The aim of the study was to determine Oligocene and bottled drinking water as a source of sodium in everyday diets of adults. Average sodium concentration in Oligocene water samples was 118 mg/L. Sodium intake with water, estimated for the average Oligocene water consumption, amounted to 132 mg/day (7% of maximal recommended sodium intake). For the part of population with the highest Oligocene water consumption (above 90^th percentile), average daily sodium intake amounted to 220 mg and in the group consuming Oligocene water with the highest sodium concentration – to 285 mg (11% and 14% of the maximum recommended sodium intake, respectively). An average bottled water consumption was about 0.46 L/day (among consumers of this water), and 1.24 L/day among persons with the highest bottled water consumption (intake above 90^th percentile). Because average sodium concentration in bottled drinking water was related to the level of mineralization (5-148 mg/L), daily sodium intake amounted to 2-68 mg in all bottled drinking water consumers, and to 6-184 mg/day among persons with water intake above 90^th percentile. The results obtained support the claim that consumption of sodium with Oligocene andbottled drinking water should be considered a significant source of this element in a daily human diet.