In this work, current information about the contamination of groundwater by arsenic (As) from geogenic sources in Chihuahua state, Mexico is presented together with a possible emerging mitigation solution. The problem in Chihuahua is of the same order of magnitude as other world regions, such as Argentina. Despite the studies undertaken by numerous local researchers, and the identification of proven treatment methods for the specific water conditions encountered, no technologies have been commercialized to treat reject water from the Reverse Osmosis System (ROS). The use of constructed wetlands like an emerging, low-cost technologies to mitigate the problem of As in reject water from ROS that are installed for rural and urban areas have been evaluated. This technology generally use simple and low-cost equipment that can easily be handled and maintained by the local population and the water obtained can be used to irrigation of some crops, resulting in a benefit to community.