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The Pima County Regional Wastewater Reclamation Department (PCRWRD), in Tucson, Arizona was funded by the U.S. Environmental Protection Agency (EPA) to conduct the Arid West Water Quality Research Project (AWWQRP). The objective of the project was to improve the scientific base for regulation of water quality, protection of species, habitats, and uses of watercourses, and designation of appropriate treated wastewater effluent controls in ephemeral and effluent-dependent watercourses of the arid and semi-arid western states.