Liquid scintillation multivariate, gamma spectrometry and radiochemical separation techniques were used for estimating ³H, ⁹⁰Sr and ¹³⁷Cs in bore well samples. Using multivariate technique, ³H, ⁹⁰Sr and ¹³⁷Cs has been assayed in triple labeled samples. The same samples were also estimated by other routinely used techniques, like gamma spectrometry to estimate ¹³⁷Cs, radio-chemical separation followed by subsequent counting using GM counter for ⁹⁰Sr. The samples were distilled for 3H and its activity was estimated using liquid scintillation counting with the prepared calibration curve. Our results show that liquid scintillation multivariate is an easy and rapid method capable of estimating ³H, ⁹⁰Sr and ¹³⁷Cs in water samples with ±10 % deviation for ³H and ± 13 % deviation for ¹³⁷Cs. However, in case of ⁹⁰Sr the results obtained by conventional method and the simultaneous analysis by liquid scintillation multivariate technique are varying around ±29 %. This could be attributed to error introduced by matrix interference in the conventional analysis.