The State of California has recently developed a computer automated system to help generators, the regulated community, and the various regulatory agencies accurately determine the proper classification of potentially hazardous waste which may be subject to regulation under California and federal law. Properly classifying a waste as hazardous or non-hazardous requires a complete understanding of the hazardous waste criteria contained in California law, and is the first critical step of hazardous waste management. California has long been considered to be the state with the most stringent environmental laws and standards applicable to waste classification. Some of the highest volume hazardous waste streams regulated in California are either exempt or are not classified as hazardous waste under the Resource Conservation and Recovery Act (RCRA). The California Deparmtent of Toxic Substances Control, Office of Scientific Affairs has developed a user-friendly, computer automated system, known as WasteCat(trademark) to accommodate the need for timely and accurate waste classification and analysis. WasteCat is a Windows-driven program which asks the user a series of directed questions relative to the waste. After answering all of the questions, WasteCat presents the user with a printout describing the hazardous characteristics of the waste along with a classification determination for the waste in question.