Survay the Coliform pollution in the Zyarat Stream in Golestan Province

In this survey, in order to study the Coliform pollution of Zyarat Stream from surface layer were sampled in 10 stations. Sampling was done monthly in during spring and summer (1391). The Coliform pollution was examined by standard MPN method. Present results has shown significant difference among stations (p>0.05)) that the main cause of it was human,s activities while there was no significant difference among different months that the main cause of it was flood monthly that occurred. In summer, due to the high temperature, growth of bacteria is more than ever and in the lower area, because of calm flowing of water and it is passing through the city and agricultural centers, and entering garbage into it, the amount of pollution has been apparently reached a high level in comparison with other parts of the stream with rapid flowing of water.