woda studzienna pitna bakterie Enterobacteriaceae

Legionella spp

The objective of the study was the bacteriological evaluation of the quality of drinking well water drawn by the traditional method and by means of pumps, with particular consideration of bacteria of the Enterobacteriaceae family and Legionelaceae. The study covered 36 water samples taken from household wells in the villages of the eastern area of the Lublin Region. From half of these wells the water was drawn manually, by means of a roller and bucket, while from the second half - with the use of electric pumps and household water supply systems. The studies were conducted by the membrane filtration method. The following media were used: soya agar, EMB (selective for the determination and isolation of bacteria of Enterobacteriaceae family), CIN (selective-differentiating for Yersinia type of bacteria), basic BCYE for Legionella, supplemented with growth and selective supplements (GVPC). Drinking water from the household wells examined was contaminated with Gram-negative bacteria of the Enterobacteriaceae family, other bacteria, mainly of the Pseudomonadaceae family, as well as of the Acinetobacter, Aeromonas, Chromobacterium, Legionella and Vibrio species. The results obtained suggest that the method of drawing water from wells and its distribution exerts an effect on the bacteriological quality of this water. Water from household water supply systems contained a richer spectrum of bacteria of the Enterobacteriaceae family, and other bacteria, compared to water drawn manually from the well. Analysis of the up-to-date results and those previously published indicates that water from household water systems is exposed to all types of risks typical of well water and that from water supply systems