Which of the following is an example of a nonpoint source of pollution?

• A. Runoff from agricultural fields
• B. Leak from an underground storage tank
• C. Effluent from a factory pipe
• D. Discharge from a sewage treatment plant

Answer: (A)

Verified step by step guidance

1. Understand the concept of nonpoint source pollution: Nonpoint source pollution refers to pollution that does not originate from a single, identifiable source. Instead, it comes from multiple, diffuse sources, often carried by runoff from rain or snowmelt.
2. Compare nonpoint source pollution with point source pollution: Point source pollution originates from a specific, identifiable location, such as a pipe, tank, or facility. Examples include effluent from a factory pipe or discharge from a sewage treatment plant.
3. Analyze the options provided: Evaluate each option to determine whether it represents a point source or nonpoint source of pollution. For example, runoff from agricultural fields is diffuse and widespread, making it a nonpoint source, while leaks from underground storage tanks and effluent from factory pipes are specific and identifiable, making them point sources.
4. Focus on the characteristics of agricultural runoff: Agricultural runoff typically includes fertilizers, pesticides, and sediments that are carried by rainwater or irrigation into nearby water bodies. This type of pollution is diffuse and cannot be traced to a single point, fitting the definition of nonpoint source pollution.
5. Conclude that the correct answer is 'Runoff from agricultural fields,' as it aligns with the definition of nonpoint source pollution, while the other options represent point sources of pollution.