The concept of common effluent treatment plant has been accepted as a solution for collecting, conveying, treating, and disposing of the effluents from the industrial estates. The effluent include industrial wastewaters and domestic sewage generated from the estate. This CETP concept helps small and medium scale industries to dispose of their effluents. Otherwise it may not be economical for these industries to treat their wastewaters or there may be space constraints. Some of these industries may require to give preliminary treatment (for removal of solids) so that the receiving sewers can be maintained free flowing. It may be required to correct pH or removal of specific pollutant before the industry discharges in CETP.