The radium isotopes ²²⁶Ra and ²²⁸Ra were analyzed in surface water at six points in the neighborhood of a mine of phosphate, associated with uranium, in the region of Santa Quitéria, state of Ceará, Brazil. Water samples were collected during twenty months, filtered and the concentrations of activity determined in the soluble and particulate phases. The results were analyzed using the Principal Component Analysis (PCA) for ordination of environmental data, and also by ANOVA, Tukey and Z tests to compare sets of data considering the radionuclides, the two analyzed phases and the six collecting points. The PCA identified four groups that included all collecting points, using aggregation features such as radionuclide and analyzed phase. The first group is composed by the samples of ²²⁶Ra in the soluble phase; the second group by samples of ²²⁶Ra in the particulate phase; the third one by ²²⁸Ra in the soluble phase, and finally, the fourth group by ²²⁸Ra in the particulate phase. This last group has two discrepant points (01 and 06). Statistical analysis identified differences between the concentrations of activity of radionuclides (²²⁸Ra higher than ²²⁶Ra) and in analyzed phases (soluble phase higher than the particulate one) but showed no differences between sampled points.