What is legionella risk assessment is a bacteria that can cause a type of pneumonia called Legionnaires’ disease. It is found in natural water sources such as rivers and lakes but can also be present in man-made water systems, like those used in buildings and facilities, under certain circumstances.

In the UK it is a legal requirement that anyone who is responsible for managing a building or facility (the legionella responsible person or duty holder) must identify and assess the risks of exposure to Legionella in water systems and take suitable control measures to minimise those risks. This is reflected in primary health and safety legislation such as the Health and Safety at Work etc Act 1974 and the Management of Health and Safety Regulations 1999, as well as the HSE’s Approved Code of Practice L8 “Legionnaires’ disease: The control of Legionella bacteria in water systems” and supporting Health and Safety Guidance HSG 274.

Exploring Legionella Risk Assessment: Purpose and Process

A risk assessment should be carried out by a suitably qualified professional who has experience and knowledge of the issues and regulations surrounding water safety, and who can provide detailed advice and guidance on how to manage the risks. Typically this will include a review of the building or facility, including its layout and the water systems that are in use. It will then involve the collection of water samples and testing for the presence of Legionella in those samples. The assessment will then include a report on the findings and recommendations on how to manage any risks identified.