A pesticide with a low GUS will have what potential to move toward groundwater?

A pesticide with a low GUS (Groundwater Ubiquity Score) indicates that it has a low potential to move toward groundwater. The GUS score is a predictive value that takes into account the pesticide's half-life, its adsorption coefficient (Koc), and its water solubility. When a pesticide has a low GUS score, it generally suggests one or more of the following: it decomposes relatively quickly in the environment, it does not dissolve well in water, or it binds strongly to soil particles, making it less likely to leach into groundwater.

In practical terms, this means that such pesticides are less mobile in the soil and are more likely to remain within the upper layers of the soil profile, reducing the risk of contamination to groundwater sources. This characteristic is particularly important for ensuring water safety and protecting aquifer systems from pesticide pollution.