This slide presentation presents information on the partnership between Aguas Andinas and the Chilean Water and Sanitation Sector, a public/private partnership. Topics covered include: market concentration and state's participation; comparison of Latin American water and sewerage coverages by country; international tariff comparison; Aguas Andinas' profitability from 1994 to 2001; basic principles of the water and sanitation sector restructuring; basic principle of the tariff framework; incorporation of private operators to the state's companies; main objectives of the Aguas Andinas public/private partnership; characteristics of the private's incorporation to Aguas Andinas' partnership; wastewater treatment development plan; and, main management best practices introduced in Aguas Andinas.