The investment has been announced following a number of bursts in the area in recent months.
Scottish Water will initially focus on a 300-metre section running under King's Inch Road in Renfrew.
Georgina Reid, Scottish Water's corporate affairs manager, said: "This has been the worst affected by recent bursts and customers living in the nearby flats have been extremely patient and understanding while we carried out repairs.
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"By upgrading the existing pipe, we will provide resilience for the local network and peace of mind for customers for many years to come."
From Monday 25 September 2023 trial holes will be excavated in front of the flats on King's Inch Road between Andrew Avenue and Crofton Way.
The work will allow ground conditions to be assessed and establish the presence of other known utilities to allow this phase of the project to be carried out quickly and safely.
The second phase of the project will ultimately see nearly two kilometres of giant 700mm pipe upgraded in an operation to deliver resilience for customers and to protect the environment.
Georgina added: "We have also surveyed the wider sewer network to assess the condition of the pipe coming from North Lodge Waste Water pumping station.
"This information is allowing us to design and plan the delivery of the much-needed upgrade which will dramatically reduce the risk of future bursts.
"As always, we will work with everyone concerned to minimise any disruption and inconvenience and will keep all involved up to date and informed at all stages."
