The COMAH Regulations implement the Seveso II Directive except for the land-use planning requirements which are implemented by changes to planning legislation. They replaced the Control of Industrial Major Accident Hazards Regulations 1984 (COMAH) and came into force on 1st April 1999. The Regulations are amended from 30 June 2005 to reflect changes to Seveso II. Their main aim is to prevent and mitigate the effects of those major accidents involving dangerous substances, such as chlorine, liquefied petroleum gas, explosives, and arsenic pentoxide which can cause serious damage/harm to people and/or the environment. The COMAH Regulations treat risks to the environment as seriously as those to people.

Full details of the COMAH regulations and how they are applied to our sector can be found on the HSE website as follows: