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28. Operating revenue (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Revenue Details 1Abstract      
Sanitation services [1] R$ 14,253,609 R$ 12,223,746 R$ 11,122,232
Construction revenue 2,802,670 3,150,877 3,732,877
Sales Tax (916,808) (757,619) (756,901)
Regulation, Control and Oversight Fee (TRCF) (ii) (54,377) (8,771) 0
Net operating revenue R$ 16,085,094 R$ 14,608,233 R$ 14,098,208
[1] Includes the amount of R$63,901 corresponding to the TRCF charged from customers from the municipalities regulated by ARSESP.