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Tap water quality in Wroclaw, Poland was tracked by a two-year monitoring. Samples were taken in 175 points and subjected to multi-elemental analysis. Randomly selected samples underwent microbiological purity assessment. The composition was also compared with bottled waters available on the market. The determined concentrations of macro- micro- and toxic elements plus microbiological purity allowed for the evaluation of tap water quality. We compared our results to WHO, EPA and Polish standards, showed individual exceedances of acceptable limits and demonstrated the microbiological purity of water in Petri-dish tests. The comparison of the composition of tap water with eight types of bottled mineral and spring water showed similar or slightly higher concentrations of macro- and microelements in the former. The impact of home filters on water quality was also examined. On this basis, it was concluded that tap water in Wroclaw, Poland, can be recommended for direct consumption.

Quality of tap water in an urban agglomeration: 2-years’ monitoring study in Wrocław, Poland