TY - JOUR N2 - The work is an attempt to assess piped water quality in four counties located in east central Poland. Piped water was analysed for three successive years in each county. Water samples were tested for the following physical and chemical parameters: turbidity, colour, conductivity, taste, odour, pH, nitrates (III), nitrates (V), iron and manganese. They were compared with the current standard values. Preliminary data analysis included an analysis of maximum and minimum values of physical and chemical parameters, and it revealed that turbidity, colour, iron and manganese contents exceeded the permissible standards in all the counties. Percentages of parameters exceedances and mean values of the exceedances were used to rank the counties in terms of water quality. The ranking was obtained by means of multidimensional comparative analysis. It was demonstrated that best quality water was supplied by Węgrów County water supply system which was followed by Mińsk Mazowiecki County. The third rank was assigned to Łosice County and the poorest quality water was found to be supplied by Siedlce County water supply system. L1 - http://journals.pan.pl/Content/86115/PDF/10265-Volume41-Issue4_paper_10.pdf L2 - http://journals.pan.pl/Content/86115 PY - 2015 IS - No 4 DO - 10.1515/aep-2015-0043 KW - drinking water KW - water quality parameters KW - multidimensional comparative analysis A1 - Radzka, Elżbieta A1 - Rymuza, Katarzyna A1 - Jankowska, Jolanta PB - Polish Academy of Sciences VL - vol. 41 DA - 2015[2015.01.01 AD - 2015.12.31 AD] T1 - The assessment of drinking water quality using zero unitarization method UR - http://journals.pan.pl/dlibra/publication/edition/86115 T2 - Archives of Environmental Protection ER -