The Duvauchelle wastewater scheme was constructed in 1988. Following minor upgrades in 1996 and 2002 and the addition of 44 new connections for the Ngaio Point subdivision, it now serves a community of about 250 permanent residents.
Wastewater receives primary and secondary treatment within the plant followed by a UV disinfection process before being discharged through a 1600 metre marine outfall. Sludge is removed regularly and transported to the Christchurch Wastewater Treatment Plant.
The main resource consent for Duvauchelle wastewater discharge to the harbour (CRC 102952) expires in 2023. As a condition of the consent, a community working party has been formed to provide community and tangata whenua input into the process of identification and selection of a long-term method of treatment and disposal of wastewater from the Duvauchelle Wastewater Treatment Plant.
In October 2018, the working party reached a decision on the preferred option which is to reuse the treated wastewater on the Akaroa Golf Course at Duvauchelle. This option is the only viable non-harbour discharge option for the future of the treated wastewater from Duvauchelle, however there will need to be a detailed agreement between the Golf Club and the Council to enable further progress on this option.
A report on the proposed programme for implementation of the preferred option before the consent expires must be submitted to Environment Canterbury by the end of October 2020. This allows three years to obtain resource consents and construct any necessary infrastructure before the current consent expiry date in 2023.
The Council will be reporting regularly to the community working party and the Akaroa/Wairewa Community Board on scientific and engineering investigations into potential options for land disposal of treated wastewater.