Which property of a pesticide increases its likelihood of moving in surface water runoff?

The property of a pesticide that increases its likelihood of moving in surface water runoff is high solubility. When a pesticide is highly soluble, it can easily dissolve in water and be transported during rainfall or irrigation events. This solubility allows the pesticide to enter the water system through runoff, potentially leading to contamination of surface water bodies like rivers, lakes, and streams.

Pesticides with low volatility tend to remain in the soil and do not easily evaporate into the air, reducing their chances of being carried away by water. High toxicity refers to the harmful effects of a pesticide on living organisms, but it does not directly relate to its movement in water. High persistence indicates that the pesticide remains in the environment for an extended period, which may affect its long-term impact, but does not necessarily enhance the immediate likelihood of runoff. Therefore, high solubility is the critical factor that directly influences a pesticide's potential to move with surface water runoff.