Report of Foreign Issuer (6-k)

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16 OF THE

SECURITIES EXCHANGE ACT OF 1934

For August, 2017

(Commission File No. 1-31317)

Companhia de Saneamento Básico do Estado de São Paulo - SABESP

(Exact name of registrant as specified in its charter)

Basic Sanitation Company of the State of Sao Paulo - SABESP

(Translation of Registrant's name into English)

Rua Costa Carvalho, 300
São Paulo, S.P., 05429-900
Federative Republic of Brazil

(Address of Registrant's principal executive offices)

Indicate by check mark whether the registrant files or will file
annual reports under cover Form 20-F or Form 40-F.

Form 20-F ___X___ Form 40-F ______

Indicate by check mark if the registrant is submitting the Form 6-K
in paper as permitted by Regulation S-T Rule 101(b)(1)__.

Indicate by check mark if the registrant is submitting the Form 6-K
in paper as permitted by Regulation S-T Rule 101(b)(7)__.

Indicate by check mark whether the registrant by furnishing the
information contained in this Form is also thereby furnishing the
information to the Commission pursuant to Rule 12g3-2(b) under
the Securities Exchange Act of 1934.

Yes ______ No ___X___

If "Yes" is marked, indicated below the file number assigned to the
registrant in connection with Rule 12g3-2(b):

SABESP90_10

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP

PUBLICLY-HELD COMPANY

Corporate Taxpayer’s ID (CNPJ) No. 43.776.517/0001-80

NOTICE TO THE MARKET

Companhia de Saneamento Básico do Estado de São Paulo – Sabesp, hereby announces to its shareholders and to the market in general that the São Paulo State Sanitation and Energy Regulatory Agency (ARSESP – Agência Reguladora de Saneamento e Energia do Estado de São Paulo) has scheduled the Public Hearing No. 02/2017 for August 31, 2017.

The goal of this hearing is to discuss the Maximum Preliminary Average Tariff (Preliminary Tariff P0) and Weighted Average Cost of Capital (WACC), under SABESP's 2 ^nd Ordinary Tariff Revision (OTR).

The documents concerning this Public Hearing – the rules with the procedures to attend the hearing, the application form for oral presentation, as well as the Technical Note NT/F/003/2017, which was an object of Material Fact disclosed by the Company on August, 11 ^th , 2017 – are available to stakeholders at the following addresses:

Internet: http://www.arsesp.sp.gov.br/SitePages/audiencias-publicas.aspx

ARSESP's Headquarters: Avenida Paulista, 2313, 4th floor, CEP 01311-300 - São Paulo-SP

The Technical Note is also available on Sabesp’s Investor Relations website.

Time and location’s details:

Date: August 31, 2017

Time: from 2:30 p.m. to 5:30 p.m. (GMT -3)

Venue: Auditório Espaço de Cidadania (Auditorium Citizen Space) “André Franco Montoro”, located at Patio do Colégio, 148 - Centro - São Paulo - SP - Ground floor (headquarters of the Secretariat of Justice and Defense of Citizenship)

São Paulo, August 18, 2017.

Rui de Britto Álvares Affonso

Chief Financial Officer and Investor Relations Officer

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, in the city São Paulo, Brazil.

Date: August 18, 2017

Companhia de Saneamento Básico do Estado de São Paulo - SABESP

By:	/s/ Rui de Britto Álvares Affonso
	Name: Rui de Britto Álvares Affonso Title: Chief Financial Officer and Investor Relations Officer

FORWARD-LOOKING STATEMENTS

This press release may contain forward-looking statements. These statements are statements that are not historical facts, and are based on management's current view and estimates of future economic circumstances, industry conditions, company performance and financial results. The words "anticipates", "believes", "estimates", "expects", "plans" and similar expressions, as they relate to the company, are intended to identify forward-looking statements. Statements regarding the declaration or payment of dividends, the implementation of principal operating and financing strategies and capital expenditure plans, the direction of future operations and the factors or trends affecting financial condition, liquidity or results of operations are examples of forward-looking statements. Such statements reflect the current views of management and are subject to a number of risks and uncertainties. There is no guarantee that the expected events, trends or results will actually occur. The statements are based on many assumptions and factors, including general economic and market conditions, industry conditions, and operating factors. Any changes in such assumptions or factors could cause actual results to differ materially from current expectations.

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