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Hazard Identification and the Hierarchy of Controls
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A regulatory inspection report sits on the desk of the operations manager at a mid-sized metal fabrication facility in southwestern Ontario, and its findings have prompted an urgent review of the company's entire approach to workplace safety. The facility employs approximately 85 workers across 2 shifts, operating cutting, welding, grinding, and finishing processes that expose workers to a range of physical, chemical, and ergonomic hazards. The inspector's report, issued following an unannounced visit 3 weeks earlier, identified multiple deficiencies: incomplete hazard assessments for several work stations, inconsistent application of control measures across similar operations, missing or outdated Safety Data Sheets for 4 chemical products in active use, and inspection records that showed gaps of up to 6 months between documented workplace inspections in certain production areas.

The facility has operated for 12 years under its current ownership, and until 18 months ago, its safety record was unremarkable. A lost-time injury rate that had held steady at roughly 2.3 incidents per 100 workers began climbing after the retirement of a long-serving health and safety coordinator whose institutional knowledge had never been formally captured in written procedures or documentation. The replacement coordinator, hired from outside the organization 14 months ago, inherited binders of paper records in varying states of completion, an electronic filing system with no consistent naming conventions, and a joint health and safety committee that had been meeting irregularly. Worker training records existed for initial WHMIS orientation but showed no evidence of refresher training or job-specific hazard communication for workers who had changed roles within the facility.

The most recent incident preceding the inspection involved a worker who sustained burns to both forearms while operating a plasma cutting station. The investigation revealed that the required heat-resistant sleeves had been available but not worn, that the hazard assessment for that station had last been reviewed 27 months earlier despite equipment upgrades in the interim, and that the worker had received no documented training on the specific hazards of the upgraded equipment. The employer now faces decisions about how to rebuild its hazard identification processes, what methodology to apply when assessing and prioritizing risks, how to structure control measures in accordance with legal expectations, what documentation practices will satisfy due diligence requirements going forward, how frequently and thoroughly to conduct workplace inspections, and how to communicate hazard information effectively to workers who speak 4 different first languages across the workforce.

Documenting Hazard Assessments for OHS Due Diligence

Every Canadian employer carries a legal duty to provide a safe workplace, but that duty means little without evidence to prove it was fulfilled. Hazard assessments form the backbone of any occupational health and safety program, yet the assessment itself is only half the equation. The documentation of that assessment, how it is recorded, maintained, updated, and made accessible, determines whether an employer can demonstrate due diligence when a workplace incident occurs, an inspector arrives, or a prosecution unfolds. Across Canadian jurisdictions, the expectation is not merely that employers identify hazards and implement controls, but that they create a verifiable record showing they did so systematically, competently, and in good faith. This lesson examines what proper hazard assessment documentation looks like, why it carries such legal weight, and how HR professionals and business owners can build documentation practices that protect workers and shield organizations from liability.

The legal foundation for hazard assessment documentation flows from the general duty clauses found in occupational health and safety legislation across Canada. Under the Canada Labour Code, Part II, as of the date of authorship, federally regulated employers must ensure the health and safety of every person employed by them. The Occupational Health and Safety Act of Ontario imposes a similar duty, as do the Workers Compensation Act and the Occupational Health and Safety Regulation in British Columbia, the Occupational Health and Safety Act in Alberta, the Saskatchewan Employment Act and its occupational health and safety provisions, and the Act respecting occupational health and safety in Quebec. While the precise wording differs across these statutes, the underlying principle is consistent: employers must take every reasonable precaution to protect workers from foreseeable hazards. The concept of due diligence, which serves as the primary defence against quasi-criminal charges under OHS legislation, requires employers to prove they took all reasonable steps to prevent the violation or harm in question. Documentation provides that proof. Without written records, an employer's claim that they conducted a thorough hazard assessment becomes an unsubstantiated assertion, unlikely to withstand scrutiny from investigators, adjudicators, or courts.

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