Water is an essential resource for life on earth, and is involved in many aspects of the environment and human life. It is therefore important to protect it. The aim of this study is to assess the level of microbial and physico-chemical pollution and the degree of hydrological disturbance in the waters of the Djoliba River in the commune of Kouroussa (Republic of Guinea) over the last ten years (2014 to 2024). To do so, methods spectrophotometric analyses of samples I and II were carried out and have shown more or less satisfactory results in relation to the presence of heavy metals and mineral elements in samples I. However, the presence of coliforms in samples KPE2 and KBRIQUETERIE was 126 and 124 respectively. For sample II, contamination is widespread and exceeds acceptable total coliform thresholds. Particle size analysis reveals a mixture of medium grains with a very narrow S, shaped particle size class, unsorted homogenous material transported into the watercourse at short intervals. According to a study by the Max Planck Institute for Marine Microbiology in Bremen, grains of sand are home to thousands of bacteria. The hydrological study showed that the river has experienced disturbances in the years 2021-2024 as a result of human aggression.
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