Complete Designated Substance Survey services in Toronto & the Greater Toronto Area.

A Designated Substance Survey (DSS) is a safety check that helps identify and document hazardous materials inside a building, especially before starting construction, renovation, or demolition work.

The goal of the survey is simple: to protect workers and occupants from harmful substances like asbestos, lead, and silica by making sure they’re properly handled, managed, or removed.

In Ontario, completing a DSS isn’t optional: It’s a legal requirement under the Occupational Health and Safety Act (OHSA).

Why A DSS Matters:

Property owners and employers are required to arrange a DSS for a few key reasons:

It’s the law: Ontario legislation requires owners to disclose any designated substances to contractors during the tendering process.
Health and safety first: A DSS identifies hazardous materials that could put workers or occupants at risk if disturbed, ensuring the right precautions are in place.
Avoid costly setbacks: Skipping a DSS can result in fines, legal issues, Ministry of Labour stop-work orders, and project delays.
Proper disposal: It ensures hazardous waste is handled and disposed of safely and in compliance with regulations.

What Happens During A DSS:

A DSS is carried out by a qualified, certified inspector and usually includes:

Site walkthrough: Inspecting the property for materials likely to contain hazardous substances.
Sampling: Collecting small samples from materials like drywall, flooring, and insulation.
Laboratory testing: Sending samples to an accredited lab to confirm the type and concentration of substances.
Report: Preparing a detailed document showing the locations and concentrations of any designated substances, along with safe handling or removal recommendations.