"The project helps to help reduce the likelihood of discoloured water coming out of people's taps every now and then.
"So far more than 8km of pipes have been replaced and when we're finished, we'll have replaced nearly half the town's water pipes, some 13km worth."
The project began in late 2018 and is part of an additional $44m improvement to the district's water networks.
Over the next few months the new water main pipes between the town and the water reservoirs will be connected, and the project will move on to replacing pipes in the northern part of Inglewood.
This phase will take place during the second half of July and there is the chance it might cause short-term instances of discoloured water.
Everything possible will be done to minimise this disruption and NPDC apologises for any inconvenience that may be caused.
The whole project is due to be completed, subject to weather and logistics, at the end of next year.
NPDC looks after more than 800km of water pipes throughout the district; they range in age from new to more than 110 years old.