Abstract

In the Nowy Sącz district (Southern Poland) the water supply network is not sufficiently developed and many farms use individual dug or deep wells. Groundwater supplying dug wells comes from atmospheric precipitation and may be contaminated with agricultural fertilizers, municipal and industrial sewage. Groundwater present in deep wells is well protected against pollution and low water temperature limits the multiplication of microorganisms. Microbiological tests of water are aimed at determining the total number of microorganisms in 1 ml of the tested sample and checking the presence of indicator bacteria, i.e. coliform bacteria and Escherichia coli in the water. The aim of this work was to perform a microbiological analysis of 100 selected samples of water intended for drinking purposes from individual dug or deep wells located in the Nowy Sącz district. In the tested water samples from individual intakes an increase in the total number of microorganisms, the presence of coliform bacteria and Escherichia coli bacteria were noted. Water from dug wells, that do not have proper insulation, is characterized by significant bacteriological contamination compared to water from deep wells. In the most cases water from deep wells meets the required microbiological standards.

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