Water is considered a basic essential for the existence of all living things on earth. Due to the increasing in concentration of heavy metal in water, it is highly harmful for human life. Arsenic is a major contaminant that is present in water due to natural and anthropogenic activities, that threatening the human health and encouraging the dissemination a number of diseases such as inflammatory and neoplastic changes of skin, respiratory system and reproductive system. In the meantime, hundreds of individuals are currently defenceless from this ground water with absorption of the contamination which is greater than its permissible limits. Many of techniques are used to remediate the toxic level of arsenic in water. Arsenic removal done by mainly using two major filtration techniques, which are the, membrane processes- nano filtration (NF) and reverse osmosis (RO). The appropriate techniques must be used in order to fulfill the World Health Organization's (WHO) guiding principle when removing arsenic from drinking water. Based on the results of many investigations, membrane filtration can effectively remove substantial quantities of toxic metals, such as arsenic, at a pressure while still generating high quality water that reduced operational costs. The removing of both kind of the arsenic over a high pressures and pH range is considered to be possible using RO membranes, which are yet another effective membrane technology. In these filtration methods, membrane clogging must be considered as a limitation; however, given the potential for the changing through the proper use of pretreatment and also considered advantages like as the lack of chemical use, insufficient production of sludge, efficiency in removing up to the permissible limit of WHO, and removing a high range of pollutants, they recommend to remove certain contaminants in contrast to another methods.

Keywords: Heavy metals, arsenic, humans, health, environmental pollution, plants growth.