Which of the following defines hazardous waste (HAZWASTE)?

Hazardous waste (HAZWASTE) refers specifically to materials that are considered hazardous due to their characteristics and potential risks to human health and the environment. The correct choice accurately describes HAZWASTE as being HAZMAT that has already been used or discarded. This designation is critical because these materials can pose significant threats if not managed properly, as they may be toxic, reactive, flammable, or corrosive.

The emphasis on HAZMAT being used or discarded is what differentiates it from materials that are simply deemed safe or non-toxic. Understanding this distinction is essential in recognizing the proper protocols and regulations surrounding the management of hazardous waste to ensure compliance with environmental laws and safety standards.