The work concerns the pollutant chromium compounds derived from tanning in water and wastewater the Podhale area. The main center of Podhale tanning is the town and municipality of Nowy Targ. Located in this area are around a few hundred small tanneries. Often, tanning wastewater from these tanneries do not go to the sewage treatment plant in Nowy Targ, but are placed directly into sewers and surface water; as evidenced by studies showing the late autumn and winter pollution of chromium compounds in the upper Dunajec catchment. This is the period when production in tanning plants reaches its maximum. The Dunajec catchment in the river and the Czorsztyński Reservoir occurs from periodic accumulation of chromium in the bottom sediments.

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