The group was awarded the deal in a joint venture (JV) with BAM Nuttall and Balfour Beatty.
The project is valued at £416m to the JV.
The £4.2 billion Thames Tideway Tunnel is currently the largest infrastructure project to be undertaken by the UK water industry and will tackle sewage pollution in the tidal River Thames.
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John Morgan, Chief Executive of Morgan Sindall, said: "Morgan Sindall plc has a very strong track record in complex infrastructure projects of this magnitude and we will be bringing this experience to bear as we deliver vital improvements to London's infrastructure.
"We are delighted to be working with Bazalgette Tunnel Limited and our joint venture partners to create a cleaner and healthier River Thames for generations to come."
(LM)
