The next step was to factor in the cooling-tower water and water-treatment costs for each water-cooled chiller. Table 3 shows the most recent City of Houston commercial water rates, with volume water and sewer charges. A comparison of water rates in Houston and other major U.S. cities proved challenging because of differences in municipal water-rate structures attributed to various peak, off-peak, service, commodity, and block consumption charges. However, one major Pacific Northwest city ...

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