Boa Vista city, capital of Roraima State it is located on the right margin of Cauamé river and on the right margin of Branco river, this last constituted by the joint of Tacutu and Uraricoera rivers, and it is crossed by Grande Brook, Caxangá, Mirandinha and Caranã brooks, being these water streams the object of our study. The city developed from the right margin of Branco river and its later development toward the tributary streams of that river, caused the human activities to interfere greatly in their natural formation, like removing the ciliar woods along the brooks, pouring non treated domestic dejections into them and canalization of their river beds. From this finding out, it was verified to be necessary to evaluate the superficial water quality in Boa Vista, aiming to help is management. In order to obtain this, it was used as multivariate tool the Principal Components Analyses - PCA and Hierarchic Cluster Analyses - HCA, as well as Water Quality Indicator.
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