Wastewater is one of the biggest menaces in the world. Around the world wastewater is produced on a large scale while a comprehensive solution to the problem has been difficult to find. Therefore, this study has been conducted on decentralised wastewater treatment. Here, the water has been purified by the use of special plants such as Cana Indica, Typha angustifolia. The study work has been conducted around six wastewater treatment plants and the procedures adopted in each of them. The procedure makes it possible to treat wastewater without use of any chemicals. The treated water so obtained can be used to water plants in plantations, farms, etc.