Safe Chemical Handling in Alberta: WHMIS Duties and Practical Controls

How WHMIS responsibilities are divided

WHMIS is a shared Canadian system with different responsibilities:

• Suppliers classify hazardous products and provide compliant supplier labels and safety data sheets under the federal Hazardous Products Act and Hazardous Products Regulations.
• Employers provide worker education and site-specific training, maintain required labels and safety data sheets, and establish workplace controls under the applicable provincial or territorial occupational health and safety law.
• Workers participate in training, follow controls, use required protective equipment and report missing information, damaged labels, spills and other hazards.

For Alberta workplaces, WHMIS requirements are set out primarily in Part 29 of the Occupational Health and Safety Code. Chemical exposure controls may also engage Part 4 and other parts of the Code.

Start with a current chemical inventory

Maintain an inventory that identifies:

• product name and supplier;
• work area and responsible department;
• current safety data sheet and revision date;
• maximum quantity and storage location;
• how the product is used or generated;
• workers and contractors who may be exposed;
• incompatible materials and special storage needs;
• required engineering controls, personal protective equipment and emergency equipment; and
• products that are obsolete, unidentified or awaiting disposal.

Review the inventory when a new product is proposed, a process changes, an SDS is updated or workers identify a concern. Unlabelled or unknown material should be isolated and assessed before use.

Assess the work, not only the product

The same product may create different risk depending on quantity, concentration, temperature, pressure, ventilation, method of application and duration of exposure. Spraying, heating, grinding, mixing or entering a poorly ventilated area may change the exposure significantly.

The assessment should consider:

• inhalation, skin, eye and ingestion routes;
• acute and chronic health effects;
• fire, explosion and reactivity;
• normal work and non-routine tasks such as maintenance and spill cleanup;
• foreseeable spills, leaks, line breaks and container failure;
• simultaneous work and contractor activities;
• workers who may be more susceptible or require accommodation; and
• whether occupational hygiene monitoring or other professional assessment is needed.

Where exposure limits, complex mixtures or uncertain controls are involved, obtain advice from a qualified occupational hygienist or other appropriate professional.

Use the hierarchy of controls

Eliminate or substitute

Ask whether the hazardous product or process is necessary. Consider a less hazardous product, lower concentration, smaller quantity or different application method. Verify that substitution does not introduce a new hazard or affect product performance.

Engineering controls

Use enclosed transfer, local exhaust ventilation, barriers, automated dispensing or other controls that reduce exposure at the source. Ventilation must be designed, used and maintained for the actual contaminant and process. General building ventilation may not be sufficient.

Administrative controls

Procedures, restricted access, scheduling, housekeeping and supervision support higher-order controls. They should identify the task sequence, prohibited actions, stop-work conditions, spill response and escalation path.

Personal protective equipment

PPE is the final line of defence and must be selected from the hazard assessment, exposure information, SDS, manufacturer instructions and Alberta requirements. Confirm chemical compatibility, breakthrough time, fit, limitations, inspection, cleaning and replacement.

Respirator use requires more than selecting a cartridge from an SDS. Employers must meet the applicable respiratory-protection requirements, including fit testing, user training, equipment maintenance and assessment of whether the atmosphere is suitable for the respirator selected.

Labels and workplace containers

Alberta OHS Code s. 398 and the related Part 29 provisions address labels. Supplier labels must remain legible. Workplace labels are required in the circumstances set out by the Code, including many situations where a hazardous product is transferred to another container or produced in the workplace.

Do not use food or beverage containers for chemicals. Label secondary containers promptly and identify pipes, process vessels or transfer systems using a method workers understand and that meets the applicable requirements.

Safety data sheets

Sections 404–407 address safety data sheet requirements in Alberta. Employers should ensure current SDSs are readily available to workers and to the joint health and safety committee or health and safety representative where applicable.

Check the product identifier, recommended use, hazard classification, exposure controls, reactivity, first aid, fire response and spill information. If the SDS does not reflect the product or use, contact the supplier and do not guess at safety-critical information.

Education, training and competency

Section 397 requires worker education and training and requires workplace procedures relating to labels, safety data sheets, storage, use, handling, manufacture, fugitive emissions and emergencies. These procedures must be developed in consultation with the joint health and safety committee or health and safety representative, if applicable.

Training should cover:

• the WHMIS system and label/SDS information;
• products and hazards present in the worker’s area;
• site-specific storage, transfer, use and disposal procedures;
• engineering controls and their limitations;
• PPE selection, use, inspection and replacement;
• spill, exposure, fire and first-aid actions;
• how to report missing information or a failed control; and
• the worker’s right and responsibility to stop and seek direction when conditions are unsafe.

Verify understanding through practical demonstration and observation. A signed attendance sheet confirms participation, not competency.

Storage and incompatibility

Store chemicals by compatibility and hazard, not simply in alphabetical order. Control ignition sources, temperature, sunlight, moisture and unauthorized access as required. Use suitable cabinets, racks, trays and secondary containment.

Keep incompatible materials separated. The required separation depends on the product, quantity and storage system; use the SDS, fire code requirements, manufacturer information and qualified advice. Do not publish universal separation distances without verifying the governing code and facility conditions.

Spill and exposure response

Before work begins, workers should know:

1. when to stop work and evacuate;
2. who may respond and what training is required;
3. how to raise the alarm and contact emergency services;
4. where eyewash, shower, spill-control and fire equipment are located;
5. which PPE and absorbents are compatible with the product;
6. how contaminated materials will be contained and disposed of; and
7. how the event will be reported, investigated and reviewed.

Do not direct an untrained worker to clean an unknown or uncontrolled release. Emergency response must be proportionate to the product, quantity, location and potential consequences.

Contractors and changing conditions

Contractors may bring products or perform work that changes exposure for others. Coordinate inventories, SDS access, ventilation, permits, emergency arrangements and waste handling before work starts.

Reassess controls when a product, supplier, process, ventilation system, work area, quantity or workforce changes. Review concerns raised by workers and investigate symptoms or exposure indicators promptly.

Records that support implementation

• current chemical inventory and SDS register;
• hazard and exposure assessments;
• substitution decisions and engineering-control specifications;
• ventilation inspection, maintenance and performance records;
• training and competency assessments;
• PPE and respirator records required by the applicable program;
• spill, exposure, first-aid and incident records; and
• corrective actions with effectiveness verification.

Official sources

• Alberta Occupational Health and Safety Code, Part 29 — WHMIS, including ss. 395, 397, 398 and 404–407.
• Alberta Occupational Health and Safety Code, Part 4 — Chemical Hazards, Biological Hazards and Harmful Substances.
• Health Canada: Roles and responsibilities under WHMIS.

Source verification date: November 6, 2026. This draft replaces United States OSHA framing with Alberta and federal Canadian sources. It requires CRSP review and product-specific verification before publication.

John Duplessis, B.Sc., CRSP

Canadian Registered Safety Professional

This draft remains subject to the author’s professional review and approval before publication.