The aim of this work was to evaluate the groundwater quality in the surrounding area of Visconde do Rio Branco landfill in Minas Gerais State. Between September 2010 to October 2011 the parameters pH, temperature, dissolved oxygen, electrical conductivity, E. coli, total coliforms, Al, Cd, Cu, Pb, Cr, Fe, Mn, Hg, and Zn were monitored in the leachate and in the wells, and besides those mentioned, biological oxygen demand and chemical oxygen demand were monitored in the streams present in the area of study. High levels of Mn, Fe, Al, Hg and microbiologic contamination were observed, which were more evident during rainy periods. Possible unconformities origins may be problems with leachate drainage, in ponds and landfill sealing system and in the coverage of the cells. There should be more control in the sealing and closure of the cells, as with the construction and maintenance of the drainage system ensuring all the leachate produced is sent to the treatment ponds.
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