Which type of hazardous waste must be characterized as hazardous before disposal?

Characterizing hazardous waste is an essential process that ensures any waste generated is appropriately identified and managed according to environmental regulations. This is crucial for the protection of human health and the environment.

All types of hazardous waste—whether solid, liquid, or gas—must be characterized to determine if they meet the criteria for hazardous waste defined by regulations such as the Resource Conservation and Recovery Act (RCRA) in the United States. This characterization involves testing and analysis to evaluate the waste's physical and chemical properties.

Different waste types can contain hazardous components that can cause harm upon disposal, so it is vital to assess every type of hazardous waste before disposal. Without proper characterization, there is a risk of mishandling waste, which can lead to environmental contamination and legal penalties.

The requirement to characterize hazardous waste ensures that waste management practices are safe and compliant with relevant regulations, ultimately fostering responsible disposal and protecting public health and safety.