WorkSafeBC Workplace Chemical Requirements

Part 5 of the WorkSafeBC OHS Regulation (Chemical and Biological Agents) puts most of the duties for workplace chemicals on the employer. The employer must identify each hazardous substance and communicate its hazards (WHMIS labels, SDSs and training), store it safely, keep worker exposure below the BC exposure limits through monitoring and the hierarchy of controls, and provide hygiene and emergency washing facilities. Since the February 3, 2025 amendment, the employer must also have written emergency plans for hazardous substances.

Approach: I used the WorkSafeBC OHS Guidelines for Part 5, which quote each Regulation section, and checked them against WorkSafeBC's official Part 5 Regulation page. The page gave paraphrases and short quotes, not the full wording of every section; for sections 5.99 to 5.102 the official page gave only a heading-level summary, so their wording here comes from the guideline excerpts.

1. General duty and WHMIS (ss. 5.2 to 5.18)

• General duty (s. 5.2): where workers are exposed to hazardous chemical or biological agents, the employer must provide clear identification of the substance and its health effects (labels and SDSs), clear communication of that information, written procedures for safe handling and emergencies, and training for supervisors and workers (WorkSafeBC Part 5).
• Scope: a "hazardous product" is anything classified under the federal Hazardous Products Act Schedule 2 hazard classes. Sections 5.4 to 5.18 apply to hazardous products used, stored or handled at a workplace ^[1].
  • The supplier label and SDS provisions do not apply to explosives, drugs/food/cosmetics/devices, pest control products, radioactive nuclear substances and consumer products.
  • The provisions do not apply at all to wood, tobacco, manufactured articles and goods moving under the Transportation of Dangerous Goods legislation.
  • For hazardous waste, the employer "must ensure the safe storage and handling" through training and information ^[1].
• No use without compliance (s. 5.4(1)): a hazardous product must not be used, stored or handled unless the WHMIS requirements on labels, product identifiers, SDSs and education/training are met (WorkSafeBC Part 5).
• WHMIS program (s. 5.5): the employer must set up and keep an effective program, in consultation with the joint committee or health and safety representative. It must be reviewed at least once a year (sooner if conditions or hazard information change) and must include periodic checks of worker knowledge ^[2].
• Education and training (ss. 5.6, 5.7): workers get general WHMIS education. Workers who use or may be exposed to a product are trained on:
  • label and SDS content;
  • safe use, storage, handling and disposal, including products in pipes, vessels and conveyances;
  • fugitive emissions;
  • emergency procedures ^[3].
• Labels (ss. 5.8 to 5.13):
  • products received must carry supplier labels;
  • products made at the workplace, or decanted into other containers, need workplace labels;
  • piping systems and vessels are handled through training plus labels, placards or colour coding;
  • placards may be used in some cases;
  • laboratory samples have alternative rules.
• SDSs (ss. 5.14 to 5.18):
  • the employer must obtain a supplier SDS that complies with the Hazardous Products Regulations, and prepare one for products it makes;
  • SDSs must be "readily available" at the workplace;
  • confidential business information may be withheld only through a claim under s. 5.18, and hazard information may not be deleted (WorkSafeBC Part 5).

2. Containers, storage and flammables

• Containers must be in good condition and resistant to what they hold (ss. 5.20, 5.21) (WorkSafeBC Part 5).
• Open containers that could pose a hazard must be sealed or covered when not in use (s. 5.22) ^[4].
• Incompatible substances must not be stored where they could mix if a container leaks or breaks (s. 5.24) ^[5].
• Hazardous substances must be stored in a designated area, so they will not readily fall, be dislodged, be damaged or be exposed to extreme temperatures (s. 5.25) ^[5].
• Further guidelines cover ignition sources, bonding and grounding, and pressurized containers (ss. 5.27 to 5.38) ^[6][7].

3. Exposure limits (ss. 5.48 to 5.52)

• Limits (s. 5.48): unless the Board determines otherwise, no worker may be exposed above the ACGIH ceiling, STEL or 8-hour TWA ^[8]. Where BC departs from ACGIH, the BC values are in the Table of Excluded Substances in Policy R5.48-1. WorkSafeBC's guiding principle is to eliminate exposure or reduce it as far as reasonably achievable below the limit ^[8].
• Excursion limits (s. 5.49): for substances with only a TWA, exposure must not exceed 3× the TWA for more than a total of 30 minutes, or 5× the TWA at any time ^[9].
• Extended shifts (s. 5.50): the TWA is multiplied by a reduction factor based on shift length ^[9]:

Work period in a 24-hour day	TWA factor
More than 8, up to 10 hours	0.7
More than 10, up to 12 hours	0.5
More than 12, up to 16 hours	0.25
More than 16 hours	0.1

• Mixtures (s. 5.51): where two or more substances have similar toxicological effects, their exposures are treated as additive, and the sum of each exposure as a percentage of its limit "must not exceed 100%" ^[10].
• Skin absorption (s. 5.52): where skin absorption may add to exposure, effective measures must be taken to limit it ^[11].

4. Assessing exposure and exposure control plans (ss. 5.53 to 5.59)

• Monitoring (s. 5.53): the steps escalate ^[12]:
  1. A walkthrough survey covering all routes of exposure, repeated whenever work conditions change in a way that could raise exposure.
  2. Air sampling if the survey shows a risk of overexposure.
  3. Further monitoring if exposure may exceed 50% of the limit, or if exposure cannot be measured at 50%.
  • Methods must be acceptable to the Board, and results must be given to workers on request.
• Exposure control plan (s. 5.54):
  • When it is required: exposure is or may be above 50% of the limit, measurement at 50% is not possible, or another section requires one ^[13].
  • Other sections that require a plan: designated substances (5.57), asbestos, biological agents, hazardous drugs, lead, silica and toxic process gases ^[13].
  • It has seven required elements: purpose and responsibilities; risk identification, assessment and control; education and training; written work procedures; hygiene facilities and decontamination; health monitoring; and documentation. The last four apply "when required" ^[14].
  • It must be reviewed at least once a year with the joint committee or worker representative (WorkSafeBC Part 5).
• Hierarchy of controls (s. 5.55): the employer must eliminate the exposure or control it below harmful levels and below the limit, using substitution, engineering controls, administrative controls or PPE. A substitute's hazards must be known and must reduce risk. PPE may be the primary control only if ^[15]:
  • other controls are not practicable;
  • extra protection is needed because other controls are insufficient; or
  • the conditions are temporary or an emergency.
• Designated substances (s. 5.57): this covers ACGIH A1/A2 or IARC 1/2A/2B carcinogens, ACGIH reproductive toxins, ACGIH sensitizers and substances with an ACGIH "L" endnote. The employer must replace them "if practicable" with a lower-risk material; if not, it must run an exposure control plan that keeps exposure as low as reasonably achievable below the limit ^[16].
• Protective policy (s. 5.58): for reproductive toxins and sensitizers, the employer needs policy and procedures, which may include protective reassignment. These must cover workers who are pregnant or intend to conceive, and workers who are or may be sensitized ^[17].
• Investigating symptoms (s. 5.59): records of investigations into worker symptoms must be made available to workers and kept for at least 10 years (WorkSafeBC Part 5).

5. Ventilation, hygiene and emergency washing

• Ventilation: systems for controlling air contaminants (not HVAC) must be designed, installed and maintained using established engineering principles (ss. 5.60, 5.61) (WorkSafeBC Part 5).
• Personal hygiene (s. 5.82): where skin or clothing contamination could harm a worker, the employer must supply protective clothing, launder or dispose of it regularly, provide wash facilities and allow washing time before breaks. For high-hazard processes (for example lead, mercury, asbestos, silica or pesticides), separate street and work clothing lockers, heated showers between the rooms, and time to shower before the end of the shift are also required ^[18].
• Emergency washing (s. 5.85): appropriate emergency washing facilities must be provided within the work area wherever eyes or skin may be exposed to harmful, corrosive, burning or irritating materials. Section 5.88 requires a risk assessment, and Table 5-3 sets out the equipment type and location ^[19].

6. Emergency planning (ss. 5.97 to 5.104, amended February 3, 2025)

• Scope (s. 5.97(2)): these sections apply to emergencies inside or outside the workplace, and to any hazardous substance that could cause an emergency or make one worse ^[20].

• Inventory (s. 5.99): a written inventory of each substance present in a quantity that may endanger a person in an emergency. For each one it lists the physical state and hazards, maximum container capacity, maximum quantity, location, and how to access health and safety information ^[21].

• Response plan (s. 5.101): a written emergency response plan based on the inventory and risk assessment (s. 5.100). It must include assigned roles and a program of training and drills (s. 5.104). WorkSafeBC expects drills at least once a year ^[22].

• Procedures (s. 5.102): written procedures for:

  • notification;
  • evacuation or shelter-in-place;
  • keeping people out of unsafe areas;
  • confirming that everyone is safe.

  Notification includes people outside the workplace if they may be at risk of serious injury, illness or death ^[23].

• Using an existing plan: an environmental emergency plan under the federal Environmental Emergency Regulations can serve for this purpose if it contains every element both regulations require ^[22].

Several substances have their own rules in Part 6 (asbestos, lead, silica, hazardous drugs, toxic process gases), each with its own exposure control plan trigger ^[13]. I can go through any of those, or look up specific BC exposure limits by substance or CAS number.