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The spent or used water from a home, community, farm, or industry that contains dissolved or suspended matter.
EPA
Wastewater is any water that has been adversely affected in quality by any anthropogenic influence. It therefore includes liquid waste discharged from domestic houses, industrial, agricultural or commercial processes. It does not include rain-water uncontaminated by human activities.
There is a wide range of wastewaters and an equally wide range of technologies and techniques for mitigating the impacts of wastewaters on the receiving environment.
Source: Wikipedia
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