Analysis of the environmental impacts caused to the water of Miriti lake in the municipality of Manacapuru-Am.

Despite the great supply of water resources, the Amazon Hydrographic Region shows signs of environmental degradation when it comes to water quality, especially in areas located near major urban centers. The purpose of this work was to go to the field to collect water samples from the Miriti-AM lake, to evaluate the physico-chemical and microbiological parameters of the same, being selected for evaluation: pH, turbidity, temperature, BOD5, OD and thermotolerant coliforms. The parameters of Water Quality (QA) analyzed were compared with the limits established by CONAMA Resolution 357/2005. At all points the presence of thermotolerant coliforms was not found but, it was found the presence of gram-negative bacteria which indicates total coliforms. With the project carried out in Lake Miriti-AM, it was verified that the water condition of this spring is not fully within the quality standards established by the legal norms for use of class I waters, requiring intervention measures for the protection of this source for control and adaptation of standards that are in disagreement with legal norms