This page contains information about the wastewater treatment plants which Council owns and operates.
19/08/2015 3:29 p.m.
Council owns and operates 9 wastewater treatment plants throughout the district. Each treatment plant operates under the terms of a specific resource consent which sets levels for the quality of the wastewater which is discharged.
The treatment plants
Hikurangi wastewater treatment in Jordan Valley Road treats the sewage from Hikurangi. The sewage is predominantly domestic with a few commercial activities.
The treatment plant was constructed in 1964. Subsequent upgrades have been carried out to increase the capacity and efficiency of the plant.
In 2009 a membrane filtration plant was constructed to improve the quality of water leaving the plant. The membrane is so fine even bacteria cannot get through it.
The most recent upgrade was completed in 2014. This upgrade included the desludging of and installation of floating treatment media in the wetland. This was done to improve the efficiency of the membrane filter plant. At the same time, a rock waveband was constructed around the perimeter of the oxidation pond to prevent further erosion of the banks.
Ngunguru wastewater treatment plant in Waiotoi Road treats the sewage generated by Ngunguru. The sewage is domestic.
The treatment plant was upgraded in 2009 and includes an aerated oxidation pond and wetlands. The ultraviolet disinfection system has since been upgraded to further increase the quality of the final treated effluent.
Oakura wastewater treatment plant in Wharua Road treats the sewage generated by Oakura. The sewage is domestic in nature.
A new treatment plant was constructed in 2009 to enable greater capacity of sewage to be treated to a higher standard before the new sewer network was built.
New disposal fields have been constructed behind the plant to further improve effluent disposal and output capacity.
Portland wastewater treatment plant in Portland Road treats the domestic sewage from the local properties along Portland Road from Atkins Road to Tikorangi Road. The plant includes a pond and wetland system.
Ruakaka wastewater treatment plant in Sime Road treats sewage from Ruakaka, One Tree Point and Marsden Bay areas. The sewage is predominately domestic in nature with a small percentage of industrial content. The plant currently incorporates a two stage pond system with wetlands.
In 2013 this wastewater treatment plant was upgraded to cope with increased development in the Ruakaka area and increased flows from the Ruakaka South sewer extension. This upgrade facilitated the disposal of treated wastewater to a 20ha site in Rama Road.
Ruakaka South Sewer Extension
Ruakaka Treatment Plant
Tutukaka wastewater treatment plant in Matapouri Road treats the sewage from the small community neighbouring the Tutukaka marina. The treatment plant was constructed in 2005.
The system involves re-circulating wastewater through filters and then disinfecting the treated wastewater using ultraviolet light. The effluent is of high quality and is discharged to wetlands and then into a waterway leading to Tutukaka harbour.
Waiotira is our smallest wastewater treatment plant and is located at Waiotira Road near the junction of Mititai Road. The plant currently treats the sewage from 7 properties along the Waiotira Road. A recent upgrade enables extra volume to be treated for future development of the local area. The system includes a large septic tank and wetlands.
Waipu wastewater treatment plant off Nova Scotia Drive treats sewage from Langs Beach, Waipu Cove and Waipu. The sewage is predominantly domestic with minor commercial activities. The current system involves a pond and wetlands. The treated wastewater is discharged to land via a soakage system.
An upgrade of the local treatment plant is planned to provide additional capacity to meet future growth of the local area.
To improve water quality entering the wetlands, the oxidation pond was desludged in 2015 and a screening system was installed to prevent such things as rags and wipes entering the pond.
The telemetry system was upgraded at the same time so operators could monitor the plant 24/7.
In 2015/16, the wetlands will be desludged and floating treatment media will be installed, further improving the water quality leaving the plant.
Whangarei wastewater treatment plant in Kioreroa Road is the main treatment plant for Whangarei and treats the sewage from the city, including Onerahi and the Whangarei Heads area. The sewage is from both domestic and industrial sources.
The system provides comprehensive treatment of wastewater which includes primary settlement, trickling filters, activated sludge, secondary clarification, filtration, ultraviolet light disinfection and finally wetland treatment.
In 2013/14 major work was undertaken to upgrade the ultraviolet light disinfection so that even in a storm, all effluent leaving the site will be disinfected.
In 2014/15 the wetlands were desludged and deepened and floating treatment media were installed and pipework from the plat was upsized. This was done so that not only is all effluent leaving the site disinfected but it has also had a final polish through the wetland before entering Limeburners Creek.
For further information about other projects, follow the link below.