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. 2011 Apr;42(2):560-6.
doi: 10.1590/S1517-838220110002000021. Epub 2011 Jun 1.

Quality of water sources used as drinking water in a Brazilian peri-urban area

Maria Tereza Pepe Razzolini  1 , Wanda Maria Risso Günther, Francisca Alzira Dos Santos Peternella, Solange Martone-Rocha, Veridiana Karmann Bastos, Thaís Filomena da Silva Santos, Maria Regina Alves Cardoso
Affiliations

Quality of water sources used as drinking water in a Brazilian peri-urban area

Maria Tereza Pepe Razzolini et al. Braz J Microbiol. 2011 Apr.

Abstract

The objective of this paper was to assess bacteriological quality of drinking water in a peri-urban area located in the Metropolitan Region of São Paulo, Brazil. A total of 89 water samples were collected from community plastic tanks and 177 water samples from wells were collected bimonthly, from September 2007 to November 2008, for evaluating bacteriological parameters including: Escherichia coli, Enterococcus and heterotrophic plate count (HPC). Clostridium perfringens was investigated in a subsample (40 samples from community plastic tank and 40 from wells). E. coli was present in 5 (5.6%) samples from community plastic tanks (2.0 - 5.1x10(4) MPN/100mL) and in 70 (39.5%) well samples (2.0 - 8.6x10(4) MPN/100mL). Thus, these samples were not in accordance with the Brazilian Regulation. Enterococcus was detected in 20 (22.5%) samples of the community plastic tanks (1 to 79 NC/100mL) and in 142 (80.2%) well samples (1 to >200 NC/100mL). C. perfringens was detected in 5 (12.5%) community plastic tanks samples and in 35 (87.5%) wells samples (2.2 to >16 MPN/100mL). HPC were above 500 CFU/mL in 5 (5.6%) waters from community plastic tanks. In wells samples, the HPC ranged from <1 to 1.6x10(4) CFU/mL. The residual chlorine did not attend the standard established in the drinking water legislation (0.2 mg/L), except in 20 (22.5%) samples. These results confirm the vulnerability of the water supply systems in this peri-urban area what is clearly a public health concern.

Keywords: Clostridium perfringens; Enterococcus; Escherichia coli; drinking water; peri-urban area.

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Figures

Figure 1
Figure 1
E. coli concentration in wells samples with precipitation index (mm), by month, Suzano, São Paulo, September 2007 -November 2008.
See this image and copyright information in PMC

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