Notice To The Market

SÃO PAULO, May 15, 2017 /PRNewswire/ -- Companhia de Saneamento Básico do Estado de São Paulo - SABESP (BM&FBovespa: SBSP3; NYSE: SBS), one of the largest water and sewage service provider in the world based on the number of customers, hereby announces that on May 15, 2017, filed its annual report on Form 20F for the fiscal year ended December 31, 2016 (the "2016 Annual Report") with the Securities and Exchange Commission (the "SEC"). The 2016 Annual Report can be accessed by visiting either the SEC's website at www.sec.gov or the Company's website.

In addition, shareholders may receive a hard copy of the Company's 2016 Annual Report, free of charge, by requesting a copy within a reasonable period of time from Investor Relations area located at Rua Costa Carvalho, 300 - 05429-900 - São Paulo - Brasil or email: abairoldi@sabesp.com.br.

IR Contacts:
Mario Arruda Sampaio – +55 (11) 3388-8664 (maasampaio@sabesp.com.br)
Angela Beatriz Airoldi – +55 (11) 3388-8793 (abairoldi@sabesp.com.br)

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SOURCE Companhia de Saneamento Basico do Estado de Sao Paulo - SABESP