Where does all the water go? according to the environmental protection agency (epa), in a typical wetland environment, of the water is outflow; is seepage; evaporates; and remains as water volume in the ecosystem (reference: u. s. environmental protection agency case studies report 832-r-93-005). chloride compounds as residuals from residential areas are a problem for wetlands. suppose that in a particular wetland environment the following concentrations (mg/l) of chloride compounds were found: outflow, ; seepage, ; remaining due to evaporation, ; in the water volume, .