There are three types of wastewater schemes provided by the Council - gravity, STEP and pressure.
Wastewater service is provided via gravity through piped reticulation to a large treatment plant often with pump stations within the reticulated area.
For any properties with an on-site septic tank within an urban service area, the tanks are generally owned and maintained by the individual property owners, including any cleaning.
Wastewater service is provided by a Septic Tank Effluent Pumping (STEP) system.
Raw sewage is collected in private on-site septic tanks where it receives primary treatment and screening. The primary treated effluent is then pumped to a treatment plant. The on-site septic tanks are owned and maintained by the individual property owners while the common rising main and treatment plant is owned and operated by the Council.
Wastewater service is provided by a pressure sewer system.
Raw sewerage is collected in privately owned on-site pump stations. These contain a macerating pump which breaks up the raw sewerage into a slurry before pumping into the Council-owned mains through to the treatment plant.
|Scheme||No. of Properties||Sewer service Type||Initial Treatment Plant||Primary Treatment|
|Kaiapoi||Gravity and pressure
||Kaiapoi||Aerated lagoon, oxidation ponds and wetlands|
|Pegasus||Gravity and pressure
||Woodend||Aerated lagoon with wetlands (Woodend)|
|Woodend||Gravity||Woodend||Aerated lagoon with wetlands|
|Woodend Beach||Gravity||Woodend||Aerated lagoon with wetlands (Woodend)|
|Waikuku Beach||Gravity and pressure
||Waikuku Beach||Oxidation ponds with wetlands|
|Pines Kairaki||Gravity||Kaiapoi||Aerated lagoon, oxidation ponds and wetlands (Kaiapoi)|
|Tuahiwi||STEP||Woodend||Aerated lagoon with wetlands (Woodend)|
||38||Gravity||Loburn Lea||Recirculating sand contactor|
||21||STEP||Fernside||Recirculating sand contactor|
The Eastern District Sewer Scheme comprises of Rangiora, Kaiapoi, Pegasus, Woodend, Woodend Beach, Waikuku Beach, Pines Kairaki, Tuahiwi and Mandeville wastewater schemes. The Eastern District Sewer Scheme discharges to the Ocean Outfall in Pegasus Bay. All other schemes discharge to ground.