Chemical Sheet No 3 The Control of Major Accident Hazards Regulations 1999

(COMAH) are the most far-reaching set of regulations to apply to 'major hazard ' premises for many years. This sheet provides information to those who control the operation of establishments where COMAH applies referred to as operators in the regulations. It explains the requirement for ‘lower-tier ’ establishments to prepare and keep a major accident prevention policy document, or MAPP document for short. Such a document sets out your policy with respect to the prevention of major accidents. COMAH applies to establishments where specified quantities of dangerous substances are present, or likely to be present. This includes sites where dangerous substances might be generated due to the loss of control of an industrial chemical process. The COMAH Regulations include lists of specified quantities of dangerous substances which are used to determine whether an establishment is top or lower tier. Some of the duties imposed by COMAH do not apply to lower-tier establishments. The HSE publication L111 A guide to the Control of Major Accident Hazards Regulations 1999 will help you decide if the Regulations apply, and whether your establishment is top tier or lower tier. The reference list at the end of the information sheet includes full details of this guide, together with other publications on COMAH. The COMAH Regulations are enforced by a Competent Authority made up of the Health and Safety Executive (HSE) acting jointly with either the Environment Agenc