The study "Wastewater purification, using aquatic species, in Moyobambacity", aro se that in our region there are no experiences that have documented the use and exploitation of macrophytes on treatments for residential and industrial effluents. The objective of this research was to evaluate the efficiency of the Eichhornia crassipes and Pistia stratiotes species in removing pollutants present in the wastewater. T o achieve that goal will design a sewage treatment system with a hydraulic retention time of 8 days, where they were introduced the species mentioned in different times and separately; this research added a third treatment consisting of a partnership between the two species. The results obtained showed that Eichhornia crassipes ts more efficient in wastewatertreatment, achieving high removals in: 85.5 % in total coliforms, 77.7 Nitrates, 73.5 thermotolerant coliforms, DBOs,2o 6...