v3.26.1
Related-party balances and transactions (Tables)
12 Months Ended
Dec. 31, 2025
Notes and other explanatory information [abstract]  
Schedule of loan agreement through credit facility
     
  December 31, 2025   December 31, 2024
       
Current      
Accounts receivable:      
Sanitation services 163,865   173,466
Allowance for losses (42,753)   (51,706)
       
Reimbursement of additional retirement and pension benefits paid (G0):      
Monthly flow 32,141   84,973
GESP Agreement – 2015 123,135   112,813
       
Total current 276,388   319,546
       
Noncurrent      
Agreement for the installment payment of sanitation services 1,361   1,361
       
Reimbursement of additional retirement and pension benefits paid (G0):      
GESP Agreement – 2015 861,421   907,514
       
Total non-current 862,782   908,875
       
Total receivable 1,139,170   1,228,421
       
Assets:      
Sanitation services 122,473   123,121
Reimbursement of additional retirement and pension benefits paid (G0) 1,016,697   1,105,300
       
Total 1,139,170   1,228,421
       
Liabilities:      
Dividends and interest on capital payable 428,681   458,985
Schedule of loan agreement through credits facility
     
  2025   2024
       
Revenue from sanitation services 952,803   891,312
Payments received from related parties (910,676)   (843,026)
       
Reimbursement received referring to Law No. 4,819/1958 (276,307)   (178,941)
Schedule of expenses related to the compensation
Schedule of expenses related to the compensation        
 Compensation   2025 2024 2023
Short-term benefits to employees and key management personnel   39,828 9,811 9,230
Share-based payments  

22,618

-

-

Total compensation   62,446 9,811 9,230