A Legionella risk assessment is a site-specific document that details the findings of an examination of the entire water system within the premises. The primary purpose is to identify if there are any parts of the system that might support or enable the growth of the Legionella bacteria and therefore present a risk to building users.
The assessment takes into account the following factors:
The risk assessment should be reviewed regularly and whenever there is reason to believe the original assessment may no longer be valid, for example:
The following areas would be investigated:
The purpose of the risk assessment is to evaluate the plant, equipment, operational and management of the building systems and their risk of bacteriological proliferation.
The risk assessment would include all hot and cold-water services, which will incorporate an assessment of the design, usage and condition. All information would be recorded on pro-forma forms and collated within a single comprehensive document [supplied in electronic format].
Temperature measurements would be completed, checked and evaluated. The following standards should be met:
Where hot water is discharged at more than 50oC and there is a risk of scalding the risk assessment should identify the need for thermostatic mixing valves or other forms of temperature control.
Any areas requiring remedial action would be covered in the recommendations.