An OSSM is part of the plumbing system on an unsewered property, and normally includes a tank for treating raw sewage and a disposal system. Types of OSSM systems include:
- septic tanks
- aerated wastewater treatment systems (AWTS)
- greywater treatment systems
- wet and dry composting toilets
- alternative systems
These systems include sewage management facilities that treat domestic sewage from up to 10 persons with an average daily flow of less than 2000 litres.