Georgia Pesticide Applicators Practice Exam 2026 – Complete Preparation Guide

Improperly managed pesticides can lead to contamination of water sources, which is a significant environmental concern. When pesticides are not applied according to regulations or best practices, they can leach into soil, runoff into waterways, or be improperly disposed of, resulting in harmful chemicals entering rivers, lakes, and groundwater. This contamination can harm aquatic ecosystems, pose risks to drinking water supplies, and disrupt the balance of organisms that rely on these water sources.

The other options, while relevant to agriculture and pest management, do not accurately reflect the adverse effects of mismanaged pesticides. Enhanced soil fertility and increased crop yield suggest positive outcomes that would not occur as a result of contamination. Similarly, a reduction in pests is often the intended objective of pesticide application, not a negative consequence. Therefore, contamination of water sources truly represents a critical and adverse effect of poor pesticide management practices.