Because water consumption varies by home, the best way to determine whether a Special Meter would be a good choice for you is to look at your quarterly water usage. If you see a significant spike in usage in the 3rd quarter, and somewhat elevated usage in Q4, chances are some of that water is being used for filling a pool and/or watering the landscaping in the summer months.
To calculate your potential savings, use Q1 and Q2 as your baseline and calculate the average of those 2 numbers. Then, normalize your usage across all 4 quarters to see how much water is potentially unsewered.
Example 1: Spike in Q3, slight elevation in Q4.
Q1 & Q2 average 15.5 k/gal. Estimated unsewered consumption 32.3 k/gal in Q3 (47.8 - 32.2 = 15.5) and 10.7 k/gal in Q4 (26.2 – 10.7 = 15.5). Total estimated unsewered usage 43 k/gal. 43 x 4.51
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Qtr 1
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Qtr 2
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Qtr 3
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Qtr 4
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Total
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Rate
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13.0
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18.1
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47.8
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26.2
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105.1
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$4.51
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In this example, the bill prior to the installation of a Special Meter would be the Total k/gallonage multiplied by the Rate, 105.1 x $4.51 = $474.00. With a Special Meter, assuming a meter reading of 43 k/gal, the unsewered amount would be subtracted from the bill as follows. 105.1 - 43 = 62.1 x 4.51 = $280.07. This would be a savings of $193.93. Depending on the cost of the meter and installation, this meter would likely pay for itself in just a couple of years.
Example 2: stable usage, no significant savings
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Qtr 1
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Qtr 2
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Qtr 3
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Qtr 4
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Total
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Rate
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15.5
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18.9
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16.7
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17.5
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68.6
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$4.51
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In this example, the water consumption is stable across all 4 quarters. This resident likely does not do a significant amount of exterior watering or have a pool. They would not realize any savings by installing a Special Meter.