
Buena Park East Orange El Toro Fountain Valley Fullerton
Jan-10 Jan-11 Jan-12 Dec-12 Jan-14 Jan-15 Jan-16 Dec-16 Jan-18 Jan-19 Jan-20 Dec-20 Jan-22 Jan-23 Jan-24 Anaheim Brea
Monthly
Bimonthly
Bimonthly and Monthly
Bimonthly/Monthly Transition during period of record
Figure 2-1: Summary of Time Range of Available Billing Data Provided by Retail Agencies
The water use and account data provided by the agencies varied. Billing sectors and their definitions can be agency-specific (almost 40 billing classifications were collected from 29 retail agencies), and water use data was not always consistently available back to 2010 for all retailers. Billing cycles differ between agencies: monthly, bimonthly, or a combination of the two. After the water use and account data were obtained, the data needed to be standardized into consistently defined demand sectors and to a monthly basis. The following sections discuss how billing-sector data
2-2
Appendix G - 21
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