Understanding Ontario Regulation 490/09 is key to managing risk in industrial, commercial, and institutional properties. This article outlines employer responsibilities, common designated substances, and how a Designated Substance Survey (DSS) can help ensure compliance, protect workers, and prevent costly project delays.

Managing industrial, commercial, or institutional (ICI) properties in Ontario comes with a legal responsibility obligation under the Occupational Health and Safety Act (OHSA) to protect workers from hazardous material exposures. One of the most significant regulatory requirements for hazardous materials management in Ontario workplaces is Ontario Regulation 490/09 – Designated Substances, enacted under the OHSA.

This regulation establishes strict exposure limits, assessment requirements, and mandatory control programs for 11 substances recognized as posing significant occupational health risks. Employers must determine whether designated substances are present in the workplace and ensure that worker exposure is assessed and controlled in accordance with the regulatory requirements.

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