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Seasonal analyses were carried out on the waters from 5 sampling sites situated on the Someşul Mic river, upstream the water treatment plant in Gilău. The total coliform germs and the faecal coliforms were analysed. The presence in water of the two bacterial groups was detected in each sampling site, in each season, with higher values in autumn, and lower in winter. A positive correlation with good statistical significance (p<0.01) was registered between the two groups of coliforms. In order to differentiate the genera of coliforms, 7 biochemical tests have been carried out on the water sampled in autumn at the P2 site, where the highest number of coliforms had been registered: indole production, methyl red test, Voges-Proskauer test, citrate utilization, malonate utilization, urea hydrolysis and H₂S production on the TSI medium. On the base of the results obtained from the 7 biochemical tests, four bacterial genera have been identified: Escherichia, Klebsiella, Enterobacter and Citrobacter. The three enzymatic activities studied in sediments (phosphatase, catalase and potential dehydrogenase) gave values of enzymatic indicators of sediment quality slightly lower than those registered by other researchers five years earlier.

Keywords: Someş river, coliform germs, faecal coliforms, enzymatic activity