Which of the following statements best describes the EPA priority pollutant list as given?

• A. A broad list, including pollutants such as sulfur dioxide, carbon monoxide, ozone, nitrogen dioxide, particulate matter, and lead.
• B. Chlorofluorocarbons and pesticides form the core of the list.
• C. Only heavy metals are included.
• D. The list is limited to waterborne pathogens.

Answer: (C)

The EPA priority pollutant list is a defined set of substances identified under the Clean Water Act as requiring regulation and monitoring due to their toxicity to aquatic life and humans. It is broad, including heavy metals (like lead, mercury, cadmium, arsenic, chromium) as well as many organic chemicals, pesticides, solvents, and other toxic substances. It is not limited to heavy metals, nor is it about air pollutants or waterborne pathogens. The statements suggesting it is restricted to heavy metals (or to other narrow categories) don’t capture its wide scope.