Occupational Health and Safety — Ontario Employment Law
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About Occupational Health and Safety
The Occupational Health and Safety Act (OHSA) serves as the core legislative framework governing workplace safety, violence, and harassment for most workers in Ontario. Unlike the Workplace Safety and Insurance Act (WSIA), which provides no-fault financial compensation after an injury or illness occurs, the OHSA is fundamentally preventative. Its primary objective is to eliminate workplace hazards before they cause harm through a shared framework called the Internal Responsibility System (IRS). Under this system, Ontario workers are granted three fundamental rights: the right to know about workplace hazards, the right to participate in safety initiatives (often via a Joint Health and Safety Committee), and the critical right to refuse dangerous work without fear of reprisal.
Employers bear the heaviest legislative burden under the OHSA. They are legally required to "take every precaution reasonable in the circumstances for the protection of a worker." When a breach occurs—whether it involves tripping hazards left in a warehouse aisle, inadequate guarding on a machine, or a failure to implement a proper workplace harassment policy—the employer and its directors can face regulatory prosecution by the Ministry of Labour. These are typically strict liability offences. This means the prosecutor does not need to prove the employer intended to create a danger; simply proving the hazard existed is enough. To avoid conviction, an employer must rely on the "due diligence" defence, proving they took every reasonable step to prevent the incident.
For workers facing unsafe conditions or toxic environments, the OHSA strictly prohibits employer reprisals. You cannot be legally fired, demoted, or disciplined for reporting hazards, seeking compliance, or giving evidence to an inspector. However, Ontario courts have firmly ruled that the OHSA does not create a standalone civil cause of action for damages. For example, you cannot generally sue your employer for "negligent investigation" under the OHSA directly. Instead, severe safety or harassment failures may act as grounds for constructive dismissal or support human rights litigation. Because the intersection between statutory safety complaints, regulatory inspections, and job security is notoriously complex and heavily dependent on the exact facts of your dispute, consulting an Ontario employment lawyer is crucial to understanding exactly which legal avenues are best suited to protect your rights and reputation.
Frequently Asked Questions
What are my legal rights if I believe my work is unsafe?
Under the OHSA, you have the right to refuse work that you reasonably believe is likely to endanger your health or safety. If you refuse, you must report it to your supervisor immediately so an internal investigation can take place, often involving a safety representative. If the issue remains unresolved, it can be escalated to a Ministry of Labour inspector.
Can I sue my employer directly if they violate the Occupational Health and Safety Act?
Generally, no. Ontario courts have ruled that the OHSA does not create a standalone civil cause of action, meaning you cannot sue your employer specifically for an "OHSA breach" or negligent hazard investigation. However, unresolved safety hazards or harassment might give you grounds to claim constructive dismissal or pursue a grievance, which is why reviewing your case with a legal professional is highly recommended.
Does the OHSA protect me from workplace violence or harassment by non-employees?
Yes. Ontario's OHSA obligations require employers to assess the risks of workplace violence and implement policies to address workplace harassment from all sources. This includes protecting workers from aggressive customers, contractors, or members of the public who interact with the workplace.
What happens to the employer if they are charged under the OHSA?
Employers charged by the Ministry of Labour face provincial offences. Because these are usually strict liability offences, the employer can be fined heavily or penalized unless they can prove "due diligence"—meaning they must demonstrate to the court that they took every reasonable precaution to prevent the safety breach.
Is there a time limit for prosecuting an employer for safety violations in Ontario?
Yes. Under Section 69 of the OHSA, there is generally a strict two-year limitation period. Charges must be laid within two years of the date the offence occurred or the date a Ministry of Labour inspector first became aware of the alleged offence.
Can I be fired for reporting a safety hazard or filing a harassment complaint?
No. Section 50 of the OHSA strictly forbids employers from dismissing, disciplining, or penalizing a worker in any way for acting in compliance with the Act or for seeking its enforcement. If you suffer a reprisal, you can challenge the employer's actions before the Ontario Labour Relations Board or through civil litigation.
Common Scenarios
- An employee notices that a heavy piece of manufacturing machinery lacks the protective guards required by regulations, refuses to operate it until fixed, and is subsequently suspended without pay.
- A worker in a retail store is repeatedly subjected to aggressive, discriminatory insults by a regular vendor; the employee files a formal complaint under the employer's OHSA workplace harassment policy, but management refuses to investigate.
- A warehouse worker trips over a dismantled skid left carelessly in a walking aisle, prompting the Ministry of Labour to inspect the facility and prosecute the corporate employer for failing to keep the workplace hazard-free.
- Following a major workplace safety audit, an employee faces subtle retaliation, such as having their shifts reduced or being isolated from team meetings, shortly after they provided a witness statement to a government inspector.
What You Should Know
- Always create a written record (such as an email to a supervisor or HR) when you first report a safety hazard or harassment concern, as this paper trail is vital if you later experience a reprisal.
- Do not assume a Ministry of Labour investigation will result in financial compensation for you personally; to recover lost wages or damages for toxic environments, you will likely need to engage independent employment counsel.
- If you refuse unsafe work, ensure you remain at a safe place in the workplace during your normal working hours and actively participate in the employer's subsequent investigation.
- Ensure you know who your Joint Health and Safety Committee (JHSC) representatives are, as they have specific statutory powers to help investigate your claims and can act as an important buffer between you and management.
Featured Cases
General Motors of Canada Company v. Osita-Adubasim
2023 ONSC 1723 (CanLII) · 2023-03-14Workplace Harassment: Interlocutory Injunction Granted
This is an interlocutory proceeding where the plaintiff sought an injunction to protect employees and contractors from trespassing, harassment, and threats by the defendant. The court found a serious issue to be tried and that irreparable harm, including physical and psychological harm, was likely, leading to the granting of an injunction under the Occupational Health and Safety Act and the Courts of Justice Act.
Lee v. Magna International Inc.
2021 ONSC 2899 (CanLII) · 2021-04-20No Tort of Negligent Workplace Investigation in Ontario
This is a procedural ruling on a motion to amend pleadings in an action alleging negligence arising from a workplace investigation. The court dismissed the claim, holding that the Occupational Health and Safety Act does not create a standalone cause of action for damages and that no tort of negligent investigation exists against employers in Ontario. The motion to add individual officers and directors as defendants was also dismissed due to insufficient particulars.
The Brockville Mental Health Centre v. The Ontario Ministry of Labour
2019 ONSC 3805 (CanLII) · 2019-06-19A provincial offence prosecution involving the Ontario Ministry of Labour and the Brockville Mental Health Centre regarding alleged breaches of the Occupational Health and Safety Act. The case addresses sentencing and appeals related to occupational health and safety offences.
R. v. Wal-Mart Canada Corp.
2017 ONSC 6726 (CanLII) · 2017-11-08Workplace Safety: Hazard in Aisle
This is an appeal regarding a strict liability offence under the Occupational Health and Safety Act where an employee tripped on an empty skid in a workplace aisle. The court addressed whether the placement of the skid constituted a 'hazard or obstruction' under section 11 of Regulation 851 and whether the employer exercised due diligence. The trial judge's interpretation of the legislation was upheld on appeal.
Toronto Standard Condominium Corporation No. 2395 v Wong
2016 ONSC 8000 (CanLII) · 2016-12-20Workplace Harassment: Condominium Injunctive Relief
This is an interlocutory proceeding where a condominium corporation sought injunctive relief and declaratory orders against a unit owner for conduct characterized by threats and intimidation towards condominium personnel. The court addressed whether the respondent's actions constituted workplace harassment under the Occupational Health and Safety Act and violated condominium rules regarding quiet enjoyment. The application also involved procedural matters regarding mental examinations and substituted service.
Rainy River v Olsen
2016 ONSC 8009 (CanLII) · 2016-12-20Workplace Harassment: Injunction Dismissed for Non-Employee Conduct
This interlocutory proceeding addressed whether the respondent's conduct triggered the town's workplace harassment policy under the Occupational Health and Safety Act and warranted an injunction. The court interpreted the statutory definitions of 'worker' and 'workplace' to determine if the Act applied to harassment by non-employees. The application for an injunction was dismissed due to insufficient evidence of irreparable harm or ongoing interference with municipal property.
R. v. Canada Brick Ltd.
2005 CanLII 24925 (ON SC) · 2005-06-30This is a criminal prosecution of an employer under the Occupational Health and Safety Act for failing to protect workers from injury by unguarded machinery. The case addresses the due diligence defence, the foreseeability of hazards, and a Charter challenge regarding warrantless inspections by Ministry of Labour inspectors.
Ontario (Ministry of Labour) v. Walters
2004 CanLII 55057 (ON SC) · 2004-12-06OHSA Supervisor Conviction: $500 Fine Upheld
An appeal regarding a conviction under the Occupational Health and Safety Act for failing to take reasonable precautions for worker safety. The court addressed whether the appellant qualified as a 'supervisor' under the Act and upheld a $500 fine, emphasizing general deterrence and the broad interpretation of supervisory duties to promote worker safety.
R. v. Timminco Ltd.
1999 CanLII 15064 (ON SC) · 1999-04-26A criminal prosecution of a corporation for offences under the Occupational Health and Safety Act, specifically regarding strict liability offences and compliance with Regulation 854.
Gower v. Glen Woollen Mills, Ltd.
1912 CanLII 383 (ON SC) · 1912-12-13This is a workplace injury case involving a factory employee injured while replacing a belt on an elevator pulley. The court addressed employer liability for unsafe machinery and defective workplace systems under the Ontario Factories Act and common law negligence, while also considering defences of contributory negligence and voluntary assumption of risk.