The legionella risk assessment is found in natural water sources but it can also grow and multiply in man-made water systems if certain circumstances are present. When this happens, the bacteria can be released into air and when inhaled by people (either staff or visitors) can cause Legionnaires Disease, which is a potentially fatal form of pneumonia.

It is essential to carry out a risk assessment as it can identify areas where the legionella bacteria may populate and therefore pose a health & safety threat. The assessment will highlight where there are dead legs, areas of stagnant water and any other circumstances that could provide the ideal breeding ground for the bacteria. This information can then be used to put in place control measures and help prevent the bacteria from spreading.

Understanding Legionella Risk Assessment: What You Need to Know

Having a legionella risk assessment is not just a legal requirement, it is also in the best interest of your staff, tenants, customers, and visitors. It is important that the assessment is kept up to date, and routine testing should be carried out regularly – for example, cooling towers and evaporative condensers should be tested quarterly whilst hot and cold water systems are tested monthly.

Although you can undertake a risk assessment yourself, if your site or property is large and complex it may be best to hire a specialist with the knowledge, qualifications and experience in carrying out the assessment. Ideally, the professional you choose will have access to the right equipment and should be covered by professional indemnity insurance.