Abstract
This study aimed at evaluating the physical-chemical quality of public water supply in the region of the Vale do Ribeira, SP, Brazil, from 2008 to 2010. The parameters analyzed were iron, turbidity, nitrate and apparent color that were evaluated according to the Decree n. 2914/2011 of the Brazilian Ministry of Health. The measured fluoride was evaluated according to the Regulation of the State Secretariat of Health of Sao Paulo SP 250/1995. A total of 1,254 water samples were collected from 15 municipalities of this region. The results showed that 46 % of samples were inadequate for consumption mainly because of the fluoride contents, which is added into public water supplies to prevent tooth decay. This study showed that 42.7 % of samples were incompliant with the recommended range (0.6 to 0.8 mg.L-1). Turbidity, iron and apparent color above the maximum recommended values (MRV) were identified in 2.2 %, 6.1 % and 2.1 % of samples, respectively. No nitrate was detected in the analyzed samples. Based on these finding, it is needed to implement a program for monitoring public water supply in this region.
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