Water quality is a critical environmental, social, and political issue in Delaware. In the late 1990s, a series of events related to water quality issues led to the passage of a state nutrient management law. This new law required nutrient management planning and established a state certification program for nutrient users in the agricultural and nonagricultural sectors. Extension Nutrient Management Specialists from University of Delaware Cooperative Extension had a lead role in the development and delivery of this program. The law requires affected individuals to attend between 6 and 12 credits (hours) of nutrient management certification classes. Classes focus on the specific requirements of the law, the relationship between nutrients and water quality, and best management practices for storing and applying nutrients. Since January 2001 more than 2300 individuals have attended certification classes. These classes have generally been very well received, which has helped to defuse the anxiety and animosity that characterized many early discussions with stakeholders and has set the stage for an effective program that can address important environmental issues in the state. (Contains 1 table and 2 figures.)