In our country, in addition to economically significant costs of wasting water, which the government should pay, and our country has limited water resources. Therefore, identifying ways of occurrence of water losses and providing solutions to these problems will be a great challenge for the newly created water and wastewater industry in the country. The main objective of this review is to prove the high-water waste in Isfahan water distribution networks and to obtain its amount and provide methods for identifying and reduction its bad effects. In this review, the annual water balance method has been used to calculate non-accounted water, it means the difference between water production and consumption. Finally, the most important reasons for water loss at pilot points are the failure plan and the inaccuracy of subscribers’ water meters, burnout of pipes, installations, faucets and the lack of proper design of the water distribution network and unauthorized branching. According to the research carried out in this research project, the amount of not considered water in the scope of the project was approximately (33.6%) and in the villages of Senete complexes, Yazebolaghi, Ghamlu and Alyverdi were 33.8%, 33.7%, 33.9%, and 33.9% respectively.
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