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28 Operating revenue (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Revenue |  |  |  |
Revenue from sanitation services | [1] | R$ 15,157,780 | R$ 16,134,032 | R$ 14,253,609
Construction revenue |  | 3,716,616 | 2,946,566 | 2,802,670
Sales tax |  | (1,009,358) | (1,035,051) | (916,808)
Regulation, Control and Oversight Fee (TRCF) |  | (67,497) | (61,893) | (54,377)
Net operating revenue |  | R$ 17,797,541 | R$ 17,983,654 | R$ 16,085,094
[1] | Includes the amount of R$ 72,962 corresponding to the TRCF charged from customers from the municipalities regulated by ARSESP (R$ 70,122 in 2019).

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