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Between August and December of 2003, chemical parameters of source where water-course called ,,potok z Wapnicy” is springing, have been investigated, as well as waters along the course of mentioned stream in Trzciagowska Valley on Wolin Island within the protection buffer zone of Wolin National Park. 25 physico-chemical indicators of water quality were measured with 17 from register of indicators designed to official evaluation of inland freshwater quality. The applied indicators enabled to elaborate the shortened classification of waters in study. The outcomes of researches carried in 2003, have been compared to similar studies from 1991 (waters of II purity class). The comparative analysis showed considerable degradation of waters from stream ,,potok z Wapnicy” classifying it beyond the class range.
Key words: freshwater, water quality, source, water-course, stream, Wolin Island, Trzciagowska Valley, Wolin National Park