Abstract
Water is a natural resource essential for life and their contamination are a major risk to public health, in addition to causing many environmental problems. This study aimed to evaluate the presence of Pseudomonas aeruginosa, total coliforms and Escherichia coli, from water to public supply of the city of Pelotas/RS. Twelve samples of raw water and twelve of treated water were collected at the Santa Barbara’s Water Treatment Station. Analysis for P. aeruginosa was realized by multiple tube technique, and detection of total coliforms and E. coli was realized by chromogenic substrate method (Fluorocult and Colilert). About raw water samples, 91.7 % indicated growth of P. aeruginosa, E. coli, and 100 % of samples presented positive contamination by total coliforms. Samples of water collected after the treatment did not show any bacterial growth. Results indicate that the treatment system was effective to eliminate the undesirable and pathogenic bacterial. Therefore, the treated water distributed in Pelotas complies with bacteriological parameters established by legislation.
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