Major Hazard Installation Duty Holders: key timelines to monitor to ensure compliance with new regulations

22nd September 2023

Major Hazard Installation Duty Holders: key timelines to monitor to ensure compliance with new regulations

Regulations to the Occupational Health and Safety Act that apply to major hazard installations require that certain actions be taken to manage health and safety risks – some with timelines for compliance that must be monitored.

Amended regulations regulating Major Hazard Installations (MHI) under the Occupational Health and Safety Act (OHSA) were promulgated in January 2023. They apply to MHI establishments with the prescribed quantities of listed substances and major pipeline establishments. They require the duty holder (the employer, self-employed person, a user or pipeline operator who is in control of an establishment) to take steps to manage health and safety risks, some of which are in addition to the measures required under the 2001 regulations. In respect of existing establishment, timelines for compliance with some of these new obligations have been set out. 

To comply fully with the MHI regulations, duty holders should have assessed and determined whether the MHI or major pipeline establishment is a low, medium, or high-hazard establishment. 

Although the MHI regulations came into effect in January 2023, certain extended time periods were provided for duty holders to achieve specific regulatory compliance. 

The following timelines should be borne in mind when existing MHI establishments are under the control of employers: 

Current obligations for which there are no transitional time periods include: 

Written by Kate Collier, Partner at Webber Wentzel