Is Dujiangyan water fee paid first or later?

Dujiangyan water fee was paid later. According to relevant data, the water fee in Dujiangyan City is settled monthly, that is, the water fee is paid first. The toll hall of the customer service center of Dujiangyan Water Supply Company is located at No.313 Waibei Street, Dujiangyan City, Chengdu, Sichuan Province.