The joint venture, known as CMDP, secured the contracts as part of the utility’s asset management plan 7 (AMP7) programme, which runs until the end of 2025.
The deals will see the pair upgrade wastewater treatment works at Testwood near Southampton and Burham in Kent.
Costain and MWH Treatment will work closely with Southern Water engineers across both sites to develop designs for the projects.
Both sites will receive major renovation, refurbishment and expansion to cope with rising demand for drinking water and increasing volumes of wastewater.
At Testwood, CMDP will improve abstraction points, pumping stations, and flow and filtration assets. Work will also include upgrading rapid gravity filtration facilities and repurposing contact reservoir tanks.
At Burham, the joint venture will carry out a full refurbishment of the low-lift pumping station and granular-activated carbon filters, as well as site-wide chemical-dosing upgrades. It will also boost the usable volume of the lake that feeds the site.
CMDP programme director Chris Hodgson said: “Southern Water is upgrading its infrastructure to ensure it continues providing clean drinking water to its customers while improving resilience for the future. This is important work that will have a transformative impact on the lives of residents and local communities.
“We will continue to deliver innovative solutions to Southern Water to not only ensure we support it in meeting its regulatory obligations, but also add value by identifying opportunities to increase efficiencies.”
Southern Water director of water Tim Mcmahon said the utility was looking forward to collaborating with Costain and MWH Treatment.
“With a changing environment and a growing population, it is important that we make strategic investments to upgrade facilities and ensure they are fit-for-purpose for the long-term,” he added.
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