Explain why waste water must be treated before it is released into the environment.

In the subtopic Waste water treatment, this learning objective focuses on explain why waste water must be treated before it is released into the environment. Within Using the Earth's resources and obtaining potable water, students should explain this idea in the exact curriculum context rather than as an isolated fact. Approved keywords for this objective include waste water. waste water means water that has been used and contains contaminants, requiring treatment before release into the environment. Avoid students often think that waste water can be released into the environment without treatment if it looks clean; instead emphasize that waste water must be treated to remove harmful substances and microbes before being released to protect the environment. For exam answers, always explain the environmental impacts of untreated waste water during your exam answers.