If we live in a larger urban area it is likely that management of our household wastewater is taken care of by the Council, with a reticulated sewer system outside our front gate. However, there is a significant proportion of our population (maybe about 850,000) who live without a Council sewer service. These people have to take responsibility for managing their own household wastewater within the boundaries of their property. This type of service is generally described as an on-site wastewater management service (OWMS). Such services are required to comply with the local regulations administered by Regional and Territorial Councils.