Occupational Health and Safety and Mental Health: What Canadian Employers Need to Know

Updated13 August 2026

What occupational health and safety has to do with mental health

Occupational health and safety, commonly called OHS, is the body of law, standards, and practices aimed at preventing work-related injuries, illnesses, and diseases. In Canada, OHS legislation exists in 14 jurisdictions, one federal and 13 provincial or territorial, each with its own act, regulations, and enforcement body. Most people associate OHS with physical hazards such as falls, machinery, and protective equipment, but Canadian OHS law and guidance now explicitly extend to psychological hazards as well. The Canadian Centre for Occupational Health and Safety frames total worker well-being as physical, psychosocial, and mental, and every Canadian OHS jurisdiction includes a general duty clause requiring employers to take every reasonable precaution to protect worker health and safety, a duty that applies even where no specific regulation names the hazard.^[1]^[2]

1. Psychological health and safety, defined

A psychologically healthy and safe workplace is one that promotes workers’ psychological well-being and actively works to prevent harm to worker psychological health, including in negligent, reckless, or intentional ways. This definition comes from the National Standard of Canada for Psychological Health and Safety in the Workplace. Psychosocial hazards are elements of the work environment, management practices, or organizational practices that pose a risk to mental health and well-being, and can also produce physical effects. Examples include heavy workload, low job control, harassment, violence, poor recognition, and unclear roles. Psychological safety, a team-level construct describing a shared belief that people can speak up without fear of embarrassment or punishment, is related but distinct: psychological safety is an interpersonal climate concept, while psychological health and safety is an OHS-style system for managing hazards and preventing harm across an organization.^[3]^[4]

2. Psychosocial hazards recognized in Canada and internationally

Canadian authorities and international bodies recognize a consistent set of psychosocial hazards. These include excessive workload and tight deadlines, low autonomy or decision latitude, role ambiguity and conflicting expectations, low social support from supervisors or co-workers, poor organizational culture marked by incivility or unfairness, unclear or inconsistent leadership, harassment, bullying and violence including client or patient aggression, inadequate recognition and reward, work-life conflict, poorly managed organizational change, and trauma exposure for frontline workers such as healthcare and emergency personnel. CCOHS identifies these as psychosocial risk factors that can contribute to stress-related workplace injuries and negatively affect both mental health and organizational outcomes.^[3]^[4]

3. How psychosocial hazards affect mental health

A meta-analysis of longitudinal studies found that job strain, low decision latitude, low social support, high psychological demands, effort-reward imbalance, and job insecurity prospectively predict common mental disorders such as depression and anxiety. The Job Demand-Control model, supported by decades of research, shows that jobs combining high demand with low control are associated with emotional exhaustion, psychosomatic complaints, and poorer psychological well-being, while control and social support buffer these negative effects. Psychosocial stress at work is also linked to physical outcomes including hypertension, cardiovascular disease, and metabolic dysregulation, underscoring that psychological hazards have bodily consequences as well as mental ones. A 2025 systematic review of personal support workers found that aggressive client behaviour, role ambiguity, resource inadequacy, and high workload were among the most frequently reported stressors linked to burnout, depression, and anxiety.^[14]^[20]

4. Canadian data on work stress and burnout

In 2023, 21.2% of employed Canadians reported high or very high work-related stress, with heavy workload cited by 23.7% and difficulty balancing work and personal life cited by 15.7% as causes. In the 12 months before the survey, 7.5% of employed Canadians took time off because of stress or mental health reasons, averaging 2.4 lost days per worker. Roughly one in five Canadian employees, 21%, report frequently experiencing burnout from work, and separate 2024 data found 24% report being burnt out always or most of the time. Seven in ten Canadian workers report having experienced some form of harassment or violence at work, with many reporting consequences such as disturbed sleep and well-being effects.^[8]

5. Employer legal responsibilities for psychological hazards

Across Canada’s 14 OHS jurisdictions, the general duty clause requires employers to take every reasonable precaution to protect worker health and safety, and this duty applies to psychosocial hazards even where they are not named in a specific regulation. Federally regulated workplaces are additionally required to address workplace harassment and violence, defined to include conduct reasonably expected to cause psychological injury or illness. Provinces and territories increasingly reference psychological hazards, harassment, and violence explicitly in OHS legislation or guidance, and several provinces have presumptive PTSD legislation for specified occupations, recognizing certain psychological injuries as work-related unless proven otherwise. Psychological injuries are compensable across Canadian workers’ compensation systems when predominantly caused by work, typically requiring a diagnosed mental disorder and meeting jurisdiction-specific criteria such as a traumatic event or significant work-related stressors.^[2]^[9]^[10]^[11]^[12]

6. The National Standard of Canada and related frameworks

The National Standard of Canada for Psychological Health and Safety in the Workplace, CSA Z1003-13/BNQ 9700-803/2013, reaffirmed in 2022, is a voluntary standard specifying a management-system approach to identify and control psychosocial hazards and promote psychological health. It was championed by the Mental Health Commission of Canada and organizes 13 psychosocial factors, including workload management, civility and respect, clear leadership, engagement, involvement and influence, organizational culture, recognition and reward, and balance. ISO 45003:2021 provides an international counterpart, offering guidelines for managing psychosocial risks within an OHS management system, and aligns conceptually with the Canadian standard. Adopting either framework is voluntary rather than a legal requirement, but both represent best practice and may be referenced by regulators, insurers, and courts when assessing an employer’s due diligence.^[5]^[6]^[7]

7. Identifying psychosocial hazards in your organization

Structured assessment tools aligned with CSA Z1003, such as Guarding Minds at Work, allow organizations to assess the 13 psychosocial factors using validated surveys. Combining quantitative surveys with qualitative methods, such as focus groups, interviews, and incident reviews, helps capture hazards like harassment, trauma exposure, and change-related stress that surveys alone may miss. Integrating psychosocial hazard assessment into existing OHS risk-management processes, the same plan-do-check-act cycle already used for physical hazards, keeps psychological risk management consistent with an organization’s broader safety system rather than treating it as a separate program.^[18]

8. Evidence-supported interventions

Control measures for psychosocial risk follow the same hierarchy-of-controls logic used for physical hazards. Workload management, adjusting workloads and deadlines and ensuring staffing matches demand, is a foundational control. Job design and control, increasing employee involvement in decisions about how work is done and clarifying roles, is another. Leadership and culture measures, holding leaders accountable, modelling civility, and providing consistent communication, along with strengthened social support and access to psychological services, round out the organizational response, supported by harassment and violence prevention policies with clear reporting and investigation procedures.^[3]^[4]

Manager training shows measurable benefits. A systematic review and meta-analysis found that manager mental health training significantly improves managers’ knowledge, non-stigmatizing attitudes, and self-reported supportive behaviour. A cluster randomized controlled trial found that a four-hour manager mental health training programme significantly reduced work-related sickness absence, with an estimated return of £9.98 per £1 spent. Canadian economic analysis has found a median annual return on investment of CA$1.62 per $1 invested in workplace mental health programs, rising to CA$2.18 after three or more years, though methods vary across studies and Canadian data remain limited.^[15]^[16]^[17]

9. Common misconceptions

OHS is often assumed to be only about physical safety, but Canadian OHS law and practice cover both physical and psychological hazards, and the general duty clause applies to psychosocial risks even where not explicitly named. Psychological safety and psychological health and safety are also often used interchangeably, but psychological safety is a team-climate construct while psychological health and safety is an OHS-style system for managing hazards; both matter, but they are not the same thing. Having an employee assistance program is sometimes treated as sufficient, but an EAP is an important support that does not replace the employer’s duty to identify and control psychosocial hazards at their source. Adopting CSA Z1003 is voluntary, not a legal requirement, though it represents best practice. Finally, mental health training alone will not fix a hazardous workplace; work design, leadership, culture, and hazard controls remain critical to reducing risk.^[3]^[5]

Occupational Health and Safety and Mental Health: 3 Things HR Can Do This Week

1. Confirm your general duty clause covers psychosocial hazards in writing

HR can pull the OHS act or regulations for each jurisdiction where the organization operates and confirm that internal policy documents explicitly name psychosocial hazards, such as workload, harassment, and violence, alongside physical hazards, rather than leaving mental health out of the formal OHS program.^[2]

Outcome: The organization’s OHS documentation reflects its actual legal scope, reducing the risk of treating psychological hazards as a separate, informal program.

2. Run a psychosocial factor check using a validated tool

HR can use a free assessment such as Guarding Minds at Work to survey one department against the 13 psychosocial factors in the National Standard, generating a baseline that identifies the two or three factors most in need of attention.^[18]

Outcome: HR gains a concrete, standard-aligned starting point for hazard identification instead of relying on anecdotal reports.

3. Brief managers on the difference between psychological safety and psychological health and safety

HR can add a short clarification to manager training materials distinguishing the team-level climate of psychological safety from the organization-level OHS system of psychological health and safety, so managers understand that both matter and neither substitutes for the other.^[3]

Outcome: Managers stop treating open team communication as the whole solution and understand their role in a broader hazard-control system.

Featured Resource: Mental Health Continuum Tool