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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.

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