Due to more and more increasing role of pollution surface waters in environment - particularly in populous regions - in this paper the problem of the influence of the town of Nakło city on purity of the Noteć river has been presented. Hydrochemical investigation of the Noteć river in the region of the community Nakło indicated II and III water quality classification. The town of Nakło discharges very much pollution into this river. In spite of recent certain improvement in comparison to 1993-1995 years the annual amount of pollution flowing from the town into the river is still too large and it is 3149 Mg of suspended matter, 266 Mg of nitrogen and 69 Mg of phosphorus.