Onsite wastewater management systems (OWMS)
If you live in an area that does not have a reticulated sewer system, you will need to have an onsite wastewater management system (OWMS) on your property. Onsite wastewater management systems
https://www.ecan.govt.nz/your-region/your-environment/water/wastewater/onsite-wastewater-management-systems-owms