Urban waste water management is a global concern. Rapid urbanization and indiscriminate use of natural resources have placed the environment under increasing stress due to human activities and population growth, and different measures are being implemented to prevent further deterioration. It is evident that, if huge volume of untreated waste water is recycled then it would reduce water scarcity and also avoids pollution in the receiving water bodies. The waste water must be considered as a resource and it must be effectively used for the betterment of eco system. In this work pollution of the Aliyar River passing through Anaimalai Town panchayat area is studied. Aliyar river emerges in the eastern slopes of Anaimalai hills of the Western Ghats in Coimbatore district at an altitude of 2250 m .The untreated wastewater from Anaimalai town panchayat is being let out to the river Aliyar, Uppar and PWD Channel. For analyzing the quality of the river, samples were collected at eight places and from the test results it was observed that the parameters such as Alkalinity, Hardness, TDS, Fluorides and Ammonia are more than the permissible limits. The values are of alkalinity are (480, 780, 580, 620, 600, 560), Hardness are (650, 440, 380, 440, 400, 520), TDS (1836, 1848, 1344, 1464, 1608), fluorides (1.5) and ammonia (greater than 5) which are greater than their allowable limits of 200, 200, 500, 1 and 0.5 respectively. So water treatment is essential and Activated Sludge Process (ASP) which is suspended bacteria consuming Bio degradable organic substance from waste water for three places and Decentralized Waste water Treatment (DEWATS) which is decentralized method anaerobic baffled reactor and Phytoremediation for Three places are proposed these methods of water treatment suggested must remove the excess chemicals in the water so that the water can be let into the river as harmless water and improves the environmental condition of the river and locality.