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Interruption to your water supply - Harpenden - AL4 & AL5

Friday 29 May 2020

Update - Sunday 31 May 2020 - 10:50 

We have successfully re-started the booster and anticipate full restoration of your water supply. We have been monitoring the pressure in the area which has been building over the last 24 hours as the network has been recovering. 

Should you experience any discoloured or aerated water which is not uncommon following a mains interruption, we recommend that you leave a mains fed tap running for approximately 5-10 minutes. Discolouration of the water is caused by small particles of iron which are within the mains and disturbed during interruptions.

Cloudy water is caused by air that becomes trapped in the mains, neither of these are harmful to your health. To see more about how to clear discoloured or aerated water why not watch our short video guide here

We are sorry for the inconvenience caused by this incident and would like to thank you for your patience.

This message will be removed after 13:50

Update 23:15

We will continue to monitor the production sites that feed your area. We are treating and pumping water as quickly as we can but need your help to bring pressures back to normal by avoiding any non-essential water use. For more info please visit:

We are sorry for any inconvenience caused.

Update 21:15

A technician is on their way to investigate a fault at our production site. Due to the exceptionally hot weather, the demand for water is significantly higher. This is causing intermittent faults with our booster that pumps the water to your area.

We are diverting water from other areas to support the network, however customers may experience lower pressure during peak times.

We're asking all customers to try and keep their water usage to a minimum during this time to reduce the demand on our network.

We are sorry for the inconvenience caused.

This message will be updated after 23:20

If you are in the above area and are experiencing problems with your water supply, we currently have a problem with one of our boosters, which may be affecting you.

Our technician is on their way to investigate and a further update will be provided as soon as possible.

During this time we ask you not to use any electrical appliances that require a water supply, for example washing machines or dishwashers and to conserve water from storage tanks during the time your water supply is interrupted.

If you do still have a supply, we would advise you to store some water for drinking, in case your water has to be switched off for a repair to be completed.

We are sorry for the inconvenience caused and aim to restore your supply to normal as soon as possible.

This message was added at 20:45 and will be updated after 22:45

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