Go to the local office of the Taiwan Water Corporation  (台灣省自來水公司) or contact them at their call center:

Taiwan Water Corporation (main office serving Taichung and Nantou)

Call Center: (04) 2226-5655
TEL: (04) 2221-8341~8　FAX: (04) 2223-6425
2-1, ShuangShi Rd, Sec. 2
Website

Local offices:

_豐原服務所 Wufeng District

420臺中市豐原區南陽路298巷15號
15, Lane 298, NanYang Rd
(04)25269895

_大里服務所 Dali District
(04)24821831、(04)24820158
412臺中市大里區至聖路64號
64, ZhiSheng Rd

_東勢營運所 Dengshi District
(04)25874316
423臺中市東勢區中寧里正一街8號
8, LiZheng 1st Rd, Zhongning Village

_大甲營運所 Dajia District
(04)26872777
437臺中市大甲區東陽新村1號
1, XinYangXinCun

_清水營運所 Qingshui District
(04)26222614
436臺中市清水區大街路134號
134, DaJie Rd

_沙鹿營運所 Shalu District
(04)26312127
433臺中市沙鹿區北勢東路829號
829, BeiShi Rd

_大雅營運所 Daya District
(04)25660708
428臺中市大雅區中清路四段296號
296, ZhongQing Rd, Sec 4

_后里服務所 Houli District
(04)25562066
421臺中市后里區舊社路2-1號
2-1, JiuShe Rd

_霧峰營運所 Wufeng District
(04)23393138
413臺中市霧峰區民生路99巷7號
7, Lane 99, MinSheng Rd

_烏日營運所 Wuri District
(04)23381614
414臺中市烏日區五光路1031號
1031, WuGuang Rd

Water System Repair Offices (自來水維修)
If there is a problem with the water system (such as broken fire hydrants or water mains) or you suspect fraud or abuse call (04) 2222-1112, (04) 2244-7505 or email hqia@mail.water.gov.tw.