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The quality of bottom sediment is important for the condition of aquatic environments. High levels of potentially harmful components in sediments negatively affect the quality of surface water environments. Lake bottom sediments are commonly used to control the quality of the environment in terms of both heavy metals and harmful organic compounds. This paper presents new data on the compositions of bottom sediments from Sołtmany Lake, located in the Masurian Lake District (Poland). The aim of this study was to determine the physicochemical properties of bottom sediments and to assess their quality based on geochemical and ecotoxicological criteria. The field study was conducted in July 2021. Thirty sediment samples were collected for analysis from six study sites located in the upper central and lower part of the reservoir. Contamination of the bottom sediments with trace metals was determined on the basis of the geoaccumulation index (Igeo), while an ecological risk assessment was carried out on the basis of calculated values of TEC (Threshold Effect Concentration) and PEC (Probable Effect Concentration) indices. The study shows that the concentration of trace metals in sediments was characterised by slight variation and that the maximum values did not exceed: 1.1 mg·kg⁻¹ for Cd, 8.7 mg·kg⁻¹ for Cr, 10.9 mg·kg⁻¹ for Cu, 7.7 mg·kg⁻¹ for Ni, 12.9 mg·kg⁻¹ for Pb and 52.3 mg·kg⁻¹ for Zn. The analyses further showed that the concentration of trace elements in the sediment surface layer increased in the following order: Zn > Pb > Cu > Ni > Cr > Cd. The maximum pH value of H₂O was 7.1, while that of KCl was 7.0. The maximum values of C_org, N_tot, P₂O₅, K₂O and Mg were, respectively: 6.1 g·kg⁻¹, 1.4 g·kg⁻¹, 40.2 mg·100 g⁻¹, 31.2 mg·100 g⁻¹ and 35.1 mg·100 g⁻¹. The assessment of the degree of lake pollution is essential for the conservation of biodiversity and the organisation of environmental management activities. Full article