SABESP: NOTICE TO THE MARKET

SÃO PAULO, May 2, 2018 /PRNewswire/ -- Companhia de Saneamento Básico do Estado de São Paulo - SABESP (B3: SBSP3; NYSE: SBS), one of the largest water and sewage service providers in the world based on the number of customers, hereby announces that on April 26, 2018, filed its annual report on Form 20F for the fiscal year ended December 31, 2017 (the "2017 Annual Report") with the Securities and Exchange Commission (the "SEC"). The 2017 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 2017 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 at +55 (11) 3388-8793 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 SABESP