Please use the following link.
※Consumption tax rate turns into 10% from October 1, 2019, but please be careful as it is calculated in 8% in Web page.
※The addition gold system was abolished especially from June 1, 2020. Sorry for your inconvenience, but please remove sum of money of addition in particular.
http://archive.city.yokohama.lg.jp/suidou/kyoku/kougyo-yousui/gaisan-hiyou/ (the outside site)
Inquiry about water supply to Water Works Bureau customer Service Center