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26. Operating revenue (Tables)
 12 Months Ended
Dec. 31, 2017
Operating Revenue Tables  
Operating revenue
  2017 2016 2015
       
Metropolitan region of São Paulo 8,636,926 7,749,694 6,021,949
Regional Systems 3,586,820 3,372,538 2,924,876
Total 12,223,746 11,122,232 8,946,825
Reconciliation between gross operating income and net operating income
  2017 2016 2015
       
Revenue from sanitation services (i) 12,223,746 11,122,232 8,946,825
Construction revenue 3,150,877 3,732,877 3,336,716
Sales tax (757,619) (756,901) (571,972)
Regulation, Control and Oversight Fee (TRCF) (8,771) - -
Net revenue 14,608,233 14,098,208 11,711,569

 

(i) Includes the amount of R$ 8,771 corresponding to the TRCF charged from customers from the municipalities regulated by ARSESP.