Drivers are being warned to expect delays as South East Water replaces two kilometres of pipeline in Hook.
Work starts on Monday March 3 and will take place in Station Road, Hook Road and the roundabout at junction 5 of the M3.
The £1.1 million scheme will replace old pipeline with a new, tougher plastic pipe.
Four teams will work on the project to complete it as quickly as possible, some working over seven days and during the night.
Various traffic management measures will be in place and the work is expected to be completed by June 7.
Chris Love, South East Water’s delivery manager said: “We know this is a very important and busy section of road so we have worked with the highways authorities to ensure our traffic management keeps disruption to a minimum.
"To complete the work as quickly as possible we plan to have four teams working at various sections of the project. Where safety and technical considerations allow, some teams will be working seven days and during the night.
"However, we know there will still be delays and we apologise in advance for it. By planning ahead, motorists can ensure they get to their destination on time."
Mr Love said the essential work will replace very old pipework, which is more prone to bursts.
"When we have a burst water main it causes a great deal of disruption while we carry out emergency repairs," he added.