Drinking Water Management Act Article 14-1

When a natural disaster or other force majeure causes drinking water source quality to deteriorate, affected water supply entities for tap water, simple tap water, or community-installed public water supplies shall adopt contingency measures and strengthen drinking water quality testing promptly after the incident occurs. Affected water supply entities shall also promptly notify the public regarding water quality conditions and response measures via newspaper, television, radio, billboards, posted official announcements or other methods.
中文原文 飲用水管理條例第14-1條
因天災或其他不可抗力事由,造成飲用水水源水質惡化時,自來水、簡易自來水或社區自設公共給水之供水單位應於事實發生後,立即採取應變措施及加強飲用水水質檢驗,並應透過報紙、電視、電台、沿街廣播、張貼公告或其他方式,迅即通知民眾水質狀況及因應措施。

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