View all current alerts (2)
How are we doing?
View our frequently asked questions >
contact us >
New customer? Start here.
Save time and manage your account online
Register today, it's quick and easy.
Need extra help?
The Priority Services Register (PSR) is free to join. It helps us know who may require extra help, and look after any customers with communication, access or health needs.
Apply for Priority Services
Do you need a statement?
View a summary of your latest bills and payments with My Account. You can also download and print copies of your statement.
Apply for a water meter
Having a meter really puts you in control of your bill.
You can see how much water you use and if you use less water you are also likely to save on your energy bills!
We are here to make your move easy.
It takes just 5 minutes to tell us online.
Do you have no water?
Use our checklist to help identify the cause of a loss of supply.
Find out more
FREE water efficiency check
To help you save water, save energy and save money, with every meter fitted we're offering a Home Water Efficiency Check (worth around £80) for FREE!
Do you have low pressure?
Find out what could be causing low water pressure in your home.
Hello. Sign in.
You are here : At Home > Alerts & planned works > Cleaning our water mains
The water we provide you is of a very high quality. However, over time, natural sediments may build up in our pipe work. If these are left, you could occasionally experience some discolouration of your water. As part of our routine maintenance programme, we carry out regular activity to flush the water mains to remove these sediments, where this is required.
We are principally employing a technique called Ice pigging to clean the majority of the trunk main network. Trunk mains supply water from our water treatment works and storage facilities such as our towers and reservoirs, into the local distribution network. Local distribution mains, those pipes that supply water from trunk mains to customer’s homes, will be cleaned by means of a systematic flushing programme.
Over a period of time, harmless sediment can build up on the inside of these trunk mains and can result in customers receiving discoloured water.
To further reduce the likelihood of discoloured water we are carrying out a major programme of work to clean our trunk water mains and local distribution mains.
Find out where we are working
There are two types of water mains; Trunk mains and local distribution mains. Trunk mains supply water from our water sources, reservoirs and towers into the local distribution network. The Local distribution mains supply water to customer’s homes from the Trunk mains.
Trunk mains supply water from our water sources, towers and reservoirs into the local distribution network. These pipes are larger in size than the local water mains. Typically they range is in size from 200mm diameter (8”) to 1m (40”) in diameter.
We are principally employing a technique called Ice pigging to clean the majority of the trunk main network.
Understand more about how we clean the water mains by ice pigging
Local distribution mains are the pipes that supply water from trunk mains to customer’s homes. Customer supply pipes are connected to these local distribution mains. These pipes typically range in size from 63mm diameter (2”) to 175mm (9”) in diameter.
We clean these distribution mains by means of a systematic flushing programme.
Understand more about how we clean the water mains by mains flushing
Frequently asked questions
I want to replace my mains water pipe
What fittings are approved to use on the UK Water Supply System?
Help with intermittent Leaks
How can I find out who is my water company?
How can I report a water leak?
Can I work on water pipes?
My water is due to go off, but I can't manage without water.
I have no water, what should I do?
What is a Waste of Water notice?
I need a plumber
Registered office: Tamblin Way, Hatfield, Hertfordshire, AL10 9EZ.
Website design & build by Switch