The work is expected to take six months to complete and will see a number of road closures in place.
Wessex Water will be carrying out improvements to the sewerage network in Downend Road Around 700 metres of new sewers will be built in Sheppard Road, Overndale Road, Downend Road, Kimberley Road and Staple Hill Road. A new storage tank will also be built in the green area at the end of Sheppard Road.
During the work Overndale Road will be closed for 10 weeks, and Downend Road and Kimberley Road will also closed for a short time.
There will also be two-way traffic lights in Sheppard Road, Staple Hill Road and Kimberley Road for part of the work.
The scheme is part of Wessex Water’s ongoing environmental improvement programme and will benefit quality of water in the Henry Slead Stream.
Project manager Andrew Palmer said: “This essential work has been scheduled to start during the school holidays, to minimise disruption to traffic.
“We are also carrying out the work in different sections so there are not multiple road closures in place at any one time. We hope this will help reduce the impact on motorists.”
Wessex Water has written to local residents and business owners to tell them about the scheme.