The shareholders of COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO - SABESP ('Company') are hereby called, in accordance with Article 5, paragraph 1, of the Company's Bylaws, to an Extraordinary Shareholders' Meeting to be held on November 10, 2015, at 11:00 a.m., at the Company's headquarters, located at Rua Costa Carvalho nº 300, in the city and state of São Paulo, to resolve on the following matters:

(i) Election of an alternate member of the Fiscal Council, with term of office running through 2016;
(ii) Resolution on the terms and conditions of the Protocol and Justification of the Merger of EMPRESA DE ÁGUA E ESGOTO DE DIADEMA S.A. ('EAED'), the Company's wholly-owned subsidiary;
(iii) Ratification of the appointment and contract of Priori Serviços e Soluções Contabilidade EIRELI-ME, company responsible for preparing the Report of Appraisal on the assets of EAED ('Report of Appraisal');
(iv) Approval of the Report of Appraisal; and
(v) Resolution on the merger of EAED into the Company.
Proof of the status of shareholder may be provided at any time before the opening of the meeting by presentation of identification, proof of ownership and the number of shares held issued by the depositary financial institution and, in the case of proxy representation, the applicable proxy appointment duly notarized and granted within the last twelve
months.

The documents related to the matters to be discussed in the Extraordinary Shareholders' Meeting will be at the shareholders' disposal at the Company's headquarters and
electronically, on the CVM's website, on the internet, pursuant to CVM Instruction 481/2009.

São Paulo, October 9, 2015.

Benedito Pinto Ferreira Braga Júnior
Chairman of the Board of Directors

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