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The quality of the water is strongly influenced by the various human activities that exist around the bodies of water. In view of this, this study aimed to analyze the similarity between the water quality parameters of Lagoa Mirim, through cluster analysis. Secondary water quality data were used, namely: pH, Water Temperature, Electrical Conductivity, Turbidity, Total Phosphorus, Total Kjeldahl Nitrogen, Consumed Oxygen, Biochemical Oxygen Demand, Dissolved Oxygen, Total Solids, and Thermotolerant Coliforms. Two periods were adopted for analysis, being period 1 from January to June and period 2 from July to December 2017. Euclidean Distance and Ward’s method were used. In the first period, three groups were formed and in the second period, four groups were formed. Through the grouping for each period, it was inferred about the possible sources of pollution of Lagoa Mirim. It was concluded 1 Instituto Federal de Educação, Ciência e Tecnologia Sul-rio-grandense – IFSul, Câmpus Pelotas/RS – Brasil. E-mail: thaisnoble21@gmail.com 2 E-mail: luananunescenteno@gmail.com 3 E-mail: satolentino@pelotas.ifsul.edu.br 1 Revista Thema v.19 n.1 2021 that the clustering method was shown to be adequate to identify water quality variables with greater similarities during the studied periods.

Clusterização em dados de qualidade da água de uma lagoa localizada no Sul do Rio Grande do Sul