What situation can lead to contamination of water supplies during pesticide application?

High water tables can lead to contamination of water supplies during pesticide application because they indicate that the groundwater is close to the surface. When pesticide is applied, particularly in areas with high moisture levels in the soil, there is a greater risk that the chemicals can leach into the groundwater or be carried away by surface runoff during rain events. This can result in pesticides entering water sources more easily than in areas where lower water tables exist.

In contrast, low water tables typically denote that the ground is drier, reducing the risk of contaminants reaching the water supply and allowing for more effective absorption of pesticides without immediate runoff potential. Other factors like incorrect dosage, while crucial for effective pest control and safety, do not inherently increase the risk of water contamination in the same direct manner as high water tables do. Similarly, the use of multiple applicators does not directly correlate with water supply contamination; it depends more on the handling and application practices rather than just the number of applicators involved.