Christchurch City Council needs to upgrade Akaroa’s wastewater system. The upgrade reflects our commitment to ensure the Akaroa community is provided with a high quality wastewater system.

Akaroa HarbourA new site has been chosen for technical and operational reasons, and recognises the historical importance of the Takapūneke Historic Reserve, where the current plant is located.

The new plant will be a compact modern facility, making use of recent improvements in wastewater treatment and attractively landscaped to limit visual impact. It will be quiet and will not cause odour. This will minimise the new plant’s impact on the environment and the community.

Benefits of the Akaroa wastewater scheme

  • The scheme recognises the historic and cultural importance of Takapūneke Historic Reserve to all New Zealanders and particularly to Ngāi Tahu.
  • The modern plant will produce extremely clean treated wastewater, which could eventually be used as a non-potable water supply (e.g. for watering public parks and flushing toilets).
  • The plant contributes to higher water quality that supports water sports, recreation, tourism and aquaculture in the region.
  • The new site is closer to more potentially suitable land for irrigation.

Please email the project team if you have any questions or would like to sign up for our project e-newsletter.

Latest news

In June 2017, the flow meter at the Akaroa wastewater treatment plant was found to be faulty. The flow data from the flow meter had been used in the design of the Akaroa wastewater scheme and for the reuse and disposal options. New flow meters were installed and the data from these shows that the flow is much higher than previously thought. Due to seasonal variations in visitor numbers, flow data will continue to be gathered over summer and new design flows will be determined in March 2018. 

In addition to the areas previously considered for irrigation of treated wastewater to land, two new areas are being considered (Redcliffe Point and Hickory Bay). Deep well injection is also being considered and more work is being done on non-potable reuse. Work to reduce groundwater infiltration and stormwater inflow into the wastewater network is also underway.

A briefing to the Banks Peninsula Community Board on the Akaroa Wastewater Scheme was given on 30 October 2017 [PDF, 327 KB]. The community board decided to reconvene the Akaroa Treated Wastewater Working Party to consider reuse options in light of the new flow data.

The Environment Court has granted an extension to the appeal and a progress report needs to be provided to the court by 25 May 2018. The Council expects to consult on options in July/August 2018 and hopes to make a decision on which option to pursue by the end of 2018. 

Resource consents

The Council has obtained resource consents for building and operating the new Akaroa Wastewater Treatment Plant on Old Coach Road and a new pump station in the boat park at Childrens Bay, and for upgrading wastewater mains and the three existing pump stations. However, the Council's applications for consents to construct a new pipe outfall to Akaroa Harbour, and discharge treated wastewater via that pipe outfall, were declined, on the grounds that the discharge was offensive to Ngāi Tahu and because the Hearing Commissioners considered that alternatives to the discharge to the harbour had not been adequately investigated.  For more information, view the Decision of the Hearings Commissioners(external link).

The Council has lodged an appeal against the decline of those consents but will not be making a decision on pursuing that appeal until it has reassessed alternatives for the discharge.

Lincoln University trials

Lincoln University conducted a lysimeter trial where treated wastewater from the Duvauchelle wastewater treatment plant was irrigated onto soil cores taken from the golf course at Duvauchelle and the Takamatua Peninsula. 

Lincoln University is also conducting a trial where various native plant species are irrigated using treated wastewater from the Duvauchelle wastewater treatment plant. 

The key findings were that wastewater irrigation enhanced pasture growth and tree growth, that treated wastewater could be applied at a rate of 500–800mm per year and that nitrogen leaching was negligible compared to that from grazed pasture. 

Lincoln University Lysimeter Trials and Native Species Irrigation Trials report [PDF, 1.6 MB]

Consultation on reuse, treatment and disposal options 3 April 2017 to 8 May 2017

Consultation has closed on the options for the beneficial reuse, treatment and disposal of treated wastewater from Akaroa. As the flow data on which the options were based is incorrect, there will not be a Council hearing on these options. The consultation booklet [PDF, 15 MB] summarised the options that were considered:

  1. Irrigation of trees or pasture in Robinsons Bay.
  2. Irrigation of trees or pasture at Pompeys Pillar.
  3. Irrigation of trees or pasture in Takamātua Valley, in combination with another area.
  4. Non-potable re-use in Akaroa, in combination with another option.
  5. Disposal via a new outfall pipeline to the mid-harbour (the original proposal for which consent was sought).

For the detailed information about the options being consulted on, please refer to the report Akaroa Wastewater Investigation of Alternative Sites for Land Irrigation (CH2M Beca, March 2017) [PDF, 4.2 MB] and its appendices:

Akaroa Treated Wastewater Reuse Options Working Party

At the meeting on Monday 30 January, the Banks Peninsula Community Board received a Community Strategy Toward an Acceptable Solution to the Disposal of Akaroa Wastewater, prepared and adopted by the community of Robinsons Bay and adopted by Friends of Banks Peninsula.  This included a request that Council takes a collaborative approach with the community on this project and that public consultation is delayed until April to allow this to occur. 

In response to this, the Board resolved to establish a Working Party to collaborate with the community and engage on community concerns about the Akaroa Treated Wastewater Disposal Project, and to delay any further consultation on the project until April 2017. 

The Community Board prepared terms of reference for the working party [PDF, 32 KB].  The notes from each of the working party's meetings are as follows: