Natural radionuclides have been surveyed in Finnish groundwaters using alpha/beta liquid scintillation spectrometry since the late 1980s. Until now, gross alpha and gross beta have been determined in more than 11 000 samples by this technique, which has created significant savings in labor costs compared to previous gross alpha and gross beta methods based on using ZnS scintillation counters and low-background β-ray counters. The sample preparation method is now much easier and large samples series can be counted automatically. The main savings are, however, achieved by measuring the α-and β-ray spectra on a low-background liquid scintillation spectrometer, which provides valuable information on the occurrence of the long-lived α-emitting (238U and 234U, 226Ra and 210Po) or β-emitting (40K, 210Pb, and 228Ra) nuclides in water. The α-ray spectrum allows calculation of the uranium and radium contents in most groundwater samples quite accurately, and thus expensive radiochemical analyses are avoided. The concentrations of radon, gross alpha, and gross beta are determined from all drinking water samples delivered for radioactivity measurements. The gross alpha and gross beta are mainly used to screen whether the levels of long-lived nuclides exceed the limits set in the regulations.