Relevance. Sources of non-centralized water supply such as wells and springs are still popular even in large cities. At the same time, water from these sources may contain significant concentrations of pollutants including natural radionuclides. The article presents the results of a 1.5-year monitoring of Rn-222 activity concentrations in seven springs near Ekaterinburg as well as activity concentrations of U-238, Ra-226 and Pb-210 in water of these springs. Methods. Activity concentrations of Rn-222 were determined via gamma spectrometry, U-238 was determined by ICP-MS; both analyses were performed without sample pretreatment. Ra-226 and Pb-210 were analyzed in accordance with radiochemical methods including a radionuclide preconcentration from 5 - 10 L water sample, purification, source preparation and measurement. We have performed analysis of the Pb-210 specific activity according to the methods developed by TrisKem International (France) based on selective isolation of Pb-210 at extraction/ chromatographic resin based on crown-ether. Results. It was calculated that the contribution of Rn-222 to the annual internal dose exposures was 98.3 - 99.8%. Thus, radon monitoring is a priority for evaluation of radiation safety of underground drinking water sources.