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Gold processing activities along the Ciherang river use mercury. Monitoring and managing the impact of gold processing activities on the environment in accordance with the standard quality of wastewater quality of the Ministry of Environment No.202 Th.2004 concerning Wastewater Quality Standards for Gold and or Copper Ore Processing Activities. Monitoring the quality of waste water flowing into the river by observing water pH, TDS and mercury content. Environmental management is carried out by reducing the mercury metal content in wastewater, with the phytoremediation method using Eichhornia Crassipes. Monitoring is carried out at 5 different locations, wastewater out of gold processing, 2 locations at the settling pond and 2 locations at the river water. The results showed an increase in mercury content in settling pond 2, 0.525 mg / L and settling pond 3, 0.00903 mg / L. Environmental management with the Fitoremediation method day 0 Hg levels of 0.06284 mg / L, day 4 Hg levels produced to 0.01203 mg / L, day 8 the value of Hg levels 0.114 mg / L, the 12th day the value of the The resulting Hg 0.01267 mg / L