Water Act Article 60-3

To promote the economy of water resources, the authority-in-charge may order well owners to install recycling devices to recycle cooling water and recyclable water for industrial use.
中文原文 水利法第60-3條
為促進水資源之經濟使用,冷卻用水及可循環使用之工業用水,主管機關得命水井所有人加裝設備,以供再利用。

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