Guernsey Water will start work to install a new ring main to secure water supplies and pressure for the northern parishes this week.
The work that will see Rectory Hill closed for 12 weeks is part of the utility’s plans to future-proof Guernsey’s infrastructure.
The current phase of work involves the installation of 400m worth of pipework under Rectory Hill, which will close from Tuesday.
Guernsey Water says this proactive investment will save costs and disruption compared to addressing problems later.
The previous phase of the works were started in November last year, and Guernsey Water said they finished on time and on budget. The road reopened after a month.
Carl Falla, Capital Delivery Manager, said the next phase of the work is also essential.
“This essential island infrastructure will secure sufficient and resilient water supplies for the northern parishes for decades to come,” he said.
“With increased growth and development across the island, failing to carry out this work now could result in pressure drops, and even a loss of supply to thousands in future.”
In all the future-proofing efforts are costing approximately £11million and are estimated to take five to seven years to be completed.
The work is essential for future growth and development of the island said Mr Falla.
“As well as safeguarding water supplies into the future, starting this work now also represents cost and disruption savings when compared to fixing issues as they arise.
“We are working hard to maintain our firm financial foundations, and planning decades ahead is just one of the ways we are doing that.”