Occupational health and safety: scope and jurisdiction

Overview

A workplace accident can raise several legal questions at once: whether a danger should have been prevented, whether the injured person is insured, which legislature governs the undertaking, and which body may order a remedy. A single answer about the employer's industry or the worker's job title cannot resolve all of them.

Quebec's Act respecting occupational health and safety, CQLR, c. S-2.1 (AOHS), organizes prevention. The Act respecting industrial accidents and occupational diseases, CQLR, c. A-3.001 (AIAOD), organizes compensation and related measures following an employment injury (lésion professionnelle). Their purposes interact, but their definitions, territorial rules and constitutional limits differ. Establishing that a person falls within a statute also leaves the conditions of the particular right to be proved.

Learning Objectives

• Separate prevention, compensation and employment protection, and identify the institution responsible for each question.
• Apply the different worker and employer definitions, including deemed coverage, exclusions and relationships involving several enterprises.
• Determine the relevance of provincial or federal jurisdiction, work location, domicile and competing compensation regimes.

Prevention and compensation have different legal functions

Prevent danger and repair its consequences

Section 2 AOHS places elimination of hazards at their source at the centre of prevention. It protects health, safety and both physical and psychological integrity. Worker and employer participation is part of this statutory design. Protective equipment has a role within the prevention hierarchy; choosing it does not displace the statutory objective of eliminating hazards at source. A prevention problem can therefore exist before anyone suffers an injury.

Under section 1 AIAOD, compensation addresses employment injuries and their consequences. Depending on the statutory conditions, the response includes income replacement, compensation for bodily injury, health services, rehabilitation and return to work. An industrial accident (accident du travail), an occupational disease (maladie professionnelle), and a recurrence, relapse or aggravation require their own qualification analysis. Exposure to a hazard, a complaint about harassment and a medical diagnosis are distinct facts; none automatically establishes every condition of compensation.

The employer-funded scheme developed around a trade-off between statutory compensation and restrictions on ordinary civil proceedings. Sections 438 and 439 AIAOD generally bar the worker's or deceased worker's beneficiary's ordinary civil action against the worker's employer because of the employment injury. Rights against other persons require a separate examination; section 441, for example, gives particular rules for another employer subject to the scheme. A claim for compensation is not an unrestricted substitute for every damages action, and acceptance does not establish a penal offence.

Public order and the limits of fault

Both statutes are of public order (ordre public). Section 4 of each prevents private agreements from taking away statutory protection, while allowing more favourable provisions within the statutory framework. A contractor label, waiver or collective agreement cannot conclusively decide coverage against the real relationship. Conversely, generous interpretation of social legislation does not permit a decision-maker to erase an express exclusion or create a right that the legislature has withheld.

Section 25 AIAOD provides no-fault compensation (indemnisation sans égard à la faute). Ordinary carelessness by a worker does not, by itself, defeat a claim. The narrow section 27 exclusion requires an injury or disease attributable solely to the worker's gross and wilful negligence. It does not apply where that conduct results in death or serious permanent impairment of physical or psychological integrity. The seriousness, voluntary character and exclusive causal role must all be addressed; a safety-rule breach alone does not answer that test.

An employer's failure to comply with its statutory obligations does not deprive a covered worker of rights under section 26 AIAOD. That protection matters where an employer has failed to register or pay what it owes. It does not, however, create optional insurance that was never taken out for someone whose coverage requires a specific declaration or registration.

Identify the person and the relationship under each statute

Paid employment, apprenticeship and actual subordination

The ordinary worker definition in section 2 AIAOD concerns a natural person doing remunerated work for an employer under a contract of employment or apprenticeship, subject to stated exclusions. The contract of employment (contrat de travail) is examined using art. 2085 CCQ and the purposes of the special statute. Work, remuneration and legal subordination (subordination juridique) must be considered together. Section 1 AOHS uses a broader definition in this respect: employment or apprenticeship work may be unpaid.

Assess how the relationship operates. Who assigns tasks, supervises their performance, controls schedules, evaluates the work and requires personal service? Skilled workers may exercise substantial professional judgment while remaining subordinate. Payment by commission or in kind, intermittent work and a short engagement do not necessarily exclude employment. Ownership of tools, tax treatment and the possibility of profit or loss are relevant facts, rather than independent answers. Regulatory obligations applying to everyone in an occupation do not necessarily show control by a particular client.

Article 2099 CCQ provides a useful contrast: a contractor or service provider ordinarily has free choice of means of performance and is not subordinate to the client. Economic dependence alone should not replace examination of legal control. A person may also occupy different legal positions for different activities. Classify the work connected with the alleged accident instead of assigning an immutable status to the person's whole working life.

In Dionne c. Commission scolaire des Patriotes, 2014 CSC 33, the protective purpose of the AOHS informed the interpretation of worker status for a substitute teacher. Acceptance of a supply assignment formed the employment relationship; exercising a statutory preventive-withdrawal right did not negate that relationship. The decision illustrates why capacity to perform the particular work safely must be distinguished from the existence of the employment contract.

Exclusions and extensions are specific to the scheme

An executive officer (dirigeant) of a legal person is excluded from the ordinary AIAOD worker definition for work performed for that legal person. The statutory definition requires the relevant board membership, or assumption of all board powers under a unanimous agreement, together with control and management functions. A registry entry or impressive job title does not dispense with the definition. Other exclusions concern a professional athlete whose sporting activity is the main source of income and specified family-type or intermediate resources. A director who is also an employee is not necessarily an excluded executive officer.

The AOHS takes a different approach to people who actually perform managerial or supervisory functions, represent the employer in relations with workers, or occupy the specified corporate positions. Its worker definition excludes those categories. The corporate-position exclusion preserves the exception for a director or officer designated by the workers or certified union to represent them in that capacity. Yet exclusion from the definition does not mean freedom from prevention duties. Section 8 AOHS imposes worker obligations on the specified persons and on employers personally working at a workplace.

Nor does the AOHS give every excluded person every worker right. Section 11 extends selected protections, including the rights referred to in sections 9 and 10 and specified preventive-withdrawal provisions. It does not automatically confer the general dangerous-work refusal in section 12. A manager's situation therefore requires examination of the particular right invoked, rather than a blanket statement that managers are either fully protected or entirely outside the statute.

Special legislation and agreements also govern certain childcare providers and family-type or intermediate resources. Their exclusion from an ordinary definition does not justify concluding that no protective arrangement exists. The same caution applies to particular arrangements involving Indigenous communities. Identify the governing text and agreement before applying the general rule.

Domestic workers, students and volunteers

Automatic AIAOD coverage for a domestic worker (travailleur domestique) employed by a private individual depends on the current statutory threshold: the work must be scheduled for at least 420 hours over 12 months for that individual, or for at least 30 hours weekly over seven consecutive weeks. The employer need not wait until the worker has actually accumulated the hours. The analysis concerns the employment arrangement and the services that must be provided. Hours for unrelated private employers cannot simply be pooled.

Since 6 April 2022, qualifying domestic work includes the household, care and other private services described by the definition. Section 8.3 AIAOD supplies the necessary establishment rule for the individual receiving those services. Below the threshold, personal protection may be available by registration. Government-supported home services, including the Chèque emploi-service arrangement, require separate attention because agreement-based coverage can apply even when ordinary domestic thresholds are not met. Sections 9 and 13 AIAOD cannot be used indiscriminately to bypass the domestic rules: section 8.2 excludes their application to activities of a domestic nature. CNESST, domestic workers.

An unpaid student undertaking an observation or work placement under an educational institution's responsibility may be deemed a worker under section 10 AIAOD, with the designated educational body treated as employer. The AOHS also expressly covers the qualifying student placement. Distinguish an organized placement from ordinary classroom exercises or an informal visit. A paid trainee may instead fall under the ordinary employment definition.

Volunteer work (travail bénévole) is not automatically insured merely because it is useful or approved. Section 13 AIAOD requires the recipient's agreement and the prescribed declaration to the CNESST; the right-to-return-to-work chapter does not apply to this coverage. Other provisions establish particular coverage for specified government programs, emergency assistance and institutional work. Identify the relevant category and its conditions instead of reasoning that every unpaid activity is insured or that none can be.

Worked example: a short domestic engagement

Factual Scenario

A private individual hires a caregiver for 30 hours each week over eight consecutive weeks. The caregiver is injured during the second week. The individual says coverage will begin only after 420 hours have actually been worked. The arrangement is outside a government home-services program.

Contractors and several possible employers require further analysis

A self-employed person may be deemed a worker

A self-employed worker (travailleur autonome) under the AIAOD works personally on their own account, alone or in partnership, without employees. Section 9 may nevertheless treat that person as a worker when they perform activities similar or related to those carried on in the recipient's establishment. The activities need not be indispensable to that establishment's survival. Establish the statutory relationship before turning to the exceptions.

The exceptions address a person who performs the activities simultaneously for several persons; an exchange of services with another self-employed person performing similar activities; work for several persons in turn while supplying the necessary equipment and doing short-duration work for each; or activities required only sporadically by the recipient. Each branch has its own conditions. In the successive-client branch, several clients, equipment and short duration are cumulative. A handful of invoices does not independently establish the exception, and the statute supplies no universal numerical duration threshold.

This deemed-worker rule concerns compensation. Section 7 AOHS separately imposes specified prevention duties on a self-employed person without workers who works for another where workers are present. It does not thereby grant all rights enjoyed by an AOHS worker. Eligible people may also seek personal protection (protection personnelle) under sections 18 to 23 AIAOD. Registration is prospective under its conditions, and compensation insurance does not itself create an AOHS preventive-withdrawal right. TAT, application of section 9.

Identify the employer without losing prevention responsibilities

Under section 2 AIAOD, the employer uses the worker's services for the purposes of its establishment (établissement). The work need not always occur inside that establishment. The AOHS employer definition does not impose the same establishment requirement. A private residence can sometimes constitute an establishment where the statutory business activities are actually carried on; an address on a contract alone proves little.

In a placement-agency relationship, compare recruitment, hiring, remuneration, training, supervision, discipline, evaluation and integration into the work. Contracts and payroll records are evidence, but the legal analysis must account for actual functions. Section 5 AIAOD preserves the employer relationship when an employer lends a worker. First establish that the supposed lender was indeed the employer: the provision does not automatically settle every dispute involving an agency.

Compensation classification also leaves prevention obligations to be examined. In Sobeys Québec inc. c. Commission de la santé et de la sécurité du travail, 2012 QCCA 1329, the application of section 51 AOHS extended beyond an employer's own employees in circumstances involving its control over prevention. Sections 51.1 and 51.1.1 AOHS respectively address persons using workers for their establishment without being their employer and the ineffectiveness of clauses limiting or transferring the statutory obligations of lending and user enterprises. Responsibility for payroll cannot be used as a complete answer to control of a dangerous workplace.

Constitutional jurisdiction must be determined by function

The undertaking's activities and the particular provision

Provincial jurisdiction is the starting point for labour relations. The Constitution Act, 1867 does not assign occupational health and safety as one indivisible subject to either legislature. The analysis instead examines the undertaking's habitual activities and the constitutional character of the obligation or remedy. A federal undertaking (entreprise fédérale) may arise from its own operations or from the sufficiently integrated relationship of an otherwise local undertaking with an identifiable federal undertaking.

In Tessier Ltée c. Québec (Commission de la santé et de la sécurité du travail), 2012 CSC 23, the enterprise mainly provided local crane, transport and equipment services. A relatively small stevedoring activity was integrated into its broader operations. Provincial jurisdiction remained applicable. For derivative federal jurisdiction, assess the actual relationship from both sides: the federal undertaking's dependence on the services and their place within the related enterprise. Useful services, federal customers or a connection with a federal field in the abstract do not establish the necessary integration. The organization of employees into distinct operating units can also matter.

The prevention conclusion differs from the compensation conclusion. Bell Canada c. Québec (Commission de la santé et de la sécurité du travail), [1988] 1 R.C.S. 749, establishes the constitutional inapplicability of the Quebec prevention regime to federal undertakings. Duties concerning work organization, inspection and preventive withdrawal cannot be imported simply because the objective is health. Federal prevention is addressed by the applicable federal framework, including Part II of the Canada Labour Code.

Provincial compensation legislation, however, can apply to private undertakings under both provincial and federal jurisdiction. Its location inside a compensation statute does not guarantee that every provision applies to a federal employer. In Purolator Courrier ltée c. Hamelin, [2002] R.J.D.T. 8 (C.A.), the Court rejected application of section 32 AIAOD in the employment-relations dispute before it. That holding requires attention to the specific provision and remedy; it does not decide that every rehabilitation measure, temporary assignment or mechanism enforcing compensation is excluded.

Nor does federal jurisdiction create a universal escape from provincial compensation-related civil immunities. In Marine Services International Ltd. c. Ryan (Succession), 2013 CSC 44, the Supreme Court upheld the constitutional application and operation of a provincial compensation statute's civil-action bar despite the maritime setting. Constitutional inapplicability and conflict between federal and provincial legislation are different issues, each requiring its own legal basis. A party seeking a constitutional declaration before the TAT must also address the applicable notice requirements.

Federal public employees and statutory incorporation

Federal public employees raise a further question. The Government Employees Compensation Act, R.S.C. 1985, c. G-5 (GECA), supplies the federal basis for provincial compensation rules and adjudication. Sections 2 to 4 require identification of covered employees, exclusions and the statutory incorporation mechanism. Doing work for a government-related client is not sufficient by itself. Section 3 excludes members of the regular Canadian Forces and members of the Royal Canadian Mounted Police; their position must be distinguished from that of other employees. GECA, sections 2–4.

In Martin c. Alberta (Workers’ Compensation Board), 2014 CSC 25, the Supreme Court held that provincial eligibility legislation and policies apply through GECA unless they conflict with the federal statute. The aim is comparable treatment within the same province, rather than identical outcomes for every federal public employee throughout Canada. A Quebec employment-injury presumption is therefore not excluded solely because the employer is federal. The federal law's express inclusions, exclusions and conflicting requirements still control.

The province where the employee is usually employed provides the ordinary compensation link under this federal framework, subject to its particular rules. An accident during travel does not necessarily transfer the file to the accident's location, and the Quebec territorial test cannot be used to defeat a contrary GECA entitlement. Equally, incorporation of compensation conditions does not automatically import every Quebec employment-protection remedy. Identify the federal gateway, the relevant provincial rule and the particular right before reaching a conclusion.

Location and domicile determine territorial coverage

An injury inside or outside Quebec

For an accident occurring, or an occupational disease contracted, in Quebec, section 7 AIAOD requires the employer to have an establishment in Quebec at the relevant time. The worker need not be domiciled in Quebec. An employer headquartered elsewhere may have a qualifying Quebec establishment; conversely, merely working temporarily in Quebec does not dispense with the establishment condition or any applicable agreement.

Section 8 AIAOD supplies two routes for work outside Quebec. The first requires that, at the time of the accident or disease, the worker be domiciled in Quebec and the employer have a Quebec establishment. The second concerns a worker no longer domiciled in Quebec: the worker must have been domiciled there when assigned outside Quebec, the work outside Quebec must not have exceeded five years at the relevant time, and the employer must then have a Quebec establishment. The five-year condition does not govern every worker who remains domiciled in Quebec.

Domicile (domicile) concerns a person's principal establishment and the intention reflected in the circumstances. Temporary residence abroad does not necessarily change it, and immigration status does not independently resolve it. Evidence can include the duration and purpose of departure, retained home, family arrangements and demonstrated intention. A worker's voluntary relocation is also not automatically an employer's assignment outside Quebec.

Section 8.1 AIAOD allows applicable agreements to alter the ordinary territorial rules. Always check them where another province or country is involved. An accepted injury's later consequences also require their own causal analysis; a subsequent move does not by itself erase the legal consequences of an injury already recognized.

Telework and competing schemes

Section 5.1 AOHS expressly applies the statute to telework (télétravail), subject to incompatible provisions, particularly those concerning the workplace. Working at home does not erase prevention obligations. It also does not authorize unrestricted home entry: section 179.1 requires the worker's consent or a court order meeting the statutory danger-based conditions for an inspector to enter a dwelling where telework occurs. That domestic protection should not be confused with constitutional or international territorial coverage.

The AOHS generally regulates workplaces in Quebec. A Quebec employer's office does not automatically export the entire prevention regime to work abroad, even where section 8 AIAOD extends compensation. Obtain separate answers for prevention and compensation rather than treating remote work as a single exception to both statutes.

Where the same injury actually gives entitlement under the AIAOD and a law outside the Quebec legislature, section 452 AIAOD requires an election of benefits (option) and notice to the CNESST. The ordinary period is six months; it is two years for a worker's claim arising from sexual violence. The applicable starting event is the accident, the disease's medical establishment and communication to the worker, or the resulting death, as applicable. Failure to elect and notify creates a presumption of waiver of AIAOD benefits. Applicable extensions and coordination rules must be examined separately. Filing an injury claim and making the required election are distinct procedural acts. AIAOD, section 452.

Worked example: a Quebec employee assigned abroad

Factual Scenario

An employer with an establishment in Quebec assigns an employee to a two-year project abroad. The employee retains a Quebec domicile and suffers an accident while performing assigned work. The employer argues that any accident outside Quebec falls exclusively under the host country's scheme.

Match the institution and procedure to the question

The CNESST administers the two Quebec statutes, decides compensation and financing questions within its jurisdiction, and acts through inspectors in prevention matters. The Tribunal administratif du travail (TAT) is a separate adjudicative body. Its occupational health and safety division hears the disputes assigned to it by statute. An administrative review (révision administrative) within the CNESST should therefore be distinguished from a contestation before the TAT and from judicial review by a court.

Procedure depends on the decision. Many compensation decisions first pass through administrative review, while specified categories permit a direct contestation. There is no universal option to bypass review for every CNESST decision. Inspection decisions follow their own expedited framework, and contestation does not automatically suspend an inspector's order. Record the instrument, decision type, notification date, authorized applicant, deadline and any immediate effects before choosing the route.

A grievance arbitrator may hear an eligible unionized worker's reprisal dispute where the worker chooses the collective agreement procedure under section 32 AIAOD or section 227 AOHS. The same dispute cannot simply be duplicated through both a grievance and a statutory complaint. Penal proceedings for offences under these statutes go to the Court of Quebec, not to the TAT. Their purpose and proof differ from a worker's compensation claim.

Workplace participation bodies perform prevention functions; they do not decide compensation appeals. Establishments and construction sites also have different prevention arrangements. The modern establishment framework took effect on 1 October 2025, with duties shaped by workforce size, the statutory conditions and regulatory transition rules. Construction sites have their own mechanisms and applicable opening-date transitions. A committee, representative, liaison officer, principal contractor or prevention mutual should therefore be assigned its actual role rather than treated as a substitute for the employer, CNESST or tribunal.

Use the course's Quebec prevention lesson for participation mechanisms, the injury qualification lesson for proof of the injury, and the CNESST claims lesson for filing requirements. Coverage is the entrance to those analyses; it does not decide their outcomes.

Practice Checklist

• Identify the requested result: prevention, compensation, employment protection, financing, civil damages or a penal sanction.
• Apply the correct statute's worker and employer definitions to the actual relationship and activity.
• Check exclusions, deemed status, agreements and any registration or declaration required for coverage.
• Determine the undertaking's actual functions and the constitutional character of the particular provision invoked.
• Establish the relevant work location, employer establishment, domicile and assignment history.
• Examine competing entitlement and any required election separately from the injury claim.
• Identify the competent institution, available procedure, notification date and applicable deadline.