The impact of anthropogenic activities on the quality of groundwater of the Mzamza community (Chaouia, Morocco)**
The study of the physical-chemical characteristics of groundwater of the Mzamza community, subjected to domestic and industrial wastes from Settat City (Morocco) via the Boummoussa river, shows that the quality of water of the various wells is variable and depends on a certain number of factors such as the location of the wells in relation to waste water and agricultural activity. The interpretation of analyzed data, the correlation between waste water and well water, and the distribution of groundwater sites into groups was carried out using Normalized Principal Components Analysis. The study revealed several sources of groundwater contamination, namely, the contamination by organic matter due primarily to the infiltration of waste waters used for irrigation, and the return of irrigation water (loaded with nitrate fertilizers), which is regarded as being the principal source of dissolved solids and inorganic nitrogen in the groundwater. Several factors influence the progression of this pollution: the concentrations of the pollutants in the waste waters, the nature of the soil, the lithology, the permeability of the aquifer in use and the depth of the water table. The results achieved in this study also revealed the paramount influence of seasonal variability and the beneficial role of atmospheric precipitation.