+Waste water is water that has been affected by human use, carrying dissolved or suspended matter. It flows from homes, industries, and rain, requiring [Treatment](/wiki/treatment) before release to prevent [Pollution](/wiki/pollution). This used water, no longer pristine, impacts ecosystems if not properly managed.
+## See also
+- [Sewage](/wiki/sewage)
+- [Water Cycle](/wiki/water_cycle)
+- [Sanitation](/wiki/sanitation)
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