This Executive Summary is one output from and Environmental Protection Agency Environmental Technology Initiative (ETI) Program funded and undertaken in cooperation with the city of Phoenix and the U.S. Bureau of Reclamation. This project developed information and guidance to facilitate treatment wetland projects that provide multiple environmental benefits. The potential benefits of treatment wetlands include improved water quality, creation of wildlife habitat, and enhancement of the public's understanding and appreciation of constructed wetlands. Other efforts under the ETI project dealt with the ability of treatment wetlands to improve water quality and with policy and permitting considerations facing the technology. This Executive Summary and the companion report, Treatment Wetland Habitat and Wildlife Use Assessment, summarize what is known about these systems in terms of their ecological structure and function and how they are used by the public. This portion of the effort is termed the ETI Treatment Wetland Habitat and Wildlife Use Assessment (ETI Wetland Habitat Project).