How can there be garbage charges for tap water charges in Kunming?

Kunming tap water charges garbage because water charges include sewage treatment fees and urban garbage treatment fees. Domestic water price is 3.45 yuan /m? (The price of tap water is 2.45 yuan /m? Sewage treatment fee 1.00 yuan /m? )。 The sewage used every month must be treated by the sewage plant to meet the standard before it can be discharged, otherwise it will pollute the groundwater. In the process of treatment, some expenses are incurred, and it is normal to have treatment expenses.