This guideline aims to increase awareness about the hazards associated with legionella, improve the management of potential sources of legionella and improve the reporting and investigation of cases of legionellosis.
It provides up-to-date information, advice and guidance for minimising the risk of significant contamination in waters of cooling towers and cold and heated water distribution systems.
It is intended to assist all those concerned with legionella, including public health service providers, territorial local authorities, building owners, air conditioning engineers, employers and others dealing with maintenance of buildings.
July 2019 - In July 2019, the advice on microbiological testing (page 33) was clarified.
October 2012 - In October 2012 minor amendments were made to the document to ensure it is consistent with the Ministry of Health's Communicable Disease Control Manual 2012. Other minor amendments also recognise that on 1 July 2012 the functions of the former Department of Building and Housing and Department of Labour were integrated into the Ministry of Business, Innovation and Employment.