Bathing water quality and sanitary-technical conditions on beaches are great public concern because of possibility of fecal contamination, which presents risk to bather´s health. This study were analyzed sea water quality data of beach for dogs on Kantrida, on two mandatory microbiological parameters - Escherichia coli (EC) and intestinal enterococci (EN), proposed in Regulation (73/08), and on the additional microbiological and physico-chemical parameters. Goal of this study was to analyze and estimate bathing water quality and sanitary conditions over a long period of time at respective beach. Results of routine and additional monitoring of water quality were compared on the basis of calculating the 90th percentile. Results of routine monitoring were improved following the modernization of the sewage system (since 2003.). Grades based on the results of additional monitoring are worse, because early morning and night peaks of faecal load were detected. Correlation analysis of daily mean values between examined microbiological and physico-chemical parameters in additional monitoring was conducted. Tested microbiological parameters (EC and EN) show excellent positive correlation with each other, and significant correlation with the additional indicator of faecal contamination CP. Correlated indicators of faecal contamination (EC, EN and CP) showed a negative correlation with salinity. Excellent positive correlation was observed between heterotrophic plate count at 22 ºC and 37 ºC, while other microbiological parameters showed no correlation with each other. Of the examined physico-chemical parameters, salinity and turbidity were distinguished as important indicators of pollution. Long-term studies have shown that the sea water quality of beach for dogs on Kantrida is under the influence of individual facilities disconnect to the public sewerage system, failure of private septic tanks, and the presence of active coastal springs.