Hazardous Material Waste Classification & Labelling Requirements: A Guide for Business & Industry

This blog entry addresses common questions about proper classification & labelling of hazardous waste per TDG, CEPA, and WHMIS. Q&As include:

1. How are hazardous wastes federally classified?
2. How are hazardous wastes classified for transport under Transportation of Dangerous Goods (TDG) Regulations?
3. How are hazardous wastes classified for import & export under “Classification under CEPA and the EIHWHRMR?”
4. How are hazardous wastes classified per the WHMIS?
5. How are hazardous wastes classified per the WHMIS relative to transportation?
6. How are hazardous wastes classified per WHMIS relative to human health?
7. How do Canadian regulations differ from that of the U.S.?
8. What are specific hazmat labelling requirements per TDG regulations?
9. What are hazmat labelling requirements per CEPA and EIHWHRMR?
10. What are hazmat labelling requirements per WHMIS?
11. What are the key differences among TDG, CEPA, and WHMIS requirements for hazmat labelling?
12. How should you manage hazmat that falls under multiple CEPA waste categories during transport?
13. How can businesses ensure compliance given the complications of a three-tiered regulatory structure?
14. Given the complexity of federal regulations, how should businesses handle classification & labelling uncertainties?
15. Where can you get comprehensive guidance about federal hazmat classification and labelling requirements?

1. How are hazardous waste federally classified?

This is complicated (surprise!). There are three systems with redundant aspects:

• A federal classification system of rules used for transporting hazmat within the country, which is primarily based on Transportation of Dangerous Goods (TDG) Regulations. (See Q.2)
• It operates parallel to something called “Classification under CEPA and the EIHWHRMR,” which concerns itself with the importing & exporting of hazardous materials. (See source.) (See Q.3)

2. How are hazardous wastes classified for transport under Transportation of Dangerous Goods (TDG) Regulations?

TDG regulations organize wastes into nine classes for transportation. These are:

• Class 1. Explosives
• Class 2. Gases
• Class 3. Flammable liquids
• Class 4. Flammable solids
• Class 5. Oxidizing substances and organic peroxides
• Class 6. Toxic and infectious substances
• Class 7. Radioactive materials (also regulated by the CNSC)
• Class 8. Corrosives
• Class 9. Miscellaneous hazmat that doesn’t fit into 1-thru-8

3. How are hazardous wastes classified for import & export under “Classification under CEPA and the EIHWHRMR?

First, you need to know that EIHWHRMR is only enunciable as an acronym in conversational Klingon. Contrarily, in Ottawa, it’s merely a ridiculously long, totally useless initialism ostensibly helpful for remembering, “Export and Import of Hazardous Waste and Hazardous Recyclable Material Regulations.”

Under EIHWHRMR, there are five categories of hazardous wastes categorized by their intrinsic bad-boy characteristics. These are:

• Characteristic wastes. These are considered hazmat if they exhibit one or more of the following characteristics.
  • Ignitability—it catches fire under certain conditions. E.g., some paints, degreasers, or solvents.
  • Corrosiveness—it’s a significant acid or base. E.g., rust removers, certain cleaning fluids, or battery acid.
  • Reactivity—it’s prone to explode or release toxic fumes if heated, mixed with water, or pressurized. E.g., certain cyanides or sulphide-bearing wastes.
  • Toxicity—it’s harmful or fatal if ingested or absorbed, or it can leach toxic chemicals into the soil or ground water when disposed of on land. E.g., wastes containing cadmium, lead, or mercury.
• Listed wastes. Although we don’t do it with the same gleeful abandonment as our Yankee brethren, we also arbitrarily “list” some chemicals, oils, pharmaceuticals, and e-waste as hazmat (rather than considering their “characteristics”).
• Leachates. These are contaminated liquids formed when rainwater percolates through soil, extracting dissolved or suspended pollutants such as heavy metals or toxic compounds.
• Commercial chemical products. Pure or unused products are listed as hazardous when discarded.
• Internationally designated waste. These are wastes necessarily designated as hazardous to comply with international obligations, such as the Basel Convention.

4. How are hazardous wastes classified per the WHMIS?

This depends upon whether you’re talking about hazmat relative to its transportation or hazmat relative to human health. (See Q.5 and Q.6)

5. How are hazardous wastes classified per the WHMIS relative to transportation?

Relative to transportation, hazardous waste falls into two major groups under CPA: Health Hazards and Physical Hazards. Under each of these groups exist classes.

• Health hazard categories relative to transport. These are groupings specifically related to the Cross-border Movement of Hazardous Waste and Hazardous Recyclable Material Regulations for wastes that are toxic, flammable, corrosive, explosive, or otherwise hostile to the environment. The code for each group is:
  • HAZ1: Biomedical waste
  • HAZ2: Used oil
  • HAZ3: Polychlorinated biphenyls (PCBs)
  • HAZ4: Material with characteristics of dangerous goods under TDGR
  • HAZ5: Listed wastes
  • HAZ6: Certain substances that are toxic under CEPA
  • HAZ7: Circuit boards and display devices
  • HAZ8: Non-rechargeable and rechargeable cells and batteries
  • HAZ10: Substances that release a gas
  • HAZ11: Waste or recyclable material containing or composed of asbestos
  • HAZ12: Environmentally hazardous substances that could be harmful if released
  • HAZ13: Substances or wastes that produce a hazardous leachate

Because we know you’re going to ask, there’s no HAZ9 code because it doesn’t exist within the internationally recognized Globally Harmonized System (GHS) of chemical classification. Eh?

• Physical hazard categories relative to transport. These categories are consistent with TDG regulations. They are:
  • Gas-related hazards (i.e., flammable gases, aerosols, oxidizing gases, pressurized gases, and simple asphyxiants)
  • Liquid and solid flammable materials (i.e., flammable liquids, flammable solids, and combustible dusts)
  • Reactive and self-igniting materials (i.e., self-reactive substances & mixtures, pyrophoric liquids, pyrophoric solids, self-heating substances & mixtures, and water-reactive substances)
  • Oxidizing Materials (i.e., oxidizing liquids, oxidizing solids, and organic peroxides)
  • Other Physical Hazards (i.e., corrosive to metals, pressurized chemicals, and physical hazards not otherwise classified as CCOHS hazardous)

(N.B. Explosives are covered under the Explosives Act in lieu of WHMIS.)

6. How are hazardous wastes classified per WHMIS relative to human health?

There are ten WHMIS subcategories for the health hazards, each of which has specific criteria and classification levels that determine how hazardous materials must be labelled and communicated in workplaces under WHMIS regulations. These are:

• Acute toxicity. Substances that can cause death or serious harm from a single or short-term exposure through oral, dermal, or inhalation routes.
• Aspiration hazard. Substances that can cause chemical pneumonia, pulmonary injury, or death if inhaled into the lungs.
• Carcinogenicity. Substances that can cause cancer or increase its incidence.
• Germ cell mutagenicity. Substances that can cause genetic mutations in reproductive cells that can be passed to offspring.
• Reproductive toxicity. Substances that can adversely affect sexual function, fertility, or development of offspring.
• Respiratory or skin sensitization. Substances that can cause allergic reactions in the respiratory system or skin after exposure.
• Serious eye damage or irritation. Substances that can cause permanent eye damage or temporary irritation to eyes.
• Skin corrosion/irritation. Substances that can cause irreversible damage to skin (i.e., corrosion) or reversible inflammatory effects (i.e., irritation).
• Specific target organ toxicity (repeated exposure). Substances that cause toxic effects to specific organs from repeated or prolonged exposure.
• Specific target organ toxicity (single exposure). Substances that can cause toxic effects to a specific organ from a single exposure.

7. How do Canadian regulations differ from that of the U.S.?

Okay, you really didn’t ask that.

But if your business is operating both here and south of the border, then you’ll have to be cognizant of some fundamental differences in classification approaches between us and them. That said:

Unlike our loveable frenemies down south, our government evaluates wastes based on measurable characteristics and testing protocols rather than presumptive listings. This risk-based approach focuses on the inherent properties of a waste rather than its specific source or composition.

In contrast, in the U.S. they compulsively maintain segregated lists of materials they deem hazardous: the “F-list” for wastes from specific industries, the “K-list” for wastes from specific sources, and the delightfully named “P-U lists” for specific chemicals that, we guess, smell bad. We mention this because—full disclosure—our federal government borrows heavily from our neighbour’s F- and K- lists. (See Q.10 “Listed wastes”)

Those Yankee F- and K- lists notwithstanding, we employ broader categorical approaches. E.g., federal guidance references “generic types of potentially hazardous wastes” and “activities that may generate potentially hazardous wastes” rather than using exhaustive waste stream listings.

Not that our hazardous waste classification system isn’t heavily influenced by international treaties and agreements. We tip our hats to the Basel Convention on the Control of Transboundary Movements of Hazardous Wastes and their Disposal and the OECD decision frameworks.

We also abide by something called the Cross-border Movement of Hazardous Waste and Hazardous Recyclable Materials Regulations, which contains multiple references to international classification systems for hazmat (see source).

8. What are specific hazmat labelling requirements per TDG regulations?

Under TDG regulations, dangerous goods must display standardized labels during transport. The system uses nine hazard classes (explosives, gases, flammable liquids, etc.) with distinctive diamond-shaped placards featuring symbols, colours, and class numbers.

Labels must be bilingual (English/French), weather-resistant, and clearly visible. Specific requirements vary by quantity thresholds. I.e., the bigger the container, the larger the placards.

9. What are hazmat labelling requirements per CEPA and EIHWHRMR?

CEPA and EIHWHRMR focus on environmental protection and workplace safety reporting. These regulations require facilities to maintain inventories of hazardous substances and report releases exceeding specified thresholds.

While not primarily labelling regulations, they mandate clear identification of toxic substances in facilities, and require Material Safety Data Sheets (MSDSs) for workplace chemicals.

Labels must identify environmental hazards and include precautionary statements. The system emphasizes pollution prevention, environmental monitoring, and ensuring workers and communities have access to information about chemical hazards in their vicinity.

10. What are hazmat labelling requirements per WHMIS?

WHMIS requires all hazardous products to have supplier labels with product identifiers, hazard pictograms, signal words (“Danger” or “Warning”), hazard statements, and precautionary statements in both official languages.

Workplace labels are required when chemicals are transferred from original containers. The system uses standardized pictograms (flame, skull, exclamation mark, etc.) to communicate physical, health, and environmental hazards. Employers must ensure workers receive training on label interpretation and have access to SDSs for all controlled products.

11. What are the key differences among TDG, CEPA, and WHMIS requirements labelling?

TDG focuses on transport safety with diamond placards and class-based identification, CEPA/EIHWHRMR emphasizes environmental protection and community right-to-know, while WHMIS targets workplace safety with GHS-aligned pictograms and detailed hazard communication.

TDG uses numerical classification (Class 1-9), while WHMIS employs pictographic symbols, and durability requirements for labels vary. I.e., TDG demands weather-resistant transport labels, while WHMIS allows workplace-specific labelling flexibility.

Information-depth requirements also differ. TDG provides basic hazard identification for emergency response, while WHMIS requires comprehensive hazard communication, including precautionary measures and first aid instructions.

12. How should you manage hazmat that falls under multiple CEPA waste categories during transport?

To ensure continuity between environmental classification and transportation safety requirements, documentation must clearly indicate all applicable CEPA waste categories while simultaneously meeting TDG format requirements.

In other words, materials falling under multiple CEPA waste categories require comprehensive TDG labelling reflecting all applicable transportation hazards. The most restrictive hazardous classifications typically govern primary labelling, with subsidiary risk labels for additional hazards.

Sound complicated? It is. Get expert help!

13. How can businesses ensure compliance given the compliance of a three-tiered regulatory structure?

We’re not superstitious. But did you notice this is Question #13? Our short answer is to get expert advice & help. On the longer side:

• Be careful to manage materials across the multiple CEPA waste categories, incorporating comprehensive labelling strategies that address each category’s specific requirements. (Bear in mind that waste characteristics or regulatory classifications can change—and often do.)
• Your workers must receive comprehensive training on hazardous classifications across all applicable systems, including workplace hazard recognition, label interpretation, safe handling procedures, and CEPA environmental awareness training.
• TDG training is required for hazmat handling & transportation preparation that emphasizes how different classification systems complement each other and how to interpret labels that may contain information from multiple regulatory frameworks.

14. Given the complexity of federal regulations, how should businesses handle classification & labelling uncertainties?

You should call us. Why?

Absent the knowledge requisite to making complex classification decisions, others will counsel that when materials fall into multiple WHMIS, CEPA, and TDG categories, you should just close your eyes, open your wallet, and apply the most restrictive classification, labelling, and handling procedures.

But we would suggest that spuriously increasing your overhead costs by treating a mildly hazardous waste as one that’s highly toxic, combustible, explosive, or worse, is neither clever advice nor good hazardous waste management. It diverts time, money, and resources that would be better spent building your business.

Just sayin’.

15. Where can you get comprehensive guidance about federal hazmat classification and labelling requirements?

As they tend to come from three different bureaucratic systems at irregular intervals, regulations about labelling & marking hazmat are plentiful, evolving, and challenging to track.

Managing their many aspects can divert your company’s human and budgetary resources from their core mission; and whether by unawareness or misunderstanding, noncompliance can subject you to pecuniary and even criminal consequences.

Don’t take chances. Get honest expert advice from a renowned provider of hazardous waste management services.

We’ve earned our reputation by anticipating the needs of our clients so that waste management doesn’t become a major distraction from their corporate mission.

For more information, contact us today. Or call 866-430-9421.

And thank you for reading our blog!