The supply of quality drinking water in the religious city of TOUBA remains a major challenge for the state and local authorities. The aim of this study is to assess the hydrochemical quality of the Maastrichtian aquifer located in the TOUBA hydrogeological basin. Specifically, the study focuses on fluoride and dry residue concentrations. We worked with hydrogeological data received from the Water Resources Management and Planning Department from 54 boreholes that tap the Maastrichtian in Touba and the surrounding area. The results show that in the area, the quantity of dry residues and the concentration of fluoride are high, even exceeding the threshold set by the WHO in some boreholes. Fifty-two (52) out of fifty-four (54) of the boreholes studied, i.e. 96.3%, have a dry residue concentration above the WHO limit value (1000 mg/L), and only ten (10) of the 54 boreholes studied, i.e. 18.5%, have a concentration below 1.5 mg/L (WHO standard). Consumption of this water without prior treatment may constitute a public health problem in TOUBA.
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