Water Supply Act Article 91

For the purpose of promoting public health and safety, the authority-in-charge may order plants, restaurants, hotels, and other public places in its water service areas to hook up tap water.
中文原文 自來水法第91條
主管機關為促進公共衛生,保障人民安全,得令在供水區域內之工廠、餐館、旅社及其他公共場所接用自來水。

English translation for reference only; the Chinese text prevails. Not legal advice.