Legionella Risk Assessment is a tool used to identify risk factors in a facility and determine interventions for controlling risks of Legionnaires’ disease, a pneumonia-like illness caused by the waterborne pathogen, Legionella. This information will help employers and those with responsibility for the control of premises, including landlords, understand what their duties are and how to comply with health and safety law.  It applies to premises controlled in connection with a trade, business or other undertaking where water is stored or used, and where there is a means of creating and transmitting breathable water droplets (aerosols), thus causing a reasonably foreseeable risk of exposure to legionella bacteria.