Which of the following is NOT one of the three water quality requirements?

Temperature control is not one of the three primary water quality requirements. The three main water quality requirements generally focus on factors that directly affect the health and safety of water sources, such as nutrients, aesthetics, and risks to human health.

Nutrients are important because they influence the growth of aquatic life, and excessive nutrients can lead to issues like algal blooms, which can harm both ecosystems and human health. Aesthetics refer to the visual and sensory qualities of water, which can affect its acceptance for consumption, recreation, and other uses. Risk to human health is a critical factor, as water must be safe for consumption and free from pathogens and contaminants.

While temperature can influence various biological and chemical processes in water, it is not typically categorized as a fundamental requirement for water quality in the same way that the other three factors are. Temperature control may be relevant in specific contexts, such as in certain industrial processes or for certain aquatic species, but it does not fall into the core categories of water quality that primarily concern public health and ecological integrity.