How to Prevent Legionellosis


What Can I Do to Make Hot Water Safe in My Home?

3 Rules to Prevent Legionellosis


  1. Flush stagnant water

Why? If you have not used hot water for 2 weeks or more, it may become stagnant in your home`s pipes and with inadequate circulation or lukewarm temperature may lead to the development of Legionella.

Water should be flushed from all the outlets in your home to achieve suitable temperatures: open all hot water taps/showers in the house and allow water to run for 5 minutes


  1. Clean shower heads and taps regularly

Why? Over time, taps and showerheads become 'clogged', i.e. limescale or sediment build up in taps and showerheads creating a breeding ground for Legionella.

It is recommended to clean shower heads and taps at least once a month.


  1. Maintain proper water temperature

Why? To prevent the water from reaching a temperature suitable for Legionella growth.

Hot water should always be hot enough, i.e. at least 50 °C, and cold water should always be below 20 °C in your pipe system, a temperature that makes it difficult to hold your hand underneath because of heat or cold respectively.



GUIDELINES FOR BUILDING MANAGERS, HEATING ENGINEERS AND RESIDENTS ON HOW TO CARRY OUT THERMAL DISINFECTION CORRECTLY. It is recommended to conduct the cleaning and thermal disinfection of hot water systems when they are put into operation after a break of more than one month, following reconstruction or repair of the water supply system, or in response to a diagnosis of Legionellosis among consumers. Disinfection can be achieved through either thermal or chemical means.


Last updated: 29-03-2024