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As the demand for water increases, water reuse has become an increasingly important source of water in many parts of the world, particularly in arid and semi-arid regions. In this paper, categories of water reuse are identified, and planning methodologies and economics for wastewater reclamation and reuse are discussed, emphasizing implementation. Special attention is paid to tertiary treatment systems which produce essentially pathogen-free effluent for variety of uses including irrigation of parks, school yards, and golf courses as well as groundwater recharge in the urban environment.