The aim of the study was to determine the concentration of chromium in the municipal wastewater discharged to the corporate wastewater treatment plant in Nowy Targ in the years 2006 - 2016. During the research period, 588 samples of wastewater discharged to the sewage treatment plant were taken and analyzed and specified the basic statistical characteristics concerning the chromium concentration variability in the wastewater. On the basis of the results, it was found that the mean daily chromium concentration in the discharged wastewater in the research period was 9.49 gCr·m-3 and the median was 7.90 gCr·m-3. It was found that the chromium concentrations in the wastewater increased in autumn and this state lasts until the end of December, while chromium concentrations in wastewater begin to decline from January to the end of April. Generally, chromium concentrations in the discharged wastewater appeared in the range of 5 to 10 gCr·m-3 and this was shown in 37% of the cases.