More detailed information was published by the Institute of Colloid and Water Chemistry in Kiev.

Fortunately, nitrate  concentrations (NO3-N in the figure below) are usually low, the same is true for the organic load of this water (Hoffmann, M., unpublished data). But exceptions are possible (see SAC254nm in the figure below) - at least for some time. The reason for this is not always known.

The wells are officially controlled, but nevertheless, pollution already occurs and is not always detected. In a few cases,  chlororganic compounds (up to 300 microgram AOX per litre - see figure!) have been detected in former years. As long as they have not yet been identified, one has to take into account that they are dangerous or even very dangerous for human health. To get an official statement on the possible occurrence of those compounds, you should ask the city water authorities, Vodocanal and "SanEpidemStanzije", (SES).
Latest measurements in June 2000 showed that the problem still existed, the concentrations of chlororganics were however smaller than in former years.

The contamination of these water resources, because of more and more holes having been drilled into the underground (and possibly because of sewer leakage), is not  acceptable at all and would have been possible to avoid or at least to be minimised. The water authorities should recognise their responsibility for this fact. The official controls should include chlororganic and other toxic organic compounds and not only harmless substances like sulphate, carbonate etc. the concentration of which is indicated on tables as mentioned above. This could perhaps help to regain the trust of the consumers.

Nevertheless, problems of tap water quality have to be solved in the water work (rather than drilling more and more holes)!!!