In Ontario, when representing a buyer, what must an agent disclose about properties that have environmental contamination?

Option A: Only if the contamination is visible during showings

This option incorrectly limits disclosure to only visible contamination. Environmental contamination often exists below ground or within building materials without visible signs. Agents must disclose known environmental issues regardless of visibility, as contamination can be documented through environmental reports, historical records, or previous disclosures while remaining invisible during property showings.

Option C: Nothing, as environmental reports are the buyer's responsibility

This option incorrectly suggests agents have no disclosure obligation regarding environmental issues. While buyers may obtain independent environmental assessments, this doesn't absolve agents of their duty to disclose known material facts. TRESA and professional standards clearly require disclosure of any known environmental contamination that could materially affect the buyer's decision, regardless of the buyer's independent due diligence responsibilities.

Option D: Only contamination that occurred in the last five years

This option arbitrarily limits disclosure to contamination from the last five years. Environmental contamination can persist for decades and remain material regardless of when it occurred. Historical contamination from industrial use, underground storage tanks, or hazardous materials can still significantly impact property value, development potential, and safety, making the timing of contamination irrelevant to disclosure obligations.