The concept of sustainable wastewater treatment is aimed at ensuring security of water resources and reducing environmental impact. The current systems are more concerned with energy saving, recovery of resources and minimized usage of chemicals. State of the art technologies are used to eliminate contaminants, aid water reuse and reduce carbon print. With the increase in populations, the question Is Wastewater Treatment Sustainable? takes centre stage in the urban planning and industrial processes. A cost-benefit, energy requirement, compliance and long-term ecological outcomes are key factors to consider when developing strong and resilient waste treatment systems of the future.