Environmental guidance for your business in Northern Ireland & Scotland

COMAH regulated site responsibilities

COMAH site responsibilities

If you operate a site covered by the Control of Major Accident Hazard (COMAH) Regulations, you must:

If there are any significant changes to the information you provided in your notification you must tell the HSENI or HSE immediately. You must also tell them if your site closes, or if any part of the site closes where dangerous substances are handled, produced, used or stored.

All COMAH sites must send a new notification to the competent authority by 1 June 2016.

Further information

Contact your environmental regulator


HSENI: COMAH Guidance for Northern Ireland

HSENI: Guidance on preparing safety reports

HSE: COMAH - Safety reports

In this Guideline

Who COMAH applies to

COMAH regulated site responsibilities

COMAH environmental legislation

Environmental News Blog

NetRegs on NetRegs on youTube

View our latest videos & subscribe to our channel.

NetRegs Update Newsletter

Free monthly email newsletter with environmental updates for Northern Ireland and Scotland

Sign up for free today!


NIEA - Apply online

SEPA - Application forms