The Hazard Classes

The generator must label and mark each container of hazardous waste, as outlined in 49 CFR 172.44. The labeling requirements for hazardous waste packages are complex. In general, all packages must display a diamond-shaped hazardous-materials label that identifies the hazard class of the hazardous waste material.

The hazard classes are as follows:

• Class 1: Explosives
• Class 2: Gases
• Class 3: Flammable Liquids
• Class 4: Flammable Solids, Spontaneously Combustible Materials, and Dangerous When Wet Materials
• Class 5: Oxidizers and Organic Peroxides
• Class 6: Poisonous Materials and Infectious Substances
• Class 7: Radioactive Materials
• Class 8: Corrosives
• Class 9: Miscellaneous Hazardous Materials and General Danger

The label must also include the identification number of the hazardous waste, which is the number of its hazard class. Some of the identification numbers include a decimal to indicate additional details about the type of waste and its characteristics.

To learn more about RCRA safety standards visit our RCRA Refresher Online Training web page.