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Network mains sampling and flushing

The water entering our mains is of a high quality. However, over time natural sediments can build up in the pipes which could affect the taste, clarity and colour of the water.

We carry out a variety of maintenance activities to ensure that we supply clearer, fresher drinking water. You may have received a letter from us about carrying out a short programme of mains sampling and flushing in your area.

First we sample the water from a fire hydrant and, if necessary, we carry out a short programme of flushing out the water mains near you.

Frequently asked questions about network mains sampling and flushing in your area:

Will my water be turned off?

No, we will endeavour not to turn off any customer’s water supply
The process involves opening hydrants to take samples from the water network. There is a small risk you may experience low pressure during the night but the water supply is not turned off during this work.

Can I use my washing machine / dishwasher during the night?

No, we recommend no appliances are used during the night on the planned dates /times of our sampling

The process of sampling from hydrants may cause the water to become discoloured. For this reason the work is carried out at night between 11pm and 5am to minimise disruption. Use your appliances as normal at other times.

I’ve turned on the tap and the water isn’t clear, what do I do?

Run the kitchen tap until clear

The following morning the cold kitchen tap should be run until clear before any water is used. You do not have to boil their water before use.

I’ve ran my kitchen tap, but the water is still not running clear?

Please contact the Customer helpline 0845 601 8855 and quote the reference number from your letter

Can I use my central heating system throughout the night?

Yes, the work will have no impact on your central heating system. The central heating system should not be directly connected to the water network.

Why are the works being done during the night, will it be noisy?

All work is undertaken during the night to minimise any disruption to the water supply. 
We endeavour to keep all noise disruption to a minimum but the work we undertake will cause some light minimal background noise e.g. some hydrants running and lifting of lids

How long will sampling/flushing work take?

Each area normally takes one to two nights to sample.  The flushing duration depends on the size of the area and may take a few days longer

Your feedback is important to us. Please provide this using the feedback form below

Have you experienced discolored water in the last 12 months

Did the work carried out by our respresentative cause any unreasonable disruption