Changes in agricultural practices, and irrigation strategies combined with natural processes, have led to increased salinization of soil and water resources worldwide. Coal bed methane (CBM) development in the Powder River Basin of Montana and Wyoming results in the co-production of large volumes of modestly saline-sodic discharge water, and represents a potential source of salinization in areas of CBM development. The objective of this study was to evaluate the potential of constructed wetlands as a tool for CBM product water management. This was accomplished by assessing seasonal water use and water use efficiency (WUE) of three plant communities. Native species establish hydrologically distinct communities in former ephemeral channels now running with CBM product water, and nine species of those cataloged were selected and segregated into three communities. Closed-system wetland cells were constructed and each community was assigned to four of these cells, i.e., lysimeters. Chemistry of the supply water was a relatively low electrical conductivity (EC) and high sodium adsorption ratio (SAR) water (EC~ 3dS/m, SAR >25), typical of northern portions of the Powder River Basin. All three communities had similar seasonal water use but WUE's differed significantly among the communities. This is likely due to overall differences in biomass production, as WUE is a relative value indicating consumptive water use as a function of biomass production. Evaporation from a Class A evaporation pan was observed to be significantly higher than evapotranspiration from the planted lysimeters. This suggests an open water surface has the potential to evaporate more CBM product water than a constructed wetland. Species survivability was very good, with exception of American bulrush (Scirpus americanus) and Inland saltgrass (Distichlis stricta). It was evident American bulrush did not survive the winter while Inland saltgrass was likely out-competed by Creeping spikerush (EZeocharis paZustris). Results indicate that constructed wetlands planted with native, salt tolerant species have the potential to utilize substantial volumes of CBM product water while remaining viable and robust.