Nurseries are heavy users of pesticides. Irrigation or storm runoff from nurseries generally contains high levels of organic matter that serves as a carrier for hydrophobic pesticides such as pyrethroids. We continuously monitored runoff flow rates and pesticide levels at a 125-acre commercial nursery and evaluated the effectiveness of several BMPs for reducing the offsite movement of pyrethroids such as bifenthrin. This study experienced two relatively dry seasons. However, pesticide exports in storm runoff far exceeded pesticide runoff during dry months. Under dry weather conditions, improved irrigation practices, water retention and reuse, and the isolation of production areas were found to essentially eliminate pesticide runoff export. Sediment cleaning before the arrival of the rainy season was recommended as a highly inexpensive and feasible BMP for reducing pyrethroid loads in storm runoff.