Presented is the evidence concerning the groundwater and surface water quality on the territory of the settlement of Listvyanka which are used by the local population for water supply. The development of the tourism industry in the Baikal region leads to the anthropogenic impact on the Lake Baikal ecosystem and to changes in natural landscapes as well as deteriorating the state of the terrestrial and underground hydrosphere. Detailed hydrogeological sampling of 106 boreholes and wells in the pad’s and narrow valleys of the settlement revealed areas of polluted groundwater. It is established that groundwater within the Sennaya pad’ is generally of good quality and suitable for drinking purposes. In the Bannaya pad’ where the brook of the same name is the main drain, nitrate content slightly exceeds the background values. The Krestovaya pad’ showed the largest number of groundwater sources (mainly public wells) with polluted groundwater. In the Malaya Cheremshanka pad’, the waters are polluted by nitrates, and their content exceeds the requirements laid down in health standards by a factor of 1.1–2.5. In the Bol’shaya Cheremshanka pad’, increased contents of nitrates were also recorded in groundwater from one well and one borehole. Groundwater from the Berezovaya pad’ contains nitrates exceeding by a factor of 2,5–2,9 the permissible concentration. The main pollution source of groundwater is domestic sewage from the numerous hotel complexes located along the valley bottoms and the sides of narrow valleys. On the whole, the content levels of standardized components (nitrates, ammonium and silicon) in groundwater of Listvyanka do not exceed the threshold level value for drinking water.Keywords: groundwater, water chemical composition, nitrate, nitrite, phosphate, threshold level value.