The new pressurised water main is a critical element of Northern Ireland's most vital water supply system.
NI Water's Director of Engineering Procurement Trevor Haslett said: "The new system not only ensures that the security of supply has been improved but it also means that thousands of people from the North Down area will benefit from the delivery of high quality water, which comes from the Silent Valley where it is treated to the highest European Standards by Northern Ireland's biggest water treatment works at Drumaroad near Ballynahinch.
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"The old North Down trunk main which was built in 1952 required significant investment to increase its capacity and improve the security of supply.
"In addition many of the old impounded water sources in the area needed substantial investment to comply with European Drinking Water Directives.
"However, upgrading the existing infrastructure would still not have accommodated further population expansion in the next 25 years, whereas the new system will.
"This investment shows the commitment of Northern Ireland Water to improving the service we offer to customers."
In total the works, which commenced in April 2006 involved the laying of 78kms of water mains, 17kms of which were large diameter trunk mains.
Close attention was paid to the environmental impact of the project from the planning stage right through to post construction.
The route taken by the NDSTM was determined by environmental factors, avoiding areas of special scientific interest (ASSI's) and locations populated with badger sets and other wildlife, as well as the complicated hydraulic conditions.
To neutralise the carbon footprint created by the works, contractors calculated the volume of carbon generated in the construction process and planted approximately 120 trees over the life of the project at various sites along the route of the strategic trunk main to counteract the effects of the carbon emissions.
The project was undertaken in partnership with McNicholas Construction and designed by Faber Maunsell/AECOM with Capita Symonds as Project Managers.
It is part of Northern Ireland Water's £3bn investment to deliver a 21st Century infrastructure for Northern Ireland.
(PR/JM)
