The basis for the desing of water supply devices is knowledge of the distribution of water demand. The purpose of this work was to determine the structure of water demand for selected building objects. Differences between real and literature values of water flow and water demand were determined. On the basis of the analysis, water meters were selected and peak factors were determined. The analysis was performed based on current legal acts, technical literature, and data obtained from Dabrowskie Wodociagi Sp. z o.o. in Dabrowa Gornicza, Poland.