05/27/2008 Council Packet - Laserfiche WebLink

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• • Based on discussions following the submission of the Water and Wastewater Utility Rate Study dated October 1, 2007, we have developed a revised water conservation rate structure. The revised structure includes separate blocks and rates for residential and non - residential customers. In addition, separate blocks were created for non - residential domestic /processed and irrigation use. The goal of the revised rate structure is to encourage conservation by reducing excessive irrigation use, while being mindful that much of the non - residential domestic water use is non - discretionary. The first step in configuring the block rate structure was to determine discretionary vs. non - discretionary (irrigation) use among residential and non- residential customers. This involved reviewing detailed consumption records provided by the City. Below are some highlights on past water use in the City: Winter water use (Quarter 1, 2006 data) • The average residential winter water use was 16,072 gallons in quarter 1 of 2006 and 15,901 in quarter 1 of 2007. • 98.6% of residential users used 40,000 gallons or less (98.7% in quarter 1 of 2007). • Only 52 customers (1.4% of users), used more than 40,000 gallons (53 in quarter 1 of 2007). • 95.3% of residential users used 30,000 gallons or less (95.0% in quarter 1 of 2007). • 181 customers (4.7% of users), used more than 30,000 gallons (201 in quarter 1 of 2007). Winter water use is a good indicator of non - discretionary water use. As shown above, 98.6% of all residential users consumed less than 40,000 gallons per quarter. Therefore, our assumption was that water consumption over 40,000 gallons per quarter is due primarily to irrigation. Summer consumption statistics include: Summer water use (Quarter 3, 2006 data) • Average residential water use is 46,700 gallons. • 43.3% of residential users use 40,000 gallons or less • 936 or 23.8% of residential customers use 80,000 gallons or more in the summer months, which is double what 98.6% of customers use in winter. • 247 or 6.7% of residential customers use 120,000 gallons or more in the summer months, which is triple what 98.6% of customers use in winter. The city's goal of 75 gallons per capita daily would equate to 20,250 gallons /quarter for a 3- person household, or 40,500 gallons /quarter for a six - person household. AMENDMENT TO: Water and Wastewater Utility Rate Study — Dated October 1, 2007 1