SUMMARY
Water is vital element for humans. It is necessary to have quality and sufficient quantity thus ensuring a healthy and safe long term. The environmental protection is to safeguard water resources against all types of pollution. In this work, special attention is given to water resources. The objective of our work is to quantify the water resources of some sites Watershed Coastal Algiers which includes nine sub-basins. Hydrochemical study was conducted to better understand the quality of some resources in the basin. The analysis focused on a number of physico-chemical parameters such as water temperature, hydrogen potential, electrical conductivity, total hardness, Cl- ,SO42-, NO3 - ,HCO3- Ca2+, Mg2+ K+ and Na+. This study has allowed us to highlight a number of parameters that come into play in determining the quality of the water and found that the content of these elements, however, remains low and does not, for the most part, risk of major pollution of the watershed Coastal Algiers.