Companhia de Saneamento Básico do Estado de São Paulo : Notice to the market

Companhia de Saneamento de Companhia de Saneamento Básico do Estado de São Paulo - Sabesp ('Company' or 'Sabesp') hereby informs its shareholders and the market in general that, pursuant to the provisions of article 30, item XXX of CVM Instruction No 480/09, the Board of Directors appointed Mr. Ernesto Rubens Gelbcke as Coordinator and Financial Expert of the Audit Committee, replacing Mr. Jerônimo Antunes.

Mr. Jerônimo Antunes will remain a member of the Board of Directors. His tenure will end on April 2020.

Curriculum Vitae

Ernesto Rubens Gelbcke

Mr. Gelbcke has been an independent member of our board of directors since April 2018. Mr. Gelbcke has a Bachelor's degree and a Master's degree in accounting sciences, both from the School of Economics, Administration and Accounting of the University of São Paulo (Faculdade de Economia, Administração e Contabilidade da Universidade de São Paulo - FEA USP). He worked at Arthur Andersen (various positions, including São Paulo audit coordinator and member of the Brazil technical policies committee) from 1965 to 1976, Directa Auditores (founder and CEO) from 1977 to 2014, Grant Thornton Brasil (chairman of the board of directors) from 2014 to 2015, Gelbcke Consultores (founder and consultant) since 2001, and GHG Contadores (founder) since 2017. He was one of the twelve elected members of the Accounting Pronouncements Committee, representing the Foundation Institute of Accounting, Actuary and Financial Research (Fundação Instituto de Pesquisas Contábeis, Atuariais e Financeiras - FIPECAFI) from its creation in 2006 until 2016. He was also a professor at FEA USP from 1971 to 2003, professor and coordinator of the audit specialization course at the Central Bank with the Foundation Institute for Accounting, Actuarial and Financial Research (Fundação Instituto de Pesquisas Contábeis, Atuariais e Financeiras - FIPECAFI) from 1978 to 1980, among others. He has authored and co-authored various articles, technical opinions and books, such as 'Accounting Manual for Stock Companies' (Manual de Contabilidade das Sociedades por Ações), 'Manual for Corporate Accounting' (Manual de Contabilidade Societária), and 'Intermediate Accounting' (Contabilidade Intermediária). He was a member of the fiscal committee and of the audit committee of AMBEV S.A. from 2007 to 2009, a member of the Board of Directors of the Brazilian Institute of Independent Accountants (Instituto dos Auditores Independentes do Brasil - IBRACON) from 2015 to 2017, and a member of the audit committee of AES Eletropaulo in 2017, among others. Since 2017, he has been a member of the fiscal council of FIPECAFI. This ter m expires in 2019.