The field investigations concerning water and peat bog communities on the territory of Trzebinia in 2000 revealed their little diversity caused by a small number of large water bodies and performed betterment drainages. 12 syntaxa were distinguished which represent 5 classes: Lemnetea minor is (I), Potametea (6), Utricularietea intermedio-minoris (I), Littorelletea uniflorae (I), Scheuchzerio-Caricetea nigrae (I). Among described units 3 plant associations are endangered within Upper Silesia: Myriophylletum verticillati, Hottonietum palustris, Valeriano-Caricetum flavae (montane plant association).