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The assessment of the influence of urban surface runoff on the quality of river water in the city of Brest was made. Surface runoff was studied in two phases (winter and summer) for the following parameters: pH, total suspended solids (TSS), concentration of chloride, nitrate, phosphate and ammonium ions, total oils. The results show that urban surface runoff is an important source of pollution for river waters. The components of primary concern were TSS, chloride, phosphate and ammonium ions during the winter period; phosphate and ammonium ions and oils during the summer period.