Irish Water say works on the Wastewater Treatment Plant in Blessington are due to be completed by the end of the month.
Once completed the plant is expected to serve a population of up to 9,000 residents in the area.
Councillor Gerry O' Neill says the works have stalled new housing developments in the area which are badly needed.
Shaping the Future of Newtownmountkennedy: A Town Team’s Vision for Growth and Community
North Wicklow GP Advice As Flu Season Hits Hard Locally
Wicklow Struggles With Rising Youth Anti-Social Behaviour Amid A Lack Of Collaboration And Resources
Planning A Seasonal Dip? Follow These Water Safety Tips
TD Says No 'Realistic' Rail Plan Evident Amid Failure To Address Growing Commuter Crises For Wicklow