Establishment of protected areas requires actions aimed at preservation of natural qualities of the objects occurring in the areas to be protected. The paper describes hydrochemical conditions and trophic status of lakes Binowo (Binowskie), Glinna, and Szmaragdowe, the largest water bodies in the Szczecin Landscape Park. The study was conducted in 1997-1998. The lakes were found to differ in their water mass dynamics: while Lake Szmaragdowe was bradymictic, water dynamics of lakes Glinna and Binowo placed them among eu- and polymictic reservoirs, respectively. The oxygen regime, organic matter load, and nutrient contents found are indicative of a considerable fertility of the lakes studied. The Binowo and Glinna should be classified as strongly eutrophic. Although Lake Szmaragdowe can be regarded as mesoeutrophic, its water quality is steadily deteriorating. In terms of the lake monitoring system standards, water of the Binowo and Glinna should be considered as belonging to quality class III, the Szmaragdowe being placed in quality class II. To stop further degradation of lakes Binowo and Glinna and to retain their recreational value, it is necessary to upgrade sewage management practices within the catchment and, foremost, to stop direct discharge of municipal sewage into the two lakes.

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