Abstract            Volume:12  Issue-5  Year-2024         Original Research Articles

Online ISSN : 2347 - 3215 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcret@gmail.com

The city of N'Djamena, the subject of this study, is located in a semi-arid area on the alluvial plain of Lake Chad. The presence of water resources in an uncontrolled urban context increases the vulnerability of these resources to a variety forms of pollution. Stratigraphic, chemical and microbiological approaches were used to study the lithological, hydrochemical and bacteriological characteristics to determine the suitability and quality of groundwater in the city of N'Djamena. This study highlights facies variations in the superficial aquifer, influenced by climate and sediment flow. The hydrochemical characteristics of the groundwater indicate a relationship with carbonate geological formations. The chemical quality of the groundwater is within WHO drinking water standards. Bacteriological results show the remarkable presence of bacterial germs. The origin of this fecal pollution can be attributed to poor sanitation and household waste collection. Then there are the septic tanks, the conditions under which water is drawn and the structure of the borehole installations. The use of this groundwater could constitute a major health risk for the majority of N'Djamena's inhabitants, and therefore requires prior treatment before consumption.

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