Fig.1. High level of insolation, scarce hydric resources and rare rainfall, poorly distributed over time, cause long periods of drought. Thus, the relative shortage of superficial hydric resources, makes evident the importance of subterranean waters. The exploration of these waters is found to be limited because of the nature of its soils (predominantly crystalline), low discharge rate (mean of 3000 l/h) and mainly its quality. The great majority of the wells present
higher salinity indices than the maximum limit permitted for human consumption, which is of 1000 ppm of dissolved total solids and in many cases above 6000 ppm, the extreme water salinity level for animal consumption. Another aggravating factor that makes the solution to the problem of water supply difficult is the low index of rural electrification in the Northeast.