Based on the results of analyzes performed at the chemical monitoring points, the physical and chemical properties that influence the possibility of using these waters as a source in heat pumps were analyzed. 2. GEOLOGY AND HYDROGEOLOGICAL CONDITIONS OF THE KRAKOW REGION Geology The Krakow agglomeration is located within three regional geological units: the Silesian-Krakow Monocline, the Miechów Trough and the Carpathian Foredeep [35]. The oldest rocks in the area of the Silesian-Krakow Monocline are Permian sandstones and conglomerates. Above them lie the sandy-clay deposits of the Lower Triassic, dolomite-lime-marly deposits of the Middle Triassic and the Upper Triassic clays. The Middle Jurassic is represented by sands, sandstones and conglomerates. The Upper Jurassic is represented by marly-limestone sediments. Middle Oxfordian is represented by platy limestones, the Oxfordian-massive limestones [23, 24]. The Pleistocene sediments are composed by clays and glacial sands, silts and clastic silts, river and glacier sands as well as river sands and gravels [19]. In the Miechów Trough in the basement there are Paleozoic rocks of the Miechów-Rzeszów region. The trough is filled with Upper Cretaceous deposits-marls, sands and sandstones, and rocks with sandstone inserts. In the southern part of the trough, the Cretaceous rocks fall under the Miocene deposits. The thickness of the Upper Cretaceous rocks in the Krakow region is 25 m, while in NE the part of the Miechów Trough reaches 600 m. In the area of the Carpathian Foredeep, the oldest rocks appearing on the surface are Upper Jurassic limestones with many silica concretions [1]. Above these rocks lies the complex of clastic silt-sand Miocene sediments that fill the Carpathian Foredeep [29, 31]. Miocene deposits in Krakow area are located at depths of 10 m to 30 m [35], their thickness depends on the basement morphology. In the elevations, the thickness is reduced, while in the hollows the thickness is from about 40 m to about 70 m [37]. Quaternary deposits fill the Vistula's pradoline. They form a series of terraces and alluvial fans of Prądnik and Rudawa [7]. These are mainly alluvial sand-gravel deposits and fluvioglacial: sands, gravels, clays, organic muds and loams of water-glacial genesis, alluvial and aeolian. Loesses (Vistulian Glaciation) is covered by slopes and horsts as well as sand deposits of the terrace of the middle Vistula valley [7]. The thickness of the Quaternary deposits ranges from 10 m to 20 m, and in river valleys even up to around 30 m [37]. There are two structural stages in the Krakow area. The Variscan stage includes Devonian and Carboniferous rocks, which were tectonized during the Variscan orogenic