The Wyoming Department of Environmental Quality, Water Quality Division (DEQ/WQD) administers the NPDES program within the boundaries of the state (WYPDES program) except for on the Wind River Indian Reservation. This general permit was established to meet the court ordered mandate for pesticide applications to “waters of the U.S.” in Wyoming.
This general permit for major pesticide applications applies to pesticide applications that exceed the size thresholds established for the various pesticide use categories. This permit does not apply to pesticide applications on waters impaired for a specific pesticide or its degradates, however, the permit may be used for the application of other types of pesticides with different degradates than those listed in the impairment. The effluent limits established in this permit are based upon Chapters 1, 2, and 4 of the Wyoming Water Quality Rules and Regulations.