Abstract
ABSTRACT Water, fundamental to the existence of mankind, demands the attention of competent authorities since its contamination could become a vehicle for transmission of infectious diseases. Thus the present work aimed to investigate the presence of fecal and total coliforms in water samples taken from wells, a lake and both the margin and channel of the Tiete River, Barra Bonita Dam, Botucatu, São Paulo, Brazil. The necessity of investigation arose by virtue of a high gastrenteritis index detected in the population that utilizes these hydric resources. The most probable number (MPN) of fecal and total coliforms was determined for 168 water samples through the method of multiple tubes. The results showed that only 42% of the samples collected in 4 wells investigated were considered of good quality for human consumption, by not presenting fecal coliforms in 100 mL of water, according to Decree Nº 518 de 25/103/2004. Regarding suitability for bathing/recreational use, according to CONAMA Resolution 357 of 17/03/2005, it was observed that in the locations investigated, only 10% of the samples analyzed were considered inappropriate for bathing and 90% of the remainder were considered satisfactory.
Highlights
The preservation of water quality is a universal necessity that demands attention on the part of sanitation authorities and agencies, with regard to water sources and water for human consumption, inasmuch as their contamination by human and animal excrement can become a vehicle for transmission of infectious and parasitic diseases
The present work aimed to investigate the presence of fecal and total coliforms in water samples taken from wells, a lake and both the margin and channel of the Tiete River, Barra Bonita Dam, Botucatu, São Paulo, Brazil
The most probable number (MPN) of fecal and total coliforms was determined for 168 water samples through the method of multiple tubes
Summary
The preservation of water quality is a universal necessity that demands attention on the part of sanitation authorities and agencies, with regard to water sources and water for human consumption, inasmuch as their contamination by human and animal excrement can become a vehicle for transmission of infectious and parasitic diseases. According to the World Health Organization, 80% of diseases that occur in the developing world are. Caused by contamination of water (VALENTE et al, 1999). Diseases related to water are classified as those of hydric transmission (which act as a vehicle for an infectious agent), and those of hydric origin, caused by determined organic or inorganic chemical substances, present in water at inadequate concentrations, generally higher than standard specifications for water for human consumption (FOOD AND DRUG ADMINIDTRATION, 1998)
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