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Cover
 12 Months Ended
Dec. 31, 2024
shares
Entity Addresses [Line Items]  
Document Type 20-F
Amendment Flag false
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Period End Date Dec. 31, 2024
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2024
Current Fiscal Year End Date --12-31
Entity File Number 001-31317
Entity Registrant Name COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP
Entity Central Index Key 0001170858
Entity Incorporation, State or Country Code D5
Entity Address, Address Line One Rua Costa Carvalho, 300
Entity Address, City or Town São Paulo
Entity Address, Country BR
Entity Address, Postal Zip Code 05429-900
Title of 12(b) Security American Depositary Shares
Trading Symbol SBS
Security Exchange Name NYSE
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Common Stock, Shares Outstanding 683,509,868
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Auditor Firm ID 5485
Auditor Name BDO RCS Auditores Independentes SS Ltda.
Auditor Location São Paulo-SP, Brazil
Business Contact [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One Rua Costa Carvalho, 300
Entity Address, City or Town São Paulo
Entity Address, Country BR
Entity Address, Postal Zip Code 05429-900
City Area Code 55 11
Local Phone Number 3388 8000
Contact Personnel Name Daniel Szlak
Contact Personnel Email Address dri@sabesp.com.br