Treatment Plants

McConnell Dowell delivers advanced water and wastewater treatment facilities that support growing communities, protect environmental values and enhance long-term water security. 

With experience across treatment plant upgrades, renewals and new-build facilities, the company provides integrated solutions while maintaining operations in live treatment environments.

This capability is demonstrated through projects including the Pukekohe Wastewater Treatment Plant Upgrade, Māngere Biological Nutrient Removal Facility Upgrade, Tuas Water Reclamation Plant and the Dunedin Water and Wastewater Treatment Plants Upgrade Programme. By combining innovative construction methodologies with operational certainty, McConnell Dowell delivers treatment facilities that improve water quality and provide lasting value for communities.