What are primary sources of water contamination during aquatic pest control efforts?

Primary sources of water contamination during aquatic pest control efforts involve activities directly related to the application and management of chemicals used in pest control. Runoff occurs when rain or irrigation water flows over treated areas, picking up chemical residues and carrying them into nearby water bodies. Overspray refers to the unintentional dispersion of pesticides into water sources during application, which can happen due to wind or miscalibration of application equipment. Improper disposal of chemicals, such as pouring leftover pesticides into drains or water bodies, directly introduces harmful substances into aquatic ecosystems.

These actions contribute significantly to water pollution, making option B the most accurate choice regarding contamination sources in the context of aquatic pest control. Other options, while relevant to environmental concerns, do not specifically address the primary interactions between pest control measures and water contamination.