CNESST Compliance for Temporary Workers: What Employers Must Know

Using temporary workers through a staffing agency does not eliminate your CNESST obligations. It redistributes them. The agency takes on some responsibilities. You retain others. And a grey zone exists between the two where injuries happen, claims get filed, and both parties discover they were not as covered as they thought.

The Commission des normes, de l'equite, de la sante et de la securite du travail (CNESST) regulates workplace health and safety, labour standards, and workers' compensation in Quebec. If your facility uses temporary staffing — even a single worker for a single shift — CNESST rules apply to your operation.

Here is how the obligations break down.

Who Is the Employer?

In a temporary staffing arrangement, two entities are involved:

• The staffing agency — recruits, hires, and pays the worker. Issues T4s and RL-1s. Remits payroll deductions.
• The client employer — directs the worker's daily tasks, controls the work environment, and supervises performance.

Under Quebec's Act Respecting Occupational Health and Safety (LSST), the employer responsible for a worker's safety is the entity that has effective control over the work and the workplace. In most temporary staffing arrangements, that is the client employer — you.

The staffing agency is the employer of record for payroll and benefits purposes. But for health and safety purposes, CNESST treats the client employer as having primary responsibility for the conditions the worker operates in.

This dual-employer structure is where most confusion — and most compliance failures — originate.

Workers' Compensation Coverage

Who Carries the Policy?

The staffing agency registers with CNESST and pays workers' compensation premiums based on the classification of the work their employees perform. A worker assigned to warehouse duties is classified under the warehouse unit rate, not the agency's office rate.

This is critical. Some agencies register under a general office classification and pay a lower premium rate, then assign workers to industrial environments that carry higher risk and higher rates. If an injury occurs, CNESST may reclassify the agency retroactively and assess penalties. The injured worker is still covered, but the agency's financial exposure increases — and in severe cases, CNESST may look to the client employer to share the premium burden.

Verify the Agency's Coverage

Before engaging a staffing agency, request:

1. CNESST registration number — confirm it is active
2. Industry classification unit rate — confirm it matches the work being performed at your facility
3. Good standing confirmation — the agency should be current on premium payments

If the agency cannot provide this documentation, do not proceed. An unregistered or improperly classified agency creates direct liability for you.

Impact on Your Experience Rate

In Quebec, CNESST premiums for employers with payrolls above approximately $500,000 are experience-rated — your premium rate is adjusted based on your claims history. A legitimate question: does a temporary worker's injury at your facility affect your experience rate?

The general rule is that the staffing agency's experience rate absorbs the claim, since the agency is the employer of record. However, CNESST has the authority to impute costs to the client employer if the injury resulted from the client employer's failure to provide a safe work environment.

If a temporary worker is injured because of a machine guard you failed to maintain, or a fall hazard you knew about but did not address, CNESST can assign all or part of that claim cost to your account. The agency's coverage does not shield you from your own negligence.

Health and Safety Obligations

Client Employer Obligations

As the entity controlling the workplace, you must provide temporary workers with the same protections you provide permanent employees:

• Hazard identification and communication — temporary workers must be informed of all known hazards in the areas where they will work
• Safety training — site-specific training covering emergency procedures, PPE requirements, equipment operation, and hazard-specific protocols
• Personal protective equipment — if the role requires PPE, you must provide it or verify that the worker has appropriate PPE before they begin work
• Supervision — temporary workers must receive the same quality of supervision as permanent employees. "They are the agency's worker, not mine" is not a defense when an unsupervised temp worker is injured on your floor
• Right to refuse — temporary workers have the same right to refuse dangerous work as permanent employees under Section 12 of the LSST. You cannot penalize a temporary worker for exercising this right, and you cannot ask the agency to replace them for doing so

Staffing Agency Obligations

The agency must:

• Provide general safety training before dispatching the worker — WHMIS, general PPE use, right-to-refuse awareness, incident reporting procedures
• Inform the worker of known hazards at the client site (which means the agency must know those hazards — see the site visit discussion below)
• Conduct site assessments — under best practices and CNESST expectations, the agency should visit the client facility to understand the work environment before placing workers
• Maintain documentation — training records, site assessment records, incident reports

The Gap

The compliance gap occurs when each party assumes the other is handling safety training. The agency believes the client will train the worker on-site. The client believes the agency already trained the worker before dispatch. The worker receives no meaningful training from either party and is expected to perform from the first hour.

This is the scenario that produces injuries. Close the gap by:

1. Defining in writing which party is responsible for which training elements
2. Having the temporary worker sign a training acknowledgment on their first day at your site
3. Not allowing the worker to begin productive work until all training is documented as complete

Reporting Obligations

Workplace Injuries

When a temporary worker is injured at your facility:

1. Provide first aid immediately — same as for any worker
2. Report the incident to the staffing agency, since they are the employer of record and must file the CNESST claim
3. Complete your internal incident investigation — document what happened, where, and why
4. Cooperate with the agency's claim filing — provide witness statements, photos, and investigation findings

The agency files the workers' compensation claim with CNESST. However, CNESST inspectors may visit your facility to investigate the cause. If the investigation reveals a health and safety deficiency at your site, the resulting order (notice of violation or stop-work order) is issued to you, not the agency.

Inspections

CNESST inspectors can visit any workplace at any time. The presence of temporary workers on your site does not change this. If an inspector asks about training records for temporary workers, you need to produce them. If they ask about the temporary worker's safety orientation, you need to demonstrate it occurred.

"The agency handles that" is not an answer a CNESST inspector will accept for conditions at your facility.

Practical Compliance Steps

Before the First Worker Arrives

1. Verify agency registration and classification with CNESST
2. Conduct a joint site assessment — invite the agency to walk your facility and identify hazards relevant to the roles they will fill
3. Define training responsibilities in the service agreement — specify what the agency trains, what you train, and how completion is documented
4. Prepare a site-specific orientation package for temporary workers — hazard communication, emergency procedures, PPE requirements, and supervisor contact information

On Day One

5. Deliver the site orientation before the worker begins any productive task
6. Issue and document PPE provided
7. Assign a supervisor or buddy who is responsible for the worker during the first shift
8. Have the worker sign a training acknowledgment

Ongoing

9. Include temporary workers in safety meetings and toolbox talks — they face the same hazards as permanent staff
10. Report near-misses and incidents involving temporary workers through the same channels as permanent employee incidents
11. Review the arrangement quarterly — are training records current? Has the agency's CNESST registration been renewed? Have site hazards changed?

The Cost of Non-Compliance

CNESST penalties for health and safety violations range from $1,000 to $300,000 per offense depending on severity, and can be assessed against both the client employer and the staffing agency. Repeat violations carry higher penalties. A fatality investigation that reveals systemic training failures can result in criminal charges under the Criminal Code of Canada.

The financial exposure from a single serious injury to a temporary worker — combining workers' compensation costs, CNESST penalties, legal fees, and operational disruption — routinely exceeds $100,000. The cost of doing it right — verifying coverage, defining training responsibilities, and delivering proper orientations — is negligible by comparison.

Temporary workers are temporary in assignment, not in their right to a safe workplace. CNESST does not distinguish. Neither should you.