The Platform-as-a-Service (PaaS) is expected to improve network security, efficiency and collaboration for Tideway staff.
The £4.2bn, 25km Thames Tideway Tunnel is designed to reduce the 39 million tonnes of untreated sewage that, one average, overflows into the Thames each year.
Advanced will provide a portfolio of services, including systems for finance and HR, and business productivity solutions such as SharePoint, Lync and Office 365.
Tideway head of information security Robin Johns said: “As the largest infrastructure project ever undertaken by the UK water industry, it goes without saying that we need extremely secure and cost effective managed services. Advanced stood out as being a respected supplier who implicitly understood all of our requirements and could deliver best value.
“Having a flexible and reliable platform allows us to create a long term IT strategy leading up to and after the completion of the tunnel, in addition to increasing staff productivity.”