Since the mid 1980s, it has been recognized that significant quantities of unwanted pesticides are being retained by agricultural producers in barns and other out buildings throughout the United States. State governments have responded to the hazards posed by these pesticides by implementing programs to collect and dispose of them. This paper reviews issues related to costs and funding of pesticide collection and disposal programs. Primary and secondary information on states' approaches to and experiences with unwanted pesticide removal is presented. Differences in the theoretical impacts of various collection funding methods on reducing unwanted pesticide stocks and allocating disposal costs are discussed.