The work aimed at the assessment of working of a household sewage treat-ment plant based on a horizontal flow sand filter.Physicochemical analyses of chosen pollution indexes (BZT5, ChZTCr, total suspension, total phosphorus) were carried out and compared with currently in force values of these indexes according to the Regulation of the Minister of the Environment of 24th July 2006. On this basis the operation of the sewage treat-ment plant was assessed. Raw, initially treated and treated sewage samples were taken from December 2008 to March 2009. Physicochemical analysis was carried out in the Laboratory of the Department of Sanitary Engineering and Water Man-agement of the University of Agriculture in Kraków. The gathered results of tests and their analysis conducted in the paper showed the proper working of the household sewage treatment plant.
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