Our taps, plumbing fixtures, and irrigation systems all draw from the same sources of clean, potable water. After being used, most of the water ends up in the sewer system — all of it, at that point, contaminated. Then it is treated and returned to a body of water. This creates a cycle in which unnecessarily large volumes of water circulate through the built environment and municipal treatment facilities. However, in the last decade or so, major strides have been made in reducing the amount of water that must go through such a cycle.

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