The Lyttelton Harbour wastewater project is a result of existing resource consents expiring for the Governors Bay, Diamond Harbour and Lyttelton wastewater treatment plants.

Currently wastewater from these three areas is fully treated at the treatment plant in each location, before being pumped into Lyttelton Harbour.

Under a decision by the Environment Court, the regular pumping of treated wastewater into Lyttelton Harbour must stop from Governors Bay, Diamond Harbour and Lyttelton by December 2018, December 2021 and August 2029 respectively. 

Instead, submarine pipes will be installed and used to transport untreated wastewater from the Governors Bay and Diamond Harbour wastewater treatment plants to Lyttelton. Wastewater will then be pumped to the Christchurch wastewater treatment plant  through the road tunnel via a new pump station at Simeon Quay in Lyttelton. 

The project is being carried out in four phases with work currently underway on phase one and two.

The four construction phases of the project

Construction of the Lyttelton Harbour wastewater project is being carried out across four phases. Learn more about the different work involved.

Phase One

A fibreglass pipeline is being installed by McConnell Dowell above the Lyttelton tunnel to transport wastewater from Lyttelton. This work is being carried out in conjunction with NZTA’s fire protection upgrade work on the tunnel. 

Phase Two

In November 2017 Council appointed McConnell Dowell as the contractor on stage two of the Lyttelton Harbour Wastewater project.

Work started in March 2018 and involve the installation of submarine pipelines buried approximately one metre under the seabed to transport untreated wastewater from the Governors Bay and Diamond Harbour wastewater treatment plants to Naval Point in Lyttelton. New underground pipes will be installed to connect the Lyttelton wastewater treatment plant to the Simeon Quay pump station and the pump station to the Lyttelton tunnel wastewater pipe.

A temporary contractor’s area along the foreshore near Naval Point will be used during construction but you will still be able to access the fishermen’s wharf and boat ramp during this time. 

Phase Three

Construction of pump stations at Governors Bay, Diamond Harbour and Lyttelton wastewater treatment plants as well as a new pump station at Simeon Quay in Lyttelton. Existing wastewater treatment plants will be disestablished with the tanks converted for storage. Work on phase three started in April 2018. 

Phase Four

Installation of pipes connecting the Lyttelton tunnel wastewater pipe from Heathcote to the Woolston pump station,  including crossings under the railway line and Heathcote River. Construction of this final phase is due to start in the second half of 2018. 

Project background

In 2009 the Council approved a joint working party's recommendation to pump untreated wastewater from Lyttelton, Governors Bay and Diamond Harbour plants through the Lyttelton road tunnel to the Christchurch wastewater treatment plant(external link) in Bromley.

The target is to end all routine discharges of wastewater to Lyttelton Harbour by 2021.

Consultation

Consultation on the scheme took place from 16 September to 12 October 2015 and public drop-in sessions were held in Diamond Harbour on 23 September 2015 and in Lyttelton on 24 September 2015 and 3 March 2016.

During the consultation period 44 submissions were received.

Responses were analysed and public feedback, together with other aspects such as cultural impact, environmental impact, cost, time and ease of construction, were used to support resource consent applications lodged with Environment Canterbury and the Council on 31 March 2016.   The resource consents were granted in October 2016.

Based on consultation feedback, we are burying submarine pipelines approximately one metre under the seabed to transport untreated wastewater from the Diamond Harbour and Governors Bay Wastewater Treatment Plants to Lyttelton. Wastewater will then then be pumped to the Christchurch Wastewater Treatment Plant through the road tunnel via a new pump station at Simeon Quay in Lyttelton.

An overland road option for the Governors Bay pipeline was discarded as a result of the public consultation. 

Updates

Check out the latest updates on the Lyttelton Harbour wastewater project. We distribute newsletters and start work notices throughout the project. 

Newsletters

Newsletter Two – May 2018(external link)

Newsletter One – March 2018(external link)

Start work notices

Work package two start work notice – May 2018

Work package two start work notice – March 2018 [PDF, 1.5 MB]