Designated Substance Survey

A Designated Substance Survey (DSS) is a mandatory, comprehensive inspection of a building or workplace to identify, locate, and quantify 11 specific hazardous materials (e.g., asbestos, lead, silica, mercury) regulated under the Occupational Health and Safety Act. It is essential for protecting workers and occupants during renovation, demolition, or maintenance by ensuring necessary safety precautions are taken. 

Key Aspects of a Designated Substance Survey

• • Purpose: The primary goal is to ensure compliance with health and safety regulations, such as those in Ontario, and to protect people from exposure to dangerous materials.
  • The 11 Designated Substances: The survey typically tests for acrylonitrile, arsenic, asbestos, benzene, coke oven emissions, ethylene oxide, isocyanates, lead, mercury, silica, and vinyl chloride.

• When it is Required: A DSS is required before any construction, renovation, or demolition project to identify risks.

• Process: Qualified professionals inspect the site, collect samples of suspicious materials, and provide a detailed report outlining the location and concentration of any hazardous substances.

• Legal Compliance: Failure to conduct a DSS can result in serious legal consequences, fines, and risks to health. 

Commonly Surveyed Substances in Buildings 

• Asbestos: Commonly found in insulation, floor tiles, and ceiling tiles.
• Lead: Often found in old paint, pipes, and solder.
• Silica: Present in concrete, brick, and mortar.
• Mercury: Found in switches and thermostats. 

A DSS ensures that employers and contractors know exactly what hazards are present, allowing them to take appropriate measures to manage or remove them safely.