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The study involved monitoring tap water quality in a selected distribution system of 150 kilometers. The
study aimed to identify changes in tap water quality during transport to the consumer's tap. As part of
the monitoring, the physicochemical quality of water (including the content of metals such as Zn, Fe,
Mn, Ni, Cr, Cd, Cu, Pb) was assessed and the stability of the analyzed water was determined. Water
quality was monitored at the outlet of the water treatment plant (WTP) and three collection points
(POU). The results indicate that the water quality at each monitored point meets the standards for
drinking water and its quality does not deteriorate during transport through the distribution system. The
analyzed water was characterized by physical stability (turbidity <0.8 NTU) and chemical stability (the
water had non-corrosive properties with a slight tendency to precipitate sediments), but it was not
biologically stable (inorganic nitrogen > 0.2 mg N/L, phosphates > 0.01 mg P-PO4
3-/L and BDOC >
0.25 mg C/L). Bacteriological control of water did not reveal the presence of Escherichia coli. Higher
concentrations of Zn, Ni, Cu, Cd, and Pb were observed in consumer taps than in WTP.
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