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Santa Ana 2020 Urban Water Management Plan <br />arcadis.com <br />4-10 <br />Table 4-7: Projected Water Use Needed for Low Income Households (AF) <br />Water Use Sector FY Ending <br />2025 2030 2035 2040 2045 <br />Total Residential Demand (AF) 22,609 22,090 21,601 21,081 21,068 <br />Single-Family Residential Demand - <br />Low Income Households (AF) 3,664 3,576 3,489 3,401 3,400 <br />Multi-Family Residential Demand - <br />Low Income Households (AF) 3262 3190 3128 3056 3053 <br />Total Low Income Households <br />Demand (AF) 6,925 6,766 6,616 6,457 6,453 <br />Water Loss <br />The City has conducted annual water loss audit since 2015 per the American Water Works Association <br />(AWWA) methodology per SB 555 to understand the relationship between water loss, operating costs, <br />and revenue losses. Non-revenue water for FY2015/16 – FY2019/20 (Figure 4-2) consists of three <br />components: real losses (e.g., leakage in mains and service lines, and storage tank overflows), apparent <br />losses (unauthorized consumption, customer metering inaccuracies and systematic data handling errors), <br />and unbilled water (e.g., hydrant flushing, firefighting, and blow-off water from well start-ups). The City’s <br />real losses ranged from 157 AFY to 1,007 AFY and apparent losses ranged from 803 AFY to 858 AFY <br />between FY2015/16 – FY2019/20. The unbilled water ranged from 82 AFY to 411 AFY in the same <br />timeframe. <br />In the latest water loss audit (FY2019/20), the City’s total water loss was 1856 AFY (Table 4-8), compared <br />to the total water use of 33,489 AF in FY2019/20. The total water loss consists of real loss of 1,007 AFY <br />and apparent loss of 849 AFY in FY2019/20. The non-revenue water was 1,940 AFY. The active and <br />inactive service connections were relatively consistent in the last five years with 45,037 connections in <br />FY2019/20. The real loss performance indicator was 20 gals/connection/day in FY2019/20. Figure 4-3 <br />presents the performance indicators of gallons of real and apparent loss per connection per day. <br />Understanding and controlling water loss from a distribution system is an effective way for the City to <br />achieve regulatory standards and manage their existing resources. The California State Water Resources <br />Control Board (SWRCB) is still developing water loss performance standards; these standards have not <br />yet been adopted.