In the present work we tested three genotoxicity assays with water collected at three different sampling points in Ljubljana drinking water region. The Ames test was performed with and without metabolic activation using bacterium Salmonella typhimurium TA97a, TA100 and TA1535 strains. The same samples were tested with the yeast Saccharomyces cerevisiae strain D7, with and without metabolic activation in Zimmermann test. Parallel genotoxicity evaluation on the samples was carried out as alkaline version of the comet assay performed with human HepG2 cell line. Original and concentrated water samples were tested in all bioassays following the chemical analyses for pesticides and nitrate. There was no indication of genotoxic activity in any of drinking water samples according to Ames and Zimmermann test. On the contrary, the results of the comet assay revealed low genotoxicity in most of the drinking water samples. As only the Comet assay proved to be sensitive enough to detect genotoxicity, we propose to include it in regular biomonitoring of drinking water.