The Workplace Hazardous Materials Information System (WHMIS) is a Canada-wide system designed to give employers and workers information about hazardous materials used in the workplace.
Under WHMIS, there are three ways in which information on hazardous materials is to be provided:
labels on the containers of hazardous materials;
material safety data sheets to supplement the label with detailed hazard and precautionary information; and
worker education programs.
The supplier of the hazardous material provides the labels and material safety data sheets to the employer. The employer passes the information on to the worker and provides education programs.
In Ontario, both the federal and provincial WHMIS legislation is enforced by provincial Ministry of Labour inspectors, except in federal government workplaces, where Human Resources Development Canada, Labour Program inspectors enforce the legislation.