Workplace Safety Rules for Ontario Small Businesses

OHSA basics every Ontario employer must know

The Occupational Health and Safety Act (OHSA) is Ontario's primary workplace safety legislation. It creates a duty on every employer to take every precaution reasonable in the circumstances for the protection of a worker. That duty is not qualified by the size of your business. A sole proprietor with one employee has the same general duty as a 500-person manufacturer.

The OHSA also establishes specific internal responsibility obligations that scale with workforce size:

• 5 or fewer workers: No formal committee or representative required, but the general duty to maintain a safe workplace still applies.
• 6 to 19 workers: A health and safety representative must be selected from among workers who are not managers or supervisors. This person performs workplace inspections and raises safety concerns.
• 20 or more workers: A Joint Health and Safety Committee (JHSC) is required. The committee must have at least two members, with at least one worker representative and one management representative. JHSC members must complete a two-part, Ministry-approved certification course.

Workers have the right to refuse unsafe work under the OHSA. If a worker refuses a task they believe is dangerous, you cannot discipline them for that refusal, you must investigate. Understanding this right in advance, and having a process for responding to it, is far less costly than learning about it during a Ministry of Labour inspection.

WHMIS 2015: what it covers and when it applies

The Workplace Hazardous Materials Information System (WHMIS) is a national standard governing hazardous products in Canadian workplaces. Ontario implements WHMIS through the Occupational Health and Safety Act and Regulation 860. The current version, WHMIS 2015, aligns with the Globally Harmonized System (GHS) of classification and labelling.

WHMIS applies whenever a hazardous product is present in your workplace. The scope is broad: commercial cleaning products, disinfectants, compressed gases, solvents, adhesives, and many other common products qualify. If you use any of these, WHMIS training is mandatory for workers who work with or near the product.

Your obligations as an employer:

• Maintain a Safety Data Sheet (SDS) for every hazardous product used in the workplace. These are provided by suppliers and must be accessible to workers in the work area.
• Ensure all hazardous products are properly labelled. Supplier labels must include the product name, hazard pictograms, signal word (Danger or Warning), and hazard statements.
• Train workers on WHMIS. Training must cover how to read labels and SDS documents, the hazards of specific products they work with, and safe handling and emergency procedures.
• Update training when new hazardous products are introduced, or when new hazard information becomes available.

WHMIS training does not require a specific course length or provider, it can be done in-house. However, you must document that training was completed, who completed it, and when. Online WHMIS 2015 courses cost roughly $20–$40 per employee and generate a certificate that serves as documentation.

What to do when an incident happens

Every Ontario employer should have a clear internal incident response process documented before they need it. When an injury or near-miss occurs, the sequence matters.

1. Secure the scene and provide first aid. Your first obligation is to the injured worker. Call 911 for emergencies. Secure the area to prevent further injury.
2. Preserve the scene. Under the OHSA, the scene of a critical injury or fatality must not be disturbed except to assist the injured worker or prevent further injury. Premature cleanup can be an OHSA violation. Photograph the scene before anything is moved.
3. Internal notification. Notify the supervisor and, where applicable, the health and safety representative or JHSC. Document the details: who, what, where, when, and what conditions existed at the time.
4. Ministry of Labour notification. A critical injury (as defined in Ontario Regulation 834) must be reported to the Ministry of Labour, Immigration, Training and Skills Development immediately by telephone, followed by a written report within 48 hours. A fatality must also be reported immediately. Failing to report is a separate offence under the OHSA.
5. Conduct an investigation. Every critical injury must be investigated. Even for minor incidents and near-misses, a documented investigation is best practice, it demonstrates due diligence and identifies the root cause so it does not recur.

Ontario's Ministry of Labour has published the definition of "critical injury" under Ontario Regulation 834. It includes injuries that place life at risk, produce unconsciousness, result in substantial blood loss, involve fractures, or cause loss of a body part. When in doubt, report.

Workplace safety program for small teams

A "workplace safety program" sounds intimidating for a small business, but the core components are straightforward. What matters is documentation, the existence of written policies and training records is your primary defence in an OHSA inspection or a WSIB claim dispute.

For a small Ontario business, the minimum viable safety program includes:

• A written health and safety policy. Ontario law requires every employer with 6 or more workers to have a written occupational health and safety policy. The policy must be reviewed annually. It does not need to be lengthy, a one-page statement of your commitment and general responsibilities is sufficient.
• Documented training records. For every piece of safety training, WHMIS, forklift, ladder safety, emergency procedures, maintain a signed record listing the worker's name, the training content, and the date. A simple spreadsheet works.
• Regular workplace inspections. The health and safety rep (for businesses with 6–19 workers) must conduct monthly inspections. Even for smaller businesses, a brief walkthrough of the workplace once a month, documented with date, who conducted it, and any issues found, demonstrates active management of safety.
• Emergency procedures posted. Fire evacuation routes, the location of first aid kits, and emergency contact numbers must be clearly posted and communicated to all workers.

The Ministry of Labour's Health and Safety Associations (such as Workplace Safety & Prevention Services for agriculture and manufacturing, or Infrastructure Health & Safety Association for construction) offer free or subsidized resources for small business owners building these programs from scratch.

Common OHSA violations at SMBs and how to avoid them

Ministry of Labour inspectors who visit small Ontario workplaces consistently find the same categories of violations. Knowing the common ones is the cheapest form of risk management.

• Missing or inaccessible Safety Data Sheets. If you use any hazardous product, even common cleaning products, and you cannot produce the SDS for that product during an inspection, it is a violation. Maintain a binder or digital folder of SDS documents for every hazardous product on-site, updated whenever you bring in a new product.
• No health and safety committee or representative when required. If you have 6 or more workers, the OHSA requires a health and safety rep or committee. Not having one, or having one that has not conducted inspections, is a common finding on inspection reports. The fix is simple: designate someone, document their appointment, and have them start conducting monthly walkthroughs.
• No documented training. Having trained your workers verbally or informally does not satisfy the OHSA requirement. Training must be documented. If an inspector asks for records of WHMIS training or equipment training and you cannot produce them, you are at risk regardless of whether training actually happened.
• No written health and safety policy (6+ workers). Required by law for businesses with 6 or more workers. One of the easiest fixes on this list.
• Blocking emergency exits or inadequate first aid supplies. First aid kit contents must meet Ontario Regulation 1101 minimums based on number of workers. Exits must be unobstructed and clearly marked. Both are inspected routinely.

For related employer compliance topics, see our guides on Ontario employment standards for small business and workplace harassment policy requirements.

Frequently asked questions