In the United States, hazardous wastes generated by commercial

In the United States, hazardous wastes generated by commercial or industrial activities may be classified as "listed" hazardous wastes or "characteristic" hazardous wastes by the EPA.

In regulatory terms, a Resource Conservation and Recovery Act (RCRA) hazardous waste is a waste that is either a "characteristic waste" or a "listed waste":

* Characteristic Waste - exhibits at least one of the four "characteristics" of hazardous waste (ignitability, corrosivity, reactivity, or toxicity)

* Listed Waste - appears on one of the four hazardous wastes lists (F-list, K-list, P-list, or U-list)

Individual states may regulate particular wastes more stringently than mandated by federal regulation. This is because the U.S. EPA is authorized to delegate primary rule-making authorization to individual states. Most states take advantage of this authority, implementing their own hazardous waste programs that are at least as stringent as the federal program.

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