Evaluation of the physicochemical and bacteriological quality of drilling water in the Commune of the 7th District in N’Djamena city

This study was carried out in the commune of the 7th District of the city of N’Djamena on the physicochemical and bacteriological quality of water from manual drilling. In total, ten boreholes were taken in ten districts of the said District. On each sample of drilling water taken, seven physicochemical parameters were analyzed, namely temperature, pH, conductivity, turbidity, Nitrates, Ammonium and Iron and four bacteriological parameters in occurrence, E. Coli, fecal coliforms, fecal enterococci and total aerobic mesophilic flora. It appears from these analyzes that on the physicochemical level, very high values were recorded for turbidity (9.33±0.15 NTU, 25.2±0.1 NTU and 34.63±0.49 NTU), on iron (1.16±0.005 and 5.41±0.25 mg/L) and on ammonium ions (0.6±0.15 mg/L and 0.7±0.057 mg/L). On the other hand, on a bacteriological level, most of the water was contaminated with E. Coli, fecal coliforms and total aerobic mesophilic flora. In view of these results, the consumption of this drilling water without prior treatment would expose the population of the 7th District of the commune of Ndjamena to contamination of bacteriological origin. To do this, awareness-raising work among the owners of these boreholes is necessary to warn them of the health risk they run because these borehole waters do not comply with the directives of the texts in force.