Can Ontario corporate officers face personal liability for environmental harm caused by the corporation?

Yes. Ontario environmental legislation, including the Environmental Protection Act, can impose personal liability on directors and officers of corporations for environmental offences and remediation costs, independently of the corporation's own liability. The legislation typically uses broad language that captures individuals who directed, authorized, assented to, acquiesced in, or participated in the commission of an offence.

Officers in particular — because they manage day-to-day operations — may be directly involved in decisions that lead to discharges, improper handling of contaminants, or violations of environmental permits. Personal liability for remediation costs can be substantial and does not automatically disappear if the corporation is sold, restructured, or becomes insolvent.

There is a due diligence defence available to directors and officers in many environmental statutes. Demonstrating that all reasonable steps were taken to prevent the offence — including ensuring proper training, equipment, reporting systems, and compliance programs were in place — can defeat personal liability even where an offence occurred. However, the defence requires proactive effort: a director or officer who was simply unaware because they did not ask questions will generally not succeed. If your corporation handles hazardous materials, discharges waste, or operates in a regulated environmental context, periodic legal reviews of your compliance program are worthwhile.