WHMIS 2015 has 5 major hazard groupings:

WHMIS 2015, also known as the Workplace Hazardous Materials Information System, actually incorporates three major categories of hazards rather than five. These categories are:

1. Physical Hazards - This includes substances and materials that have physical risk or property dangers, such as flammable or explosive materials.

2. Health Hazards - These are materials that can cause health issues or bodily harm, including chemicals that are toxic or carcinogenic.

3. Environmental Hazards - This category includes substances that pose risks to the environment, like those harmful to aquatic life or that communicate ecological risks.

By distinguishing these specific groupings, WHMIS 2015 provides a clear framework for identifying and managing various hazardous materials in the workplace. The misunderstanding might stem from the perception that there are more groupings due to the various subcategories under the main headings; however, the foundational structure is built on the three outlined categories.