It will be a relief for local motorists as the works have caused weeks of congestion in the Co Derry village.
Pipe laying work is now complete with some final work still to be completed, including CCTV surveys of the new sewers, and work on the traffic lights at Main Street at the end of this week.
This scheme represents an investment of approximately £900,000 to upgrade the sewerage system and reduce the risk of flooding in the Hyacinth Avenue area of Ballykelly.
This is welcome news for residents who have suffered previous flooding incidents.
Mark Sefton, NI Water Senior Project Manager said: “We are delighted that through the ongoing efforts of our NI Water project team including BSG Civil Engineering and RPS, we have been able to deliver this challenging programme of major work over 2 weeks ahead of schedule.
“This is good news for the local community as the upgraded sewerage system will enable Ballykelly to cope better during periods of heavy rain in the future.