Incidence of total coliforms and Escherichia coli in water samples for human consumption in the city of Florestópolis – PR: comparison between rural and urban areas

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Waterborne disease has currently been related mainly to water contamination by the Coliform group, which is divided between total coliforms and Escherichia coli, being E. coli an important subgroup, as it belongs to the intestinal tract of warm-blooded animals. As this is a relevant association, in the case of some E. coli pathogens, it has a pathogenic potential, especially in humans. In the case of water for human consuption, according to current legislation in Brazil, Ordinance GM/MS nº888 of May 4, 2021, recommends the absence of total coliforms and E. coli in 100 mL of water per sample analyzed. It is due to the importance of these factors that each municipality must carry out periodic analyzes to maintain the quality of water distribution to the population. In places where there is no distribution of treated water, such as in rural areas, it is common to use alternative solutions to capture groundwater. A total of 205 water samples from the municipality of Florestópolis-PR were analyzed. For the evaluation of total coliforms and E. coli, the chromogen substrate Colilert® was used.A total of 170 (82.92%) samples presented satisfactory to bacteriological standards, however 35 (17.07%) samples presented at least one of the altered parameters. Interconnected to these contamination factors are criteria established in the legislation which recommends the use of free residual chlorine for maintenance disinfection in distribution systems, among the analyzed samples 36 (17.56%) presented values beyond the stipulated being the minimum 0 .2 mL/L to 2.0 mL/L due to its high reactivity with organic and inorganic substances. It was noticed that these values above the forecast converged the rainfall index in these periods, which contributes to a higher concentration of organic particles, which requires higher concentrations of chlorine for water treatment. In short, although rural areas are associated with higher levels of contamination due to the lack of treatment or maintenance of alternative solutions, there was in this case the occurrence of lower levels of contamination in these places. It is concluded that the population that receives water through distribution systems must perform preventive maintenance on their easels or hydrometers, such as cleaning it, but on the other hand, the use of household filters for the treatment of drinking water is recommended, with a view to good health.

  • 1 Departamento de Microbiologia / Centro de Ciências Biológicas / Universidade Estadual de Londrina
  • 2 Universidade Estadual de Londrina
  • 3 Centro de Ciências Biológicas / Universidade Estadual de Londrina
  • 4 UNIFIL / Centro Universitário Filadélfia
  • Environmental Microbiology
Water quality
Escherichia coli