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Legionella is a naturally occurring bacteria that causes Legionnaire’s Disease, a lung infection you can get from inhaling contaminated droplets of water from things like air conditioning or hot tubs.
Legionella is found in all water systems – both natural and man-made. It thrives in warm temperatures and low oxygen levels and is commonly found in the water supply of old public buildings.
It is important to regularly check and test these systems to ensure that they’re safe.
But how regularly? How long does legionella take to develop?
Quicker than you think
Legionella can develop in a stagnant water system in just a few days. This alarmingly short time span means that public buildings and workplaces must be very aware of the dangers associated with not regularly monitoring water systems.
If the water temperature is between 20°C and 45°C and isn’t flowing, that is the optimum environment for bacteria growth. Once it has developed it will quickly multiply.
However, if hot water is kept above 60°C and cold water is stored at less than 20°C then it is harder for legionella to thrive.
The exact amount of time it takes for legionella to grow and reproduce also depends upon the water chemistry, what nutrients are already present, and if there are other bacteria in there fighting for space.
Prevention
Most water systems are designed and monitored to avoid any legionella growth.
We would recommend you flush, clean and disinfect all systems at least once a week to prevent legionella from being able to grow. Particularly if those systems are only used occasionally.
Also, if you’re not using a particular tap, toilet or shower weekly, ensure that when you do use it, you allow it to run for a few minutes with a window open beforehand.
Storage tanks should be checked regularly for any corrosion or contamination and pipe work should be as direct as possible to avoid any stagnant water.
Showerheads and hoses should be descaled and deep cleaned at least once a quarter.
Legionnaire’s Disease
If you do think you’ve been exposed to legionella bacteria, look out for symptoms of Legionnaire’s Disease which can start with headache, muscle ache and fever as soon as two to 10 days after.
Other symptoms include cough, chest pain, shortness of breath and confusion. It is vital to see a doctor quickly and share your concerns in order to prevent serious complications. Without treatment, Legionnaire’s Disease can be hugely dangerous and sometimes fatal.
For more advice on legionella and legionella risk assessments, contact our team on 01604 936508 or info@acornsafetyservices.co.uk. You can also obtain a quote here.
