This water problem in our rural environments pushes us to evaluate how the use of geophysical methods in the crystallophyllian basement with a view to studying drilling data to investigate the subsurface in order to delimit the potential of groundwater in the crystallophyllian base, from the territory of Lubao, Province of Lomami in the DRC. The study area is surrounded by tributaries and water sources among others (the Kamina, the Tshisanpa, the Mitonga, and the Lufubu) of the Lomami basin whose water is generally of poor quality, requiring adequate treatment which is not guaranteed. The area concerned by our study is characterized in the central part, Cretaceous sedimentary lands of Mesozoic age (Loïa Formation indicated above), composed essentially of soft sandstones with intercalations of argillite, separating them into different levels aquifers. These are subhorizontal tabular terrains, laterally homogeneous, containing confined aquifers, flowing into the valleys. The water is of good quality, alkaline (pH = 6.5), weakly mineralized and with low hardness... Using geophysical methods (magnetotelluric) we carried out our study by carrying out several profiles including 7 (seven) were favorable in the area. The Lubao aquifers are essentially underlying sandstones and limestones, which means that prolific aquifers are absent. However, the main water resource lies in the limestones and sandstones, the first water sources of which are at 30m. The vertical results of the electrical surveys gave dominant 4 geoelectric layers. The underlying rocks correspond to an altered upper soil; Not all declined areas are prolific. Farm aquifers exist at different depths which vary between 150 and 180m. The data collected and processed by sites show the possibility of capturing groundwater in sufficient quantity in the fissures and Karst. Geoelectric prospecting by Magnetotelluric surveys does not give any quantitative information on the significant exploitation flow by drilling, but rather indicate the location (the favorable point) for carrying out water drilling.