The WYPDES general permit for Pesticide Application was established to meet a federal court-ordered mandate to regulate pesticide and herbicide applications to “waters of the U.S.” in Wyoming.  Operators desiring to apply pesticides or herbicides to or near Wyoming surface waters are required to obtain coverage under one of the pesticide application general permits prior to pesticide or herbicide application activities.  Typical activities covered under this general permit include mosquito control, nuisance plant control, and invasive species control (such as zebra mussel control) For further information, visit the ‘General Permits’ tab on the right.