Legionella is a bacteria that can enter your water supply and cause Legionnaires’ disease if you inhale it.
All hot and cold water systems in your home are potential sources of legionella bacteria growth.
The highest risk occurs when warm water between 20℃ and 50℃ is not flowing and is then spread in places such as shower heads, hose pipes, taps etc.
Bacteria growth is more common where there is something to feed the bacteria – for example, rusty surfaces, sludge or scale build-up in the water system.
- Flush showers and taps for 10 minutes if they haven’t been used in a while – for example, if you have been on holiday or a room is not used regularly.
- Keep all shower heads and taps clean and free from limescale, mould or algae growth.
- If you have a hot water storage system in your home, like an immersion heater or combination water heater, make sure the water is stored at a temperature higher than 60℃, but be aware of scalding.
Notice any rust or unusual matter flowing from your water outlets? Report this repair to us immediately.
If you have a water butt for rainwater collection, the best way to prevent Legionella in the stored water is to place the water butt in the shade. Ideally the water should be stored at less than 20°C. When using the water from the butt, do not use a sprinkler, spray, or hose. Instead, use a watering can, but remove the rose first. You must also clean your water butt annually.
How to clean your water butt
You should keep the lid of your water butt firmly closed to stop debris falling in, and use the water frequently to keep the butt as clean as you can.
It’ll still need annual cleaning to remove algae, sludge and debris. This is best done in the autumn.
Cleaning Steps
- Empty the water butt and drain the tank completely.
- Clean the interior with a coarse brush or sponge, using warm water and a mild, non-antibacterial detergent, or vinegar.
- Rinse the butt thoroughly to remove residue.
- Wash the outside of the butt to remove dirt and stains.
Signs you need to clean the butt more often
- Visible algae growth
- Sludge or debris buildup: a layer of sediment at the bottom means it’s time for a clean!
- Bad looking or smelling water.
Symptoms of Legionnaires’ disease are similar to symptoms of the flu. You can find out more about the symptoms here.
If you suspect that you or someone in your household has contracted Legionnaires’ disease, contact your doctor immediately.
If it is confirmed, please report it to us.