The Lyttelton Harbour wastewater project will connect the harbour's wastewater to the main Christchurch system. To do this, we're building pump stations around Lyttelton Harbour and installing a wastewater pipeline through the Heathcote Valley.
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The Lyttelton Harbour wastewater project will end the routine discharge of treated wastewater into the harbour, an important environmental milestone for our city.
The project is being constructed in four stages and once complete will redirect all of Lyttelton Harbour's wastewater to Christchurch's main treatment plant in Bromley.
Work is now underway on phase three and phase four of the four-stage project, including the 4.5km Heathcote Valley pipeline. The entire project is planned for completion and commissioning in early 2022.
The Lyttelton Harbour wastewater project is part of the Whaka-Ora Healthy Harbour Plan to restore the cultural and ecological health of Lyttelton Harbour.
Read our latest newsletter(external link) for updates on the Lyttelton Harbour Wastewater Project.
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. We'll commission the new wastewater network once all phases are complete. This is currently planned for early 2022.
Phase one
A fibreglass pipeline has been installed above the Lyttelton tunnel to transport wastewater from Lyttelton. This work was carried out in conjunction with NZTA’s fire protection upgrade work on the tunnel.
Phase two
Submarine pipelines were 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 were installed to connect the Lyttelton wastewater treatment plant to the Simeon Quay pump station and the pump station to the Lyttelton tunnel wastewater pipe.
Phase three
We’ve built pump stations at the Governors Bay, Diamond Harbour and Lyttelton (Cashin Quay) wastewater treatment plants. We are now testing and commissioning these pump stations, as well as constructing a new pump station at Simeon Quay in Lyttelton.
Work on this phase started in July 2018 and is expected to be complete in 2022.
Phase four
The Heathcote Valley pipeline involves the installation of an underground pipeline connecting the Lyttelton wastewater system to the Christchurch Wastewater system via Heathcote and Woolston.
The Heathcote Valley pipeline runs from the Heathcote side of Tunnel Road, under Bridle Path Road and through Port Hills Road to Mauger Drive and Scruttons Road, under the paddocks parallel to Tunnel Road, under the Heathcote River and connecting to the Woolston pump station in Alport Place.
From there the wastewater will be pumped through to the Christchurch Wastewater Treatment Plant in Bromley. Construction on this final phase started in March 2019 and we plan to finish this work in 2022.
Project background
Overview
There's a lot of work to be done above and below the ground to connect the Lyttelton Harbour's wastewater to the main Christchurch system. To do this, we're converting treatment plants and building pump stations around Lyttleton Harbour and installing a wastewater pipeline through the Heathcote Valley.
Until now, wastewater has been fully treated at wastewater treatment plants in each of the townships before being discharged through outfall pipelines into Lyttleton Harbour.
The project is being constructed in four stages and involves the installation of submarine pipes under the ocean floor to transport wastewater from Diamond Harbour and Governors Bay wastewater treatment plants to a new pump station on Simeon Quay in Lyttelton.
Wastewater is then pumped through Tunnel Road and the new Heathcote Valley pipeline and connect to the Christchurch wastewater treatment plant via an existing pump station in Woolston.
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.
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 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.
News
Check out the latest newsletters for the Lyttelton Harbour wastewater project.
- September 2021 newsletter(external link)
- April 2021 newsletter(external link)
- December 2020 newsletter(external link)
- October 2020 newsletter(external link)
- August 2020 newsletter(external link)
Read more about the project on Newsline
27 September 2021
Extra funding for Lyttelton harbour wastewater scheme(external link)
The budget of $54 million for the Lyttelton Harbour Wastewater Project has now been increased to $60.5 million. The extra money is needed to redesign and construct some elements of the pump stations, work around some difficult and unforeseen ground conditions and slips, and cover the costs of COVID-19 related delays.
14 October 2020
Finish line in sight for Lyttelton Harbour wastewater project
(external link)Four new pump stations have been built around the harbour, to serve as powerhouses to pump all of the Lyttelton Harbour communities’ wastewater over the hill to the main treatment plant in Bromley.
12 August 2020
Governors Bay walking track temporarily closing
(external link)Part of a popular walking track along the Governors Bay foreshore will be closed weekdays for the next two months.
22 January 2020
Tunnel drilling for Lyttelton Harbour wastewater project delayed
(external link)Plans to drill a tunnel underneath the Heathcote River and Ferry Road roundabout to install a wastewater pipeline have been delayed a month because the specialist equipment needed for the project is tied up on the West Coast.
6 December 2019
Tunnel drilling under Heathcote River early in the new year
(external link)A 535-metre pipeline will be pulled through the tunnel under the river and the Ferry Road roundabout by a method called directional drilling.
14 May 2019
Governors Bay pump station now online
(external link)Lyttelton Harbour is a step closer to being a healthier place to swim and fish since the routine discharge of treated wastewater from Governors Bay has ended.
16 April 2019
Lyttelton Harbour wastewater project digs into the final phase
(external link)Work is underway on the final phase of the $53 million Lyttelton Harbour Wastewater Project through Heathcote and Woolston.
5 March 2019
Lyttelton wastewater project work pumps up
(external link)Work on a $53 million project to upgrade wastewater services in the Lyttelton Harbour area is moving to a crucial phase, with work underway on a new pump station at Simeon Quay.
20 August 2018
Lyttelton Harbour pipeline goes submarine(external link)
A project aimed at improving water quality in Lyttelton Harbour is moving into the first marine stage of construction.
07 June 2018
Tunnel lane closures as pipework powers up
(external link)The big dig is underway as portside trenching work gears up for the construction of submarine pipelines to carry wastewater from Governors Bay and Diamond Harbour to Lyttelton.
14 February 2018
Lyttelton Harbour pipeline project gets blessing
(external link)Local iwi have carried out a blessing ahead of a construction project aimed at improving water quality in Lyttelton Harbour.