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WHMIS is enforced by a combination of federal and provincial legislation. Federal legislation requires suppliers/importers of hazardous materials (controlled products) to provide adequate labels and MSDSs as a condition of sale and importation.
Federal, provincial, and territorial Occupational Safety and Health (OSH) legislation requires employers to provide labels, MSDSs, and worker education programs in the workplace.
The federal Hazardous Products Act and the pursuant Controlled Products Regulation, which apply to suppliers, define which materials (i.e., controlled products) are included in the Workplace Hazardous Materials Information System (WHMIS) and what information suppliers must provide to employers for controlled products used in the workplace.
Reference Manual for the WHMIS Requirements of the Hazardous Products Act and Controlled Products Regulations
Source: Environmental & Workplace Health - Health Canada
Part 5 Chemical Agents and Biological Agents
5.3 - 5.19 Workplace Hazardous Materials Information System (WHMIS)