Companhia de Saneamento Basico do Estado de Sao Paulo - SABESP (SABESP) is a Brazil-based company which provides basic and environmental sanitation services. The Company is engaged in the supply and treatment of water and collection, transportation, treatment and disposal of sewage. As of December 31, 2011, the Company provided water and sewage services in 363 municipalities in the Brazilian state of Sao Paulo. The Company's majority shareholder is the government of the state of Sao Paulo. As of December 31, 2011, SABESP held shares in a number of companies, including Sesamm - Servicos de Saneamento de Mogi Mirim SA, Aguas de Andradina SA, Saneaqua Mairinque SA, Aquapolo Ambiental SA, Attend Ambiental SA and Aguas de Castilho SA.