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The studied area is 1960 km2 and located in Zanjan province and is placed between 48º, 48´ to 49º, 30´ east longitude and 35 º, 57´ to 36º, 36´north latitude. Human pollutants are mainly home and human sewage which is discharged by absorbent wells that seems to be one of the best ways of discharging sewage. On the other hand in the places where the underground water recharge the river, there is a possibility of having some environmental problems in the nearly future.Presently, the amounts of BOD5 and COD are due t...