“Wasting water” is short for “Wasting clean potable water.” The fact that the water re-enters infrastructure does not make it free, because it has to be cleaned and sterilized before it can be used again. It costs money to build the sewer infrastructure in the first place, and it costs money to maintain it in working condition. It costs money to build and maintain water treatment plants, to power the machinery and replenish chemicals used while cleansing the water for re-use. It costs money to build and maintain the water mains that supply clean water to your home, and power the pumps that move water through them.
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