As heat risks continue to rise across Ontario workplaces, many employers are uncertain when a formal heat stress assessment is necessary. This guide explains key indicators, regulatory expectations, and how early assessment can help reduce risk, improve worker safety, and demonstrate due diligence.

Rising temperatures continue to increase the risk of heat-related illness in Ontario workplaces, particularly in environments where physical exertion, protective clothing, or outdoor work are involved. Heat stress does not only affect worker health; it can also impact productivity, decision-making, and incident risk.

Many employers are unsure when a heat stress assessment is required or how to determine whether existing controls are sufficient. This guide outlines when a heat stress assessment should be considered and how a proactive approach can support worker safety and regulatory compliance.

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