Despite the abundance of sand mining sites observed in Cameroon and especially in the Western region, the recognition of the granular properties of these building materials remains a major issue for local builders. This study focuses on the characterization of granular properties of Nepenet sand. On-site sand samples were subjected to laboratory tests to determine their granular properties. Analysis results show that sands are clay (SE≈65<70%) and medium sized (2.53.6<3.5%) with negligible improvement in their cleanliness (SE≈70%). These natural sands are therefore not recommended for concretes. However, treatment by mechanical washing can make them suitable for concrete of good resistance to the detriment of the ease of implementation. Thus, the improvement of the quality of the sand lies in the installation of a washing device in order to make these materials cleaner.