Hydrochemcial research conducted from January 2007 to December 2010, and microbiological analyses performed from January 2007 to December 2009 included 12 streams in three areas of Małopolska Province, in which construction of small water reservoirs has been planned. Water samples were collected from the streams in measurement-control points situated on the sites of planned dams. Stream water suitability for domestic water supply was determined on the basis of 22 indices, including 20 physicochemical and two microbiological ones. In regards to regulations, it was concluded that water in 10 analyzed streams fulfilled the requirements for domestic water supply. Waters in all analyzed streams in the vicinity of Jordanów were classified as category A2 – requiring standard physical and chemical treatment. Waters in the streams in the area of Ryglice reveal a lower usability for domestic water supply because of their metal concentrations (manganese – A3 category, iron – A2 category) and microbiological indices (A2 category). In the Kraków neighborhood, waters of the Wilga and Szczyrzawa streams are in the same category due to the same indices as waters from the Ryglice area. The Sudół and Sudół Dominikański streams that flow through the suburban Kraków area carry strongly polluted waters that cannot be used for potable domestic water supply.