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You are here : At Home > Alerts & planned works > Renewing water mains

New water mains and renewals

Installing new water mains and renewing old ones that will allow us to move water across our communities ensuring a resilient customer supply and enabling us to end unsustainable abstraction.

We are investing in our network to minimise bursts and by installing new pipelines that will allow us to able to keep more water in the ground to help your local chalk stream whilst continuing to provide your community with a reliable and high-quality supply of water for many years to come.

  • Why are the mains being updated?

    Old iron pipes means...
    • Cast iron pipes that crack when moved
    • Burst mains and leaks wasting water
    • Worn out corroded water mains
    • Water being cut off for emergency work
    • Traffic disruption and holes in the road

    When a water main bursts we have to repair it as quickly as possible, as the escaping water is a potential threat to public safety and can damage property and the environment.

    We are replacing these old iron water mains with new plastic pipes so that we can provide you with a reliable supply of drinking water and reduce the disruption caused to your community, when a water main bursts.

    New pipe (cross section)

    New plastic pipes means...
    • Flexible plastic water mains
    • Water friendly pipes
    • Trouble free pipes
    • A reliable water supply 24/7
    • Planned traffic friendly working
  • Identifying pipes that need renewing

    With 16,500 kilometres of pipes supplying over 1.2 million customer properties renewing our network is a non-stop job.

    Renewing these pipes ensures a continuous, secure supply of top quality tap water at the lowest possible price to our customers. Renewing pipes is a costly operation meaning careful prioritising of those pipes that most urgently need replacing. We constantly check the condition of our pipes and use historical data to predict which are most likely to burst. When selecting a renewal scheme we also check that our work won’t cause unnecessary interruptions to customer supplies, flooding or major traffic disruption.

    Once we’ve identified the most urgent pipes for renewal, we liaise with the Highways Authorities to agree when we can carry out the work.  We appreciate that renewals can cause disruption and inconvenience to our customers, but with careful design and planning we will make sure we renew the right pipes at the right time at a reasonable cost to ensure our infrastructure is fit for 21st century needs.

  • Sustainability Abstractions

    Our purpose is to provide high quality water and protect the environment now and for future generations.

    Our Central region is home to around 8-9% of the UK’s chalk streams. Maintaining our local environment forms part of our long-term plans. We have committed to reduce the amount of water we abstract from groundwater sources by over 36 million litres across our supply area between 2020 - 2025. And ultimately to end unsustainable abstraction from chalk groundwater sources.

    By reducing abstraction from chalk groundwater sources, we aim to sustain these precious resources for future generations and see flourishing habitats and biodiversity around these rivers. Alongside this our Revitalising rivers programme will help to restore sections of our chalk rivers to improve local habitats and wildlife.

    Our new trunk main projects are part of our sustainability reductions programme which will ensure we have enough water to meet demand whilst leaving more in the environment. This programme plays a vital part in improving the health of the globally rare chalk stream habitats that run through our supply area.

    For more information, Our Business Plan for 2020 to 2025 outlines how we will take significant steps to improve the environment in the areas in which we operate and continue to provide high quality water to our customers.


Current Works

  • Harefield to Oxhey Woods Trunk Main

    Our purpose is to provide high quality water, whilst protecting the environment for all generations.

    Chalk streams are under threat from the impacts of climate change and the demand for water. Historical river alterations of these precious habits have also meant that some stretches of chalk streams have lost their natural path and connection to groundwater.

    Our trunk main projects are part of our sustainability reductions programme which will ensure we have enough water to meet demand whilst leaving more in the environment. This programme plays a vital part in improving the health of the globally rare chalk stream habitats that run through our supply area.

    We have committed to reduce the amount of water we abstract from groundwater sources by over 36 million liters across our supply area between 2020 - 2025. And ultimately to end unsustainable abstraction from chalk groundwater sources.

    By reducing abstraction from chalk groundwater sources we aim to sustain these precious resources for future generations and see flourishing habitats and biodiversity around these rivers. Alongside this our Revitalising rivers programme will help to restore sections of our chalk rivers to improve local habitats and wildlife.

    As a water supply company we need to ensure that as we make changes to benefit the environment we continue to supply high quality drinking water to our customers and maintain the security of that supply.

    The sustainability reductions programme will do this by constructing a number of new assets across our supply network by 2023/24. These range from new pumps, water mains and water treatment facilities. One of the assets that has been identified is a new trunk main between Harefield Reservoir and Oxhey Wood Reservoir.

    Once installed this pipeline will allow us to move water from one water resource zone to another ensuring a resilient customer supply and enabling the reductions from groundwater sources to happen.

    For more information, Our Business Plan for 2020 to 2025 outlines how we will take significant steps to improve the environment in the areas in which we operate and continue to provide high quality water to our customers.

    How will it affect customers?

    Road closures and diversion routes will be needed to complete the project.

    We have identified domestic and commercial customers that will be affected by the works and will be providing information to them in advance, detailing a point of contact, the expected impact and duration.

    Hillingdon Highways Department are working closely with us to ensure that road closures, diversions and traffic management plans consider key infrastructure such as hospitals, vaccination and testing centres.

    Work will mostly be between 08:00hrs – 18:00 hrs Monday to Friday with occasional weekend working agreed in advance.

    This page will be kept up to date with information on the project.

    Where will we be working?

    Work will be taking place on private land between Harefield Reservoir and Cygnet Close and in the following streets:

    Northwood - Cygnet Close

    Duck Hill - The Avenue

    Rickmansworth Road - High Street

    Northwood Way - Hillside Road

    Potter Street Hill - Sandy Lane

    COVID 19

    We are fully COVID-19 compliant and our teams follow Government & Public Health protocols to ensure the safety of customers and staff.

  • Hemel to Stonecross New Trunk Main (St Albans)

    Why are you laying a new water main?

    At Affinity Water, we are committed to providing high quality water and helping to protect the environment for all generations.

    You may have heard about our campaign ‘Save Our Streams’ which aims to help customers reduce their water use through free water saving devices, tailored advice and home water efficiency checks.

    The challenges of climate change, increases in population and demand for water means that some of our globally rare habitats, such as chalk streams are under threat. Chalk streams have been described as England’s ‘Amazon’ and are rarer than coral reefs or Bengal Tigers. This means we must do all we can to protect them and leave more water in the natural environment.

    We take water from deep below ground, which feeds into some chalk streams on the surface. The new water main, which represents an investment of £5.8 million, will allow us to move water around our supply area more efficiently. This means we will be able to keep more water in the ground to help your local chalk stream, the River Ver, whilst continuing to provide your community with a reliable and high-quality supply of water for many years to come.

    How will it affect customers?

    Road closures and diversion routes will be needed to complete the project.

    We have identified domestic and commercial customers that will be affected by the works and will be providing information to them in advance, detailing a point of contact, the expected impact and duration.

    Hertfordshire Highways Department are working closely with us to ensure that road closures, diversions and traffic management plans consider key infrastructure such as hospitals, vaccination and testing centres.

    The working hours are as follows: Monday to Saturday 7am to 7pm and Sunday 9am to 4pm.

    This page will be kept up to date with information on the project.

    Location

    Where will we be working?

    The installation of the new water main will require a rolling road closure of Redbourn Road in approximately 200m sections. The works will start at the Batchwood roundabout and be completed close to the crossing of the River Ver near Shafford Cottages.

    PHASE 1

    Phase 1 – Redbourn Road (A5183) lane closure – Monday, September 13th - for an expected duration of 12 weeks.

    We’ll be installing the new water main in your area over the coming weeks and our contractor, J Browne Construction, will be completing the work on our behalf. To do this, we may need to work directly outside your property. We know that road works can be inconvenient, and we would like to apologise for any disruption this may cause. Please be assured that this work is essential, and we’ll do our best to keep any disruption to a minimum.

    What traffic management will be in place?

    There will be a one-way road closure of Redbourn Road for traffic travelling toward St Albans. This road closure will be clearly signed at the Redbourn roundabout with a diversion in place. A one-way traffic system will be in place for vehicles travelling away from St Albans on Redbourn Road through the road works.

    What is the diversion route?

    • At the Redbourn roundabout, take the A5183
    • At the next roundabout, take the 3rd exit onto Redbourn Lane
    • At the next roundabout, take the 3rd exit onto St Albans Rd/A1081
    • Continue to follow A1081 and turn right onto Batchwood Drive

    Location of Phase 1 and Diversion Route

    The map below shows the location of the works on Redbourn Road highlighted in yellow and diversion route for traffic highlighted in blue.

    Why is this Traffic Management Plan being used?

    We’ve worked closely with and revisited the plans with the Highways Agency and the Council to minimise any disruption. This lane closure plan is the best solution for us to complete the works as quickly as we can and to keep our teams and the public safe.

    • The new main is being installed under the St Albans bound lane in Redbourn Road, as a large gas main is already installed under the opposite lane.
    • It would be unsafe to allow traffic to travel on the opposite carriageway and we’d also have to divert pedestrians off the single-track footway.
    • It was decided that temporary traffic lights were not a suitable option as this would lead to larger traffic delays, more congestion in St Albans and a risk if red signal changes were ignored. This option would also increase the duration by a further six weeks.

    Will there be further phases of this project?

    The Hemel to Stonecross project is scheduled to take place in multiple phases from September 2021 to June 2022. The installation will also be taking place on Batchwood Drive and sections of Harpenden Road. Further notifications will be provided for these phases.

    COVID 19

    We are fully COVID-19 compliant, and our teams follow Government & Public Health protocols to ensure the safety of customers and staff.

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