What are the four categories of contaminants in water?

The four categories of contaminants in water consist of physical, chemical, biological, and radiological contaminants.

Physical contaminants refer to particles and materials that can affect water quality and clarity, such as sediment, silt, and debris. These can interfere with the aesthetic qualities of water and may also necessitate additional treatment processes.

Chemical contaminants encompass a wide range of pollutants that include pesticides, heavy metals, and nutrients like nitrates and phosphates. These substances can pose health risks and can come from various sources including agricultural runoff and industrial discharges.

Biological contaminants are organisms that can cause disease or adversely affect water quality. This category includes bacteria, viruses, and protozoa, which can lead to waterborne illnesses if not adequately managed.

Radiological contaminants include radioactive substances that can be naturally occurring or man-made, posing risks to human health and the environment due to their radioactive properties.

Together, these categories provide a comprehensive framework for identifying and managing the different types of contaminants present in water systems, making option B the most accurate representation of the categories recognized in water quality management.