17,000 gallons per month is too high. The bill should show separate amounts for potable water and irrigation water. The irrigation amount should be less than 5,000 gallons per month for that period, based on running it 2 times per week for about 15 minutes. The potable water amount really depends on how you use water, but I think most people use less potable water than irrigation water. During the same time period, I used about 10,000 gallons total for 3 months, including potable and irrigation water in a courtyard villa.
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