As a result of the analysis of the practice of drinking water integral assessment in terms of chemical safety indicators, problems were identified regarding the minimum required number of samples, the minimum mandatory list of indicators. Based on the results of laboratory analysis of drinking water quality in some towns in the Leningrad Region, risk values and integral indicators were calculated using 3 methods. According to the authors, the most realistic is the calculation of indicators based on the average values of controlled indicators for the year preceding the calculations and only at the point before being fed into the distribution network (method #3).