The Central Interceptor is a new wastewater tunnel proposed to run between Western Springs and the Mangere wastewater treatment plant. The tunnel will be approximately 13 kilometres long and will lie between 22 and 110 metres below the surface. It will cross the Manukau Harbour at a depth of approximately 30 metres below the seabed. Along the proposed route it will connect to the existing trunk sewer network to divert flows and overflows into the tunnel.
For up-to-date information on the Central Interceptor project, please visit our projects pages