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investigation, Staphylococcus aureus was isolated on three separate occasions. Probably, the 
observed occurrences underestimate the real abundance of this bacterium because its successful 
isolation might have been prevented by the intensive growth of other bacterial forms. The 
different time periods of occurrence of higher numbers of faecal streptococci in comparison to 
coliform bacteria and the total number of bacteria should be also pointed out. A decrease in the 
total number of bacteria, coliforms and staphylococci took place earlier in time (a peak of 
abundance on July 24, 1997, followed by a noticeable decrease), while the highest numbers of 
faecal streptococci were observed much later, that is, on August 1 and 2, 1997. This 
phenomenon may be explained by better survival of streptococci in water. The bacili of 
Salmonella were not detected in any of the collected samples but Pseudomonas fluorescens, 
Pseudomonas aeruginosa were isolated. 
Conclusions 
The impact of flood waters on sanitary condition of the sampled sea water can be described as 
significant, however, its extent in reference to particular parameters of the pollution level was 
definitely variable. The following are the main conclusions: 
1. in reference to the number of faecal coliform bacteria, a deterioration of sanitary condition 
of water during the period of investigation was observed, based on a comparison to its 
average status, as assessed by calculating the yearly means of all measurements. Although, 
it should be stressed that the values of faecal coliforms MPN measured during the duration 
of the study did not exceed the highest values of the indicator obtained from systematic 
monitoring. 
2. in reference to such parameters as, total bacteria number, the indicators of faecal 
streptococci and staphylococci, the level of sea water pollution within the investigated area 
was several times higher than in previous years.