The main objective to be achieved in water treatment is

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The main aim of water treatment is to make the water safe for use by removing substances that could harm health. Focusing on reducing foreign substances captures the breadth of what needs to be removed—biological contaminants like microbes, dissolved chemicals and toxins, and physical materials such as sediments. Treatment trains—coagulation, filtration, disinfection, and sometimes advanced processes—are designed to lower these substances to levels set by health standards, ensuring the water is fit for drinking and other uses.

While providing water that is safe and sanitary is the overall outcome, reducing foreign substances describes the concrete action taken during treatment to achieve that outcome. Increasing water pressure is a distribution concern, and turbidity is just one quality parameter; water can be clear yet still contain harmful contaminants if foreign substances aren’t adequately removed.