Water And Wastewater Purification In North Africa LAHLOU Abdelhadi, International Expert Abstract The requirements of water in the North-African countries, are exponentially increasing for various reasons of which: the too much high population increase, the irrigation which consumes 85 % of the total surface water and groundwater, the improvement of the conditions of life, the degradation of the dipole water-soil (land degradation and silting-up of large dams), the lack of study specifying a demand for judicious water for the various needs and, consequently, an optimal adapted management. In another share without the eighteen future years, Morocco, Algeria and Tunisia, will know a chronic water deficit with inescapable consequences on the socio-economic development of these countries. So a adequate water policy is to improve with the systemic use of the no conventional methods such as the wastewater reuse for agriculture, the desalting of sea waters and groundwater, the use of renewable energy, the artificial recharge of aquifers… The object of the communication is to present the current situation of water and wastewater in North Africa, their evolution in time, and the methods used in the plants of wastewater, with the experiment obtained and the recommendations for a better management… Several North-African wastewater plants are presented with their advantages and defects