Costain has been awarded a £150m contract by Thames Water to upgrade wastewater treatment assets at 15 sites across the Thames Valley.
The work forms part of Thames Water’s Wastewater Asset Assurance Programme (WAAP) and is expected to be completed during AMP8, the regulatory investment period running from 2025 to 2030.
Thames Water is carrying out its largest upgrade of sewers and sewage treatment works in 150 years, with improvements planned at more than 250 sites across the region. Costain’s works will include modernising operations at inlet stations, improving the resilience of storm tanks, and carrying out other repairs, modifications and upgrades to wastewater systems.
Costain will split the programme into two regions, each led by a regional senior project manager. The eastern section covers Barkway, Brentwood, Long Reach, Little Hallingbury, North Weald and Standon. The western section covers Aldershot, Burghfield, Esher, Horley, Lightwater, Marlborough, Northleach, Waddesdon and Windsor.
The company has previously been awarded contracts to upgrade strategic treatment assets at Markyate, Brickendon, Sandhurst and Selborne. Costain has also carried out clay compaction trials for the White Horse Reservoir, Thames Water’s new 150m cubic metre reservoir in Oxfordshire, which will provide a resilient water supply for up to 15 million people.
Matt Bateman, water sector director at Costain, said: “We have a long-term, trusted partner relationship with Thames Water and this award is built on our excellent track record of identifying construction efficiencies and delivering best-in-class solutions. We’ll work closely with Thames Water and our supply chain partners to deliver these essential infrastructure upgrades, that will build resilience into the region’s critical wastewater system, efficiently and safely.”
Tim Horton, capital delivery director at Thames Water, said: “We are delivering the largest programme of investment in our wastewater network in more than 150 years, helping to improve resilience across our region and support a growing population.
“Costain has a strong track record of safely delivering complex infrastructure projects and will play an important role in upgrading key treatment assets across these 15 sites. Together, we will modernise critical wastewater infrastructure, improve operational performance and help ensure we continue to provide a more reliable service for our customers and the environment.”
Main image: Esher Sewage Treatment Works. Credit: Thames Water
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