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What is the effect of polluted water entering a river on drinking water use?

Answer and explanation

Correct answer: Need for treatment increases

Polluted water entering a river can contain harmful substances, disease-causing organisms, excess nutrients, or other unwanted materials. Such water may no longer be safe for direct drinking. Before it is supplied for human consumption, it generally needs suitable treatment, such as removing suspended matter, reducing harmful organisms, and checking its quality. The exact treatment depends on the type and amount of pollution. Pollution can therefore increase the cost, effort, and importance of water purification, even though treatment may make some water usable again.

Option A is correct because contamination increases the need for treatment before river water can be used as drinking water. The other choices do not follow from pollution. Polluted water does not automatically become safer, a river does not immediately dry up, and silt does not completely disappear. The answer also does not claim that treatment always removes every contaminant; it states the practical consequence that more purification is required. Safe drinking-water use depends on testing, proper treatment, and protection of the source.

Related tags

DrainageRiversDrinking-Water

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