    <SEC-DOCUMENT>0001292814-21-001670-index.html : 20210422
    <SEC-HEADER>0001292814-21-001670.hdr.sgml : 20210422
    <ACCEPTANCE-DATETIME>20210422071206
    ACCESSION NUMBER:		0001292814-21-001670
    CONFORMED SUBMISSION TYPE:	6-K
    PUBLIC DOCUMENT COUNT:		7
    CONFORMED PERIOD OF REPORT:	20201231
    FILED AS OF DATE:		20210422
    DATE AS OF CHANGE:		20210422

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP
    		CENTRAL INDEX KEY:			0001170858
    		STANDARD INDUSTRIAL CLASSIFICATION:	WATER SUPPLY [4941]
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			D5
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		6-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-31317
    		FILM NUMBER:		21843251

    	BUSINESS ADDRESS:
    		STREET 1:		RUA COSTA CARVALHO, 300
    		STREET 2:		SAO PAULO
    		CITY:			SP
    		STATE:			D5
    		ZIP:			05429-900
    		BUSINESS PHONE:		011-55-11-3388-8000

    	MAIL ADDRESS:
    		STREET 1:		RUA COSTA CARVALHO, 300
    		STREET 2:		SAO PAULO
    		CITY:			SP
    		STATE:			D5
    		ZIP:			05429-900
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>6-K
    <SEQUENCE>1
    <FILENAME>sbsdf2020_6k.htm
    <DESCRIPTION>6-K
    <TEXT>
    Document 1 - file: sbsdf2020_6k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>sbsdf2020_001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: sbsdf2020_001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>sbsdf2020_002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: sbsdf2020_002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>sbsdf2020_003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: sbsdf2020_003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>sbsdf2020_004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: sbsdf2020_004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>sbsdf2020_005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: sbsdf2020_005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>sbsdf2020_006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: sbsdf2020_006.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>