What could be the optimal charge of water supply and wastewater treatment in apartments?

With the growing satellite living and need to meet the domestic water and wastewater demand and compliance respectively, what could be the optimal charge of water supply and wastewater treatment in apartment complexes?

We can consider that the user pays for consumption and can assume that all water supplied need to be treated in an STP. I would like the experts in the forum to give their opinion on this.

Thanks in Advance.

Kannan

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