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The development of mining industry sector causes some negative impacts on the environment. One of them is water pollution in the area surrounding the mining location. To reduce the impact, monitoring and management of water waste quality is one of the important things to do, to ensure the quality of tailing from flotation reach the tailings quality standard and has no impact on sea water. In this research analyzed the quality standard of tailings from flotation and quality standard of sea water in PT Amman Mineral Nusa Tenggara. The tailings quality standard analyze referring to Environment Minister Decision No. 92 in 2011. While the quality standard of sea water quality referring to Environment Minister Decision No. 382 in 2016. The parameter of tailings quality including pH, Solid Fraction, Density and Concentration of dissolved metal. Based on the results of the monitoring and management analysis, tailing from flotation that streamed to Teluk Senunu fill the quality standard of tailings . The results of sea water quality in Teluk Senunu filled the quality standard of sea water . Deep Sea Tailing Placement does not have negative impact, because the plankton ecosystem has increased in Teluk Senunu from beginning 1997 to 2016.