Zamiche, S.Hamaidi-Chergui, F.Demiai, A.2021-12-122021-12-122018-01-01S. Zamiche, F. Hamaidi-Chergui, A. Demiai. POLLUTION OF THE QUATERNARY AQUIFER OF MITIDJA (ALGERIA) BY NITRATES: ORIGINS AND IMPACTS ON THE QUALITY OF WATER FO HUMAN CONSUMPTION . Journal of Fundamental and sciences. vol.10, no 1. January 2018. university of el oued. [visited on ../../….]. available from [copy the link here]1112-9867http://dspace.univ-eloued.dz/handle/123456789/9933Artical in Journal of Fundamental and sciences. university of el ouedThe aim of the study is to evaluate the degree of contamination of the aquifer of Mitidja (Algeria) by nitrates and to determine the origins of this contamination by a statistical approach and to estimate the impact on the quality of the aquifer by the application of the Water Quality Index (WQI). The results show that the aquifer is strongly contaminated by nitrates with an average of 71.58 mg/l. These results were confirmed by the calculation of the Water quality Index (WQI) which varies between 59.29 and 190.25 with an average of 110.16, thus 60% of samples are characterized by a water of bad quality for human consumption. The Principal Component Analysis (PCA) enounce the anthropic origin of the nitrates which are regarded as chemical pollutants of permanent type and diffuse sight that their origin is agricultural.enMitidja plain; Groundwater quality; WQI: Statistical Analysis.Article