Review paper on water quality with relation to extreme value theory

The impairment of the quality of water is a serious and rising issue globally. The extreme impairment cases often be the main reason to unbalanced human and ecosystem impacts. It causes a very limit of resources for quality consumption and the manufacturing of food, domestic use and also damaging ecosystems. It is expected that various factors combination makes conditions suitable for terrible water quality. The aim is to find the suitable water quality parameter that is relate to extreme cases of water quality. Extreme value theory will be introduce as statistical tools for analyzing extreme data and predict future extreme occurrences based on return level.