Which is a recommended best management practice for preventing contamination of surface and groundwater by pesticides?

Using terrace and conservation tillage practices is a recommended best management practice for preventing contamination of surface and groundwater by pesticides. These methods help to reduce soil erosion and runoff, which can carry pesticides into nearby water bodies. Terracing involves reshaping land into steps that follow the contour of the landscape, which slows down water movement and allows for better absorption into the soil. Conservation tillage minimizes soil disturbance, helping to maintain soil structure and enhance the presence of protective vegetation that can filter pollutants.

In contrast, selecting persistent pesticides can increase the likelihood of contamination since these chemicals remain in the environment for extended periods, potentially leaching into water sources. Cleaning sprayers near sinkholes poses a risk, as contaminants can directly enter groundwater supply without any filtration. Finally, using highly water-soluble pesticides is counterproductive, as these substances are more likely to leach through the soil and contaminate groundwater. Therefore, employing terrace and conservation tillage practices is critical in mitigating the risk of pesticide contamination in water systems.