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Cluster and Factor analysis were performed on 55 well representative groundwater samples gathered from the open files of the Water Authority and samples during 2011.The collected samples were analyzed for a total of 12 water quality descriptors (variables) including pH, EC,TC,TDS, Ca, Mg, Na, K, CI, HCO3, SO4 and NO3. The study finds that a two-factor model is suggested, it explains over 79.8% of the total groundwater quality variation. Factor 1 includes concentrations of EC, TDS, Na, K, Ca, Mg, Cl ,HCO3, SO4 and NO3. Factor 2 includes TC and PH. Qmode cluster analysis demonstrated that there are two main hydrochemical groups , the first group shows the similarity between NO3, K, Mg, and Na as one group ,which probably represent the effects of weathering of the rich feldspare and mica , in addition to agriculture fertilizers. The second cluster is Cl and HCO3 dominated but also contains low concentration of SO4.

Cluster and Factor Analysis of Groundwater in Mafraq Area, Jordan