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Advice on changes to ACoP L8

All employers have an obligation to minimise the risk of exposure to Legionella and conform to The Approved Code of Practice L8 “The Control of Legionella (Bacteria in Water Systems)”. The code was revised in November 2013; this is our summary of the key changes and how they affect employers and building owners.


  • Advice on changes to ACoP L8

    All employers have an obligation to minimise the risk of exposure to Legionella and conform to The Approved Code of Practice L8 “The Control of Legionella (Bacteria in Water Systems)”. The code was revised in November 2013; this is our summary of the key changes and how they affect employers and building owners.

    The fourth edition of the ACOP and guidance on regulations published on 25th November 2013 contains revisions to simplify and clarify the text from previous editions.

    The new edition is in two parts:

    • The revised ACoP L8
    • Technical Guidance HSG 274

    The technical guidance is now is three sections

    • The control of Legionella bacteria in evaporative cooling systems.
    • The control of Legionella bacteria in domestic hot and cold water systems (interim document copied from version 3 of L8). New guidance now out for consultation and due for publication in March 2014
    • The control of Legionella bacteria in other risk systems

    The following issues have now been given ACOP status:

    • risk assessment
    • the specific role of an appointed competent person, known as the ‘responsible person’
    • the control scheme
    • review of control measures
    • duties and responsibilities of those involved in the supply of water systems

    For most building owners with effective systems in place the revisions will not necessitate much change. Key implications of the L8 amendments are:

    • Risk assessments are now considered live documents and should be regularly reviewed rather than a new assessment being undertaken every 2 years as before.
    • In low risk systems there is provision for a lower level risk assessment.
    • There is an increased level of knowledge deemed necessary for the duty holder.
    • The importance of good communication is emphasised throughout the document.

    If you would like further advice on how the changes may affect you, please contact us.


  • Safe Contractor Approved Legionella Control Association