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Operating revenue (Details 1) - BRL (R$) R$ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Revenue
Revenue from sanitation services	[1]	R$ 18,629,959	R$ 16,304,206	R$ 15,157,780
Construction revenue		4,863,752	4,376,739	3,716,616
Sales tax		(1,363,628)	(1,121,905)	(1,009,358)
Regulatory, Control and Oversight Fee (TRCF)		(74,363)	(67,979)	(67,497)
Net revenue		22,055,720	19,491,061	R$ 17,797,541
Amount Corresponding To Trcf Charged From Customers		R$ 92,232	R$ 80,329
[1] Includes the amount of R$ 92,232 corresponding to the TRCF charged from customers from the municipalities regulated by ARSESP (R$ 80,329 in 2021).

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The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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