It is essential to have a written scheme of control in place that identifies the risks, the control measures that need to be implemented, and the responsibilities of the people involved.
Regular sampling and testing of water systems for the presence of Legionella is essential to ensure that control measures are effective. This involves taking samples of water from different points in the system and testing them for the presence of Legionella.
Regular flushing of water systems is essential to remove stagnant water, which can be a breeding ground for Legionella. This is particularly important where dead legs exist in a water system.
Regular checks of water temperatures are essential to ensure that they remain within safe limits. Cold water should be kept below 20°C, and hot water should be kept above 50°C.