Brunei: DIO - Water Flushing Regime to reduce Legionella Growth

What is water flushing?

Water flushing is a method undertaken to prevent the build-up of conditions favourable to the growth of Legionella and other bacteria within hot and cold water systems. It does this by:

• Introducing fresh cold water containing residual disinfectant
• Exposing pipework to temperatures at which Legionella bacteria is discouraged
• Dislodging biofilm through the simple act of running water

A water flushing regime should be designed so that it allows for the whole dead-leg (section of stagnant water) to be removed.

The water should be purged long enough for circulating or freshwater to be drawn from the outlet - indicating that all stagnant water has been expelled.

Water Flushing Regime to reduce Legionella Growth.

• Water flushing needs to be conducted once a week for any low use water outlets. These consist of outlets within empty quarters/buildings or low use facilities that have water outlets within them.
• Water flushing takes a minimum of 5 minutes for cold and/or hot water outlets.
• Water outlets consist of anything that produces water – kitchen/bathroom/basin/garden taps, showers, hoses etc.
• Building Custodians are required to keep a record of what outlets have been flushed and when, to prove that flushing has been conducted.

Water Flushing record log.

The table below is an example flushing record log:

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Legionella Awareness

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Legionella Prevention

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Information provided by Brunei HIVE.