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Aims: to assess the quality of drinking water using microbiological indicators and to assess epidemic risks of water-born infections in urban settings of the Arkhangelsk region. Methods: Secondary data on standard sanitary and hygienic assessments of the quality of centralized drinking water supply in Arkhangelsk, Severodvinsk, Novodvinsk, Kotlas and Koryazhma for 2006-2016 were used. Assessment of the microbial risk of water-born infections was performed. Results: All towns except Severodvinsk had moderate risk of water-born infections through centralized drinking water supply system. Arkhangelsk had 56 points while Kotlas, Novodvinsk and Koryazhma had 37, 30 and 19 points, respectively. Severodvinsk had low risk of water-born infections (5 points). Proportions of samples with abnormal concentrations of general and thermotolerant coliform bacteria in Arkhangelsk, Kotlas, Novodvinsk after water treatment varied between 16 % and 27 % while in Korazhma the corresponding proportions varied between 21 % and 53 % Irregular water supply have contributed with 18 % and 14 % in Arkhangelsk and Kotlas, respectively. Conclusions: The presence of general and thermotolerant coliform bacteria in drinking water detected immediately after water treatment and in water supply network are the main contributors to the epidemic risk of water-born infections in towns of the Arkhangelsk region. Irregularity of water supply was additional factor linked to microbial contamination in Arkhangelsk and Kotlas. |
