When water is used once and is no longer fit for human consumption or any other use, it is considered liquid waste. Proper disposal, treatment and reuse of wastewater wherever possible will help in combating diseases as well as meeting water scarcity. The selection and adoption of appropriate technologies plays a very important role in this whole exercise and has far-reaching implications on the success in achieving a circular water economy. The selection of technologies is even more important. New concepts are continuously being added to achieve a sustainable society, focusing on the new tool of circular economy. Various reuse options of waste; either water or solids (e.g., agricultural irrigation, industrial process recycling, resource recovery, biogas production etc.) as part of a circular economy, are being identified and tested.