Wastewater Flows from Perth and Mandurah
In 2007 the Water Corporation treated 120 gigalitres (328 megalitres a day) of wastewater in metropolitan wastewater treatment plants. This means that about 44% of all water supplied to customers from the IWSS water grid is fed back into the Water Corporation’s wastewater systems. Hence, the amount of wastewater that enters the system is dependent on the amount of water consumed by households, business and industry.
Wastewater comes from:
- homes (65%); and
- businesses (35%).
Businesses are a mix of commercial premises such as shops and offices, as well as industrial premises. Commercial premises produce smaller amounts of wastewater, similar in nature to residential wastewater. Industrial wastewater is closely monitored by the Water Corporation to ensure toxic compounds do not enter the wastewater system.