Quality of water or wastewater is very important considering both use and disposal. To check the quality of water or wastewater various parameters are available but for common people it is difficult to understand all the parameter. In 1970s concept of Water Quality Index (WQI) has been developed for easy understanding of quality of water by representing it as numeric value i. e. 0 (Poor) to 100 (Excellent). WQI has become an important decision making tool for authorities. In the same line development of Wastewater Quality Index (WWQI) will become an important tool for authorities and easy to understand for common people. Different methodologies are available for determination of WQI. This paper is attempted to discuss the various methodologies of WQI, which can be used for determination of WWQI as well as concept of model and its consideration.

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Water Quality Index (wqi) Wastewater Quality Index (wwqi) Important Tool