SABESP Announces Material Fact

                        SABESP Announces Material Fact

PR Newswire

SAO PAULO, April 19, 2013

SAO PAULO, April 19, 2013 /PRNewswire/ --Companhia de Saneamento Basico do
Estado de Sao Paulo - SABESP (BM&FBovespa: SBSP3; NYSE: SBS), one of the
largest water and sewage service providers in the world based on the number of
customers, pursuant to Instruction 358 issued by the Brazilian Securities and
Exchange Commission (CVM) on January 3, 2002, as amended, hereby informs its
shareholders and the market in general that the Company's Board of Directors
approved on this date a tariff adjustment of 2.3509%, in compliance with
ARSESP Resolution 406 and Article 28 of the Tariff System Regulation approved
by State Decree no. 41446, dated December 16, 1996.

The Company also announces the following:

      The Regulation and Supervision Rate of 0.5% approved by Resolution 406
      will be applied immediately after the conclusion of the operational
a) adjustments necessary for the inclusion of this rate in the bills in the
      municipalities where it will be charged.

      On April 4, 2013, filed a Request for Reconsideration at ARSESP, related
b)  to the terms of Resolution 406, with the objective of protecting the
      Company's interests within the ongoing Tariff Review process.

      The full version of the Request for Reconsideration is available in the
      Investor Relations section of Sabesp's website.

      On this date, ARSESP informed the Company that its Executive Board
      approved Resolution 413, which envisages the cancellation of the
      validity of Resolution 407, postponing authorization for the
c)  pass-through to the service bill of the municipal charges provided for
      by law that must be included in the Tariff Review upon disclosure of the
      final result of Sabesp's Tariff Review, in compliance with the Program
      Agreements and the Agreements for the Provision of Water Supply and
      Sewage Services.

The full version of ARSESP Resolution 413 is available in the Investor
Relations section of Sabesp's website.

IR Contacts:

Mario Arruda Sampaio: (55 11) 3388-8664 (
Angela Beatriz Airoldi: (55 11) 3388-8793 (

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