The aim of this paper was to identify and assess the variability of water consumption and to determine the coefficient of daily irregularity in the analysed household located in the southern Poland. The study was carried out in autumn and winter, based on daily water meter readings. Measurements were taken in a household located in the town of Lubaczów, in the Podkarpackie Voivodeship, in the Lubaczów district. The collected measurement data were collated and subjected to a detailed analysis, taking into account the variation of water consumption in the context of seasonality (season of the year), days of the week, as well as the variable number of people actually staying in the household on particular days. The results obtained were compared with the standard values set out in the Regulation of the Minister of Infrastructure of 14 January 2002 on average water consumption standards (Journal of Laws 2002 No. 8, item 70), as well as with the average water consumption in households in other localities, which made it possible to assess the compliance of actual water abstraction with the regulations in force and to estimate any deviations from the reference values.