ABSTRACT
The occurrence of cyanobacteria and cyanotoxins in reservoirs in São Paulo State is a challenge to the production of drinking water. Seven reservoirs used for public supply and monitored by CETESB, were analyzed regarding cyanobacteria, microcystin and indicators of fecal contamination between 2011-2015. The percentages of non-compliance with water quality standards were calculated. Results highlighted the presence of cyanobacteria and microcystin (maximum of 22.4 µg/L), as well as conflicts with the standards provided by CONAMA Resolution No. 357/2005 (BRASIL, 2005BRASIL. (2005) Resolução CONAMA nº 357, 17 de março de 2005. Dispõe sobre a classificação dos corpos de água e diretrizes ambientais para o seu enquadramento, bem como estabelece as condições e padrões de lançamento de efluentes, e dá outras providências. Diário Oficial [da] República Federativa do Brasil, Brasília.), which reinforces the importance of investments in sanitary sewage collection and treatment. The need for greater integration between laws and resolutions on issues related to water quality were also discussed, as well as better planning of water resources, focusing on progressive goals for water quality improvement.
Keywords:
reservoirs; sanitary sewage; cyanotoxins; public supply; São Paulo State
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