What is a common reason for setting secondary standards in water quality?

Setting secondary standards in water quality is commonly associated with improving the aesthetic quality of water. These standards are typically not enforced by law but serve as guidelines to address non-health-related concerns. Issues like taste, odor, color, and turbidity fall under this category, which can affect the public's perception and acceptance of water sources.

For example, even if water is safe to drink, unpleasant taste or smell may deter individuals from using tap water. By focusing on aesthetic qualities, secondary standards help ensure that water is pleasant and attractive for consumption and use, encouraging more widespread use of public water systems.

While health hazards and toxic substances are critical considerations in water quality management, they are typically addressed under primary standards, which have more stringent regulations aimed at protecting public health. Biodiversity, while important for overall ecosystem health, is more of a long-term environmental goal than a specific reason for establishing secondary standards focused on immediate water quality concerns.