Water Supply Act Article 74

After finishing the construction of self-use water supply equipment, users shall request the local authority-in-charge to make inspection and forward the request to the water authority to examine hydraulic structures relating to water rights and water sources. Water supply to the aforementioned equipment shall not begin until the user has been issued a certificate for the equipment.
中文原文 自來水法第74條
自用自來水設備於工程完成後,應報請所在地主管機關查驗,並核轉水利主管機關查驗有關水權、水源之水利建造物合格,發給自用自來水設備登記證,始得供水。

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