Costain Group PLC has been awarded a 6.6 million contract by Thames Water to upgrade strategic treatment assets in Markyate and Brickendon in Hertfordshire. This award is part of Thames Water's Wastewater Asset Assurance Programme (WAAP), which involves the upgrade of wastewater treatment assets. Costain was previously selected to conduct upgrades at Thames Water sites in Sandhurst, Berkshire, and Selborne, Hampshire. Thames Water is investing 1.12 billion in its biggest ever upgrade of sewers and sewage treatment works, with improvements planned at over 250 sites. This project aims to improve the lives of people in the region by enhancing the treatment facilities.