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Legionnaires’ disease The control of legionella bacteria in water systems

Approved Code of Practice and guidance on regulations

L8 (Fourth edition) Published 2013

This fourth edition of the ACOP and guidance on regulations contains revisions to simplify and clarify the text. The main changes are removing Part 2, the technical guidance, which is published separately as HSG274 at, and giving the following issues ACOP status:


Also Published

The guidance is in three parts:

 Part 1: The control of legionella bacteria in evaporative cooling systems

 Part 2: The control of legionella bacteria in hot and cold water systems - Interim guidance (old guidance only)

 Part 3: The control of legionella bacteria in other risk systems

The complete hard copy edition of HSG274, including revised guidance on hot and cold water systems, and a revised online version of Part 2, will be published in 2014