[Bacterial pollution with Campylobacter in surface waters of water-plants after different steps of water processing]

The presence of bacteria of Campylobacter genus was investigated in 55 samples of surface water taken from Vistula river nearby Warsaw, and from different stages of water processing plants in Central and Northern water plants. For this purpose the membrane filters technique in microaerophilic conditions and differential medium with the antibiotics addition were used. Bacteria of Campylobacter genus were detected in 36% samples of surface waters and positive correlation with the contamination with coli of fecal type bacteria was found. The presence of Campylobacter was also found in water intakes in Central and Northern water plants and in water samples taken from sediment trap after fast filters and coagulation in Central water plants. No Campylobacter type bacteria were found in chlorinated water containing of free chlorine in concentration of 0.66 mg Cl2/l.