FIRST AID KIT AND TRAINING REQUIREMENTS FOR ONTARIO CONSTRUCTION SITES

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When someone gets hurt on a construction site, the first few minutes matter more than anything that comes after. A properly stocked first aid kit, a trained first aider who knows what to do, and a clear plan for getting the injured worker to medical care — these are not luxuries. They are legal requirements under Ontario law, and they exist because they save lives.

Ontario Regulation 1101 under the Workplace Safety and Insurance Act sets out the specific first aid requirements for every workplace in the province, including construction sites. The requirements scale with the number of workers on site, and they cover everything from kit contents to the number of trained personnel to the physical setup of a first aid station.

How Many Trained First Aiders Do You Need?

The number of workers with valid first aid certificates required on a construction site depends on the total number of workers present during a shift. Ontario Regulation 1101 breaks it down as follows:

• 1 to 5 workers — a first aid kit is required, but there is no mandatory requirement for a trained first aider (though it is strongly recommended)
• 6 to 15 workers — at least one worker must hold a valid Standard First Aid certificate from a WSIB-approved training provider
• 16 to 200 workers — at least one worker per shift must hold a valid Standard First Aid certificate, and a first aid room is required
• More than 200 workers — at least one trained first aider for every 100 workers per shift, plus a dedicated first aid room staffed by a qualified first aid attendant

The trained first aider must be readily available during all working hours. That means they cannot be working at the far end of a large site or in a location where they cannot be quickly reached. On multi-storey projects or large-footprint sites, consider positioning trained first aiders on different levels or areas.

First Aid Kit Contents — What the Regulation Requires

Ontario Regulation 1101 specifies the minimum contents for first aid kits based on the number of workers. There are different kit types, and the regulation is specific about quantities.

Small Kit (1 to 5 Workers)

• 1 card of safety pins
• 1 x 1-inch adhesive bandage roll
• 16 individually wrapped sterile adhesive dressings
• 1 x 4-inch sterile gauze pad
• 1 roll of 2-inch gauze bandage
• 1 triangular bandage (40-inch)
• 1 pair of scissors
• 1 resuscitation pocket mask with one-way valve

Medium Kit (6 to 15 Workers)

Includes all small kit contents plus additional quantities of bandages, dressings, and gauze, as well as:

• 24 individually wrapped sterile adhesive dressings
• 4 x 4-inch sterile gauze pads
• 2 rolls of 2-inch gauze bandage
• 2 triangular bandages
• 2 sterile surgical pads (pressure dressings)
• Splints (assorted sizes)
• 2 rolls of adhesive tape (1 inch)

Large Kit (16 to 200 Workers)

Includes expanded quantities of all items above, plus additional wound dressings, eye wash solution, blankets, and a stretcher. At this level, a dedicated first aid room is also required.

Every kit must be clearly marked with a white cross on a green background and be stored in a location that is easily accessible and known to all workers. Kits must be inspected regularly, and any used or expired items must be replaced immediately.

First Aid Room Requirements

When a construction project has 16 or more workers regularly employed, the employer must provide a first aid room or station. The regulation specifies that this space must include:

• A clean, well-lit room — heated, ventilated, and large enough to accommodate a stretcher and a first aid attendant working on a patient
• A first aid kit — stocked to the level required by the worker count
• A stretcher and two blankets
• A sink with hot and cold running water (where reasonably practicable)
• A record book — for documenting all first aid treatments administered
• Emergency contact information — posted prominently, including the nearest hospital, ambulance service number, and poison control

On construction sites where a permanent room is not feasible, a first aid station in a dedicated trailer or site office can meet the requirement, provided it has the required supplies and amenities.

Posting Requirements

Ontario Regulation 1101 requires that specific information be posted in a conspicuous location visible to all workers. This includes:

• The WSIB's "In Case of Injury" poster (Form 82) — this outlines the steps a worker must take after a workplace injury and is a mandatory posting in every Ontario workplace
• The name and location of the trained first aider(s) — workers need to know who to go to and where to find them
• The location of the first aid kit and first aid room
• Emergency telephone numbers — ambulance, hospital, poison control, and the employer's emergency contact
• Directions to the nearest hospital — especially important on remote construction sites or sites in unfamiliar areas

On a busy construction site with workers from multiple trades and employers, it is easy for this information to get buried under safety data sheets and other postings. Make sure it is current, legible, and prominently displayed at the site entrance and in the lunch area.

Record Keeping

Every first aid treatment administered on site must be recorded. The first aid record book should capture:

• Date and time of the injury or illness
• Name of the injured worker
• Nature of the injury or illness
• First aid treatment provided
• Name of the first aider who provided treatment
• Whether the worker was referred for medical treatment

These records serve multiple purposes. They document the employer's compliance with the regulation, provide evidence for WSIB claims, and — critically — they help identify patterns. If you notice three soft-tissue injuries from the same task in two weeks, that is a signal that the task or the equipment needs to be re-evaluated before something worse happens.

First Aid Training — What Qualifies?

First aid training must be provided by a WSIB-approved training provider. The most common certifications for construction sites are:

• Standard First Aid with CPR Level C and AED — this is the certificate most commonly required under Reg. 1101 for construction. It covers wound care, fractures, burns, choking, anaphylaxis, cardiac emergencies, and the use of an automated external defibrillator.
• Emergency First Aid with CPR Level A — a shorter course covering basic life-threatening emergencies. Acceptable for smaller workplaces but Standard First Aid is preferred for construction due to the higher risk of serious injury.

Certificates are valid for three years. The employer is responsible for ensuring that first aiders maintain current certification and for scheduling recertification before certificates expire.

Common Compliance Gaps on Construction Sites

Ministry inspectors frequently find first aid violations on construction projects. The most common issues include:

• Expired or incomplete kits — bandages used and not replaced, items past their expiry date, or kits that were never stocked to the correct level for the worker count
• No trained first aider on site — the designated first aider called in sick and no replacement was arranged
• Kit location unknown — workers cannot identify where the first aid kit is located because no one told them and there is no signage
• No record book — treatments are administered but never documented
• Missing or outdated postings — the Form 82 poster is missing, or the emergency contact numbers are for a previous project

These are straightforward compliance items that take minimal effort to get right. A weekly first aid kit inspection — just opening the kit and checking contents against the regulation's list — takes five minutes and prevents an order from an inspector.

When in Doubt, Over-Prepare

Regulation 1101 sets the minimum standard. On a construction site, where lacerations, crush injuries, falls, and burns are daily possibilities, the minimum should be your starting point, not your ceiling. Consider adding AEDs to your site even when not strictly required, training more first aiders than the regulation demands, and keeping your kits stocked above the minimum quantities.

The cost of a well-stocked first aid program is negligible compared to the cost of a single serious injury where treatment was delayed because the nearest trained first aider was a 10-minute walk away or the kit was missing a pressure dressing.