WHMIS training has two mandatory parts. Updated for 2026 with December 2022 amendment changes, employer obligations, and what contractors need to know.
Last updated: March 2026
Your crew is on site. A new sub just showed up with a truck full of solvents, adhesives, and concrete sealants. Someone asks where the Safety Data Sheets are. Nobody knows. And the worker spraying the product? He finished a generic WHMIS course three years ago but has never been trained on a single product he is using today.
That is not a training gap. That is a ticking fine. In Alberta alone, OHS penalties for failing to train workers on hazardous products can reach hundreds of thousands of dollars. Federally, non-compliance with the Hazardous Products Act can trigger fines up to $5 million. More importantly, your crew is exposed to real health risks every shift without the right knowledge.
At Safety Evolution, we help hundreds of contractors build WHMIS programs that actually hold up on site, not just in a binder. Here is what you need to know to get your training right.
WHMIS (Workplace Hazardous Materials Information System) is Canada's mandatory national system for classifying hazardous products and communicating hazard information to workers through labels, Safety Data Sheets (SDSs), and training. It is a legal requirement in every province and territory, enforced through occupational health and safety legislation.
For construction, this matters more than most contractors realize. Your average job site does not look like a chemistry lab, but the hazardous product exposure is constant. Think about what your crew touches daily: concrete sealants, epoxy adhesives, spray foam, paint thinners, silica-generating materials, fuel, propane, and cleaning solvents. Every one of those products falls under WHMIS.
If your workers cannot read a WHMIS label, do not understand the pictograms on a container, or have never seen the Safety Data Sheet for the product they are spraying, you have a compliance problem and a safety problem at the same time.
Safety Evolution's training courses include WHMIS education that covers both generic and workplace-specific components, with instant certificates and expiry tracking built in.
Most contractors think running their crew through an online WHMIS course covers them. They are wrong. That is only half the requirement.
WHMIS training has two mandatory components, and both are required by law in every Canadian jurisdiction:
This is the "portable" part. It covers the universal WHMIS system itself and applies regardless of workplace:
This part can be delivered through online courses, in-person classes, or a combination. It is the same for every workplace.
This is where most contractors fall short. Workplace-specific training must cover the actual hazardous products on your site and the specific procedures your crew needs to follow:
An online WHMIS certificate does not replace workplace-specific training. It never has. Your employer still needs to walk your crew through every hazardous product they might encounter and make sure they know the procedures. According to the Canadian Centre for Occupational Health and Safety (CCOHS), the employer is responsible for providing both components.
The short answer: anyone who works with or could be exposed to a hazardous product. On a construction site, that is almost everyone.
WHMIS training must be provided to all workers who:
Notice that list includes supervisors and managers, not just the crew doing the hands-on work. If you are a site supervisor on a project where hazardous products are present (which is virtually every construction project), you need WHMIS training too.
For GCs managing multiple subs, here is the blunt truth: you cannot just assume your subcontractors have trained their people. If their crew is working on your site with hazardous products and something goes wrong, the GC's safety program is also under scrutiny. Many GCs now require proof of WHMIS training as part of their construction safety orientation before a sub steps on site.
If your training materials still reference "WHMIS 2015," it is time to update. The system has changed, and the transition period is over.
In December 2022, Health Canada amended the Hazardous Products Regulations (HPR) to align with Revisions 7 and 8 of the Globally Harmonized System of Classification and Labelling of Chemicals (GHS). Suppliers were given a three-year transition period to comply. That period ended on December 14, 2025. All product labels and SDSs should now reflect the updated requirements.
Here is what changed and why it matters for your training program:
This is a brand-new physical hazard class covering gases or liquids packaged under pressure that do not meet the definitions for compressed, liquefied, or dissolved gases. Products in this class use both the flame and gas cylinder pictograms (for Categories 1 and 2) or just the gas cylinder pictogram (for Category 3). Your crew needs to recognize this new classification on labels and SDSs.
The old "Flammable Aerosols" hazard class is now simply called "Aerosols." A new Category 3 was added for non-flammable aerosol products. Category 3 aerosols do not require a pictogram but still carry a signal word and hazard statement. This means some aerosol products your crew uses may now appear in the WHMIS system for the first time, even if they are not flammable.
Flammable gases are now divided into Category 1A and Category 1B. Category 1A includes pyrophoric gases and chemically unstable gases. "Pyrophoric Gases" is no longer a separate hazard class; it has been folded into Flammable Gases Category 1A. If your crew works with welding gases, propane, or other flammable gases on site, your training materials need to reflect these updated categories.
Section 9 of the SDS (Physical and Chemical Properties) now includes additional required data points. There is also a new option for suppliers to include combustible dust hazard information. If your workers rely on Section 9 when assessing physical hazards, they need to know what the new data points mean.
The amendments also updated classification criteria for water-activated toxicants and Reproductive Toxicity Category 2. While these are more technical, they affect how certain products are classified and labelled. The bottom line: if your training content was built before 2023, it is outdated.
The system is no longer called "WHMIS 2015." It is simply "WHMIS." If your training program still teaches the old content without the 2022 updates, your workers may not recognize new hazard classes or updated label information on products arriving at site.
There are 10 pictograms used under WHMIS, each representing a different type of hazard. Nine use the red diamond GHS border, while the tenth is the Canada-specific biohazardous infectious materials symbol. Your crew needs to recognize all of them on sight.
The legislation is clear: the employer carries the primary responsibility for WHMIS. This is not optional, and it is not something you can hand off entirely to a third-party training provider.
Every employer must:
Here is one that catches contractors off guard: if you import a hazardous product from outside Canada and the supplier has not provided WHMIS-compliant labels and SDSs, you become the responsible party. The importer takes on the supplier's obligations under the Hazardous Products Act. For specialty construction products ordered from US suppliers, this matters.
This is the question every contractor asks, and the answer frustrates most of them: there is no legislated expiry date for WHMIS certification in Canada.
No province or territory sets a specific renewal frequency in the regulations. But that does not mean "train once and forget it." The legislation requires employers to review their WHMIS program at least annually and retrain workers under specific conditions.
Retraining is required when:
Industry best practice: Most safety professionals recommend a full WHMIS refresher every 1 to 3 years, with annual reviews being the gold standard. For construction, where your crew moves between sites and product inventories change constantly, an annual refresher combined with site-specific orientations for each new project is the standard that holds up during an audit. Not sure if your current program meets that standard? Book a free safety assessment and we will tell you where you stand.
Many GCs now require annual WHMIS refreshers as part of their safety prequalification requirements. If you are a sub bidding on work, check the GC's requirements. Expired or outdated WHMIS records can cost you a bid before the conversation even starts.
We helped a 20-person mechanical contractor in Red Deer get their WHMIS house in order last year. They had generic certificates from 2019 and zero workplace-specific documentation. Their foreman had been handling isocyanate-based sealant for months with no product-specific training, no fit-tested respirator, and no idea the product required a supplied-air system in confined spaces. Nobody was trying to cut corners. They just did not know what they did not know. That is the gap workplace-specific training is designed to close.
Construction presents unique WHMIS challenges that office-based programs do not address. Here is what makes it harder:
Rotating sites and products. Your crew does not work in one building with a fixed chemical inventory. They move between job sites where the products change. A framing crew might go from a residential project using standard adhesives to a commercial site with industrial-grade sealants, spray coatings, and concrete admixtures. Each new site needs its own workplace-specific training component.
Multiple trades, multiple chemical inventories. On any given day, there could be painters, plumbers, electricians, and concrete finishers on site, each with their own hazardous products. As a GC, you need to know what is coming onto your site and make sure your site orientation covers the shared exposure risks.
Field conditions. Products get decanted into smaller containers. Labels get damaged by weather. SDSs are sitting in a binder in the trailer while the crew is working 200 metres away. These real-world conditions are exactly what workplace-specific training needs to address: where to find the SDS, what to do when a label is unreadable, and how to properly label a transfer container.
Construction workers are exposed to hazardous products constantly: silica dust from cutting concrete, solvents in paints and coatings, isocyanates in spray foam, lead in older structures, and respirable crystalline silica across nearly every demolition and concrete operation. WHMIS training is not a box to check. It is how your crew knows what they are breathing, touching, and working with every day.
A compliant WHMIS program is not just a certificate in a file. Here is what a solid program looks like for a construction contractor:
WHMIS is a national system, but each province enforces it through their own OHS legislation. The core requirements are the same everywhere, but there are differences worth knowing:
Regardless of province, the fundamentals do not change: provide both components of training, keep SDSs current and accessible, maintain labels, and document your program. If you operate across multiple provinces, your WHMIS program needs to meet the requirements in every jurisdiction where you have workers.
WHMIS is built on three foundational worker rights:
If a worker has not been trained on a hazardous product and is asked to use it, they have the legal right to refuse. For a contractor who needs that crew working, a work refusal stops production and triggers an investigation. Proper training prevents that scenario entirely.
At Safety Evolution, we work with construction contractors across Canada to build WHMIS programs that hold up during audits and keep your crew safe on site. If you are not sure where to start, or if your current program would survive an inspector's visit, book a free safety assessment and let us take a look.
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Get Your Free Assessment →No Canadian province or territory sets a specific expiry date for WHMIS certification. However, employers are required to review their WHMIS program at least annually and retrain workers whenever new hazardous products are introduced, work conditions change, or new hazard information becomes available. Best practice is to provide a full refresher every 1 to 3 years, with annual refreshers recommended for construction workers who move between sites frequently.
The employer is legally responsible for providing and funding WHMIS training in every Canadian jurisdiction. Training must be delivered during paid work hours at no cost to the worker. This includes both the generic WHMIS education component and the workplace-specific training component.
No. An online WHMIS certificate only covers the generic education component: hazard classes, labels, pictograms, and SDSs. Employers are still required to provide workplace-specific training covering the actual hazardous products on site, safe handling procedures, PPE requirements, and emergency response. Both components are mandatory for compliance.
Health Canada amended the Hazardous Products Regulations in December 2022 to align with GHS Revisions 7 and 8. Key changes include a new "Chemicals Under Pressure" hazard class, renaming "Flammable Aerosols" to "Aerosols" with a new Category 3 for non-flammable aerosols, subcategorizing Flammable Gases into 1A and 1B, updated SDS Section 9 requirements, and revised criteria for water-activated toxicants. The three-year transition period ended December 14, 2025. All suppliers, importers, and employers must now comply with the updated requirements.
Common hazardous products on construction sites include concrete sealants, epoxy adhesives, spray foam (isocyanates), paint and paint thinners, cleaning solvents, propane, fuel, silica-containing materials, welding consumables, and waterproofing products. Any product that has a Safety Data Sheet (SDS) and is classified as a hazardous product under WHMIS requires worker training before use. With the 2022 amendments, some products (like non-flammable aerosols) may now be classified under WHMIS for the first time.
There are 10 WHMIS pictograms in total. Nine use the red diamond-shaped GHS border (flame, flame over circle, gas cylinder, corrosion, exploding bomb, skull and crossbones, health hazard, exclamation mark, and environment). The tenth is the biohazardous infectious materials symbol, which is unique to Canada and uses a round black border. The environment pictogram is not mandatory under WHMIS but may appear on labels voluntarily. For a detailed breakdown of each pictogram, see our complete guide to WHMIS pictograms.
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