Construction work will start in Woodview Close before moving along the A24 Epsom Road to the junction of Bramley Way, where it will finish.
Work will start during the week commencing 16th November 2015 and is due for completion by May 2016.
Simon Thomson, Project Engineer at Sutton and East Surrey Water, said: “The existing water mains – some of which were laid in the 1930s – have done sterling work in transporting thousands of litres of water every day for many years.
“However, they are now reaching the end of their lifespan, with an increasing number of bursts occurring. Each time this happens it causes unplanned emergency repairs, interruptions to customers’ water supplies and the loss of water through leaks and bursts.
“Our scheme will make sure both existing and future customers in this part of Ashtead continue to receive a reliable supply of top quality drinking water.”
Due to the need to work in the highway, temporary traffic lights will be in place to keep the public, motorists and the workforce safe. If necessary, these lights will be manually operated at peak times to keep traffic in the area moving.
The scheme forms part of Sutton and East Surrey Water’s £17.25 million investment programme during 2015/16 to upgrade its extensive network of pipes, pumping stations and treatment works.