Every human being needs water for all their purposes and generates wastewater after the usage. The regulatory agencies are stringently forcing the local bodies, industries, and major organizations to control the quality of wastewater before discharging into the environment. Hence the necessity arises to treat the wastewater before it is discharged. The authority and the planner must know the various parameters and characteristics of wastewater, the constituent present in it and method of treatment technologies available before designing the treatment plants. There are various methods available for wastewater treatments like Activated Sludge Process, Trickling Filter, Extended Aeration Sludge Process, Aerated Lagoon, Oxidation Ditch, Waste Stabilization Pond, Up-flow Anaerobic Sludge Blanket, Membrane Bio-Reactor, Moving Bed Bio-film reactor, Sequential Batch reactor and Rotating Biological Contact-discs. In this paper, a comparative study has been carried out to evaluate the performance (like Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand, Total Suspended Solids and other main constituents), installation, operation, maintenance cost comparison for the Activated Sludge Process(ASP) and Extended Aeration Sludge Process (EASP) is taken up to control the discharge limits. The average test results showed that the removal efficiency of BOD and TSS from the domestic wastewater in EASP is more than 96% and superior compared to ASP technology.