Water Supply Act Article 104

A water supply enterprise that charge users fees beyond those specified in its approved operating rules shall be punished with a fine that is three times of the overcharge.A water supply enterprise that charges users fees not according to the approved water rates or basic unit, or charges users additional fees shall be punished with a fine which is three times of the overcharge.
中文原文 自來水法第104條
自來水事業於法令核定之營業規則外,向用戶收取任何費用者,處其超收總額三倍之罰鍰。
自來水事業不依核定之水費或各種收費率或用水底度,向用戶增收費用者,處其增收總額三倍之罰鍰。

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