Drinking Water Quality Standards Article 5
For tap water, simple water supply and treatment facilities, and community-installed public water supply systems, when source water turbidity value exceeds 1,500 NTU caused by torrential rains or other natural disasters, the limit range of free residual chlorine may apply to the following values (shall apply only to water supply systems that add chlorine disinfectants).Article 5.pdf
中文原文 飲用水水質標準第5條
自來水、簡易自來水、社區自設公共給水因暴雨或其他天然災害致飲用水水源濁度超過一五○○NTU時，其飲用水水質自由有效餘氯（僅限加氯消毒之供水系統）得適用下列水質標準：┌────────────────┬───────┬─────┐│項目│限值範圍│單位│├────────────────┼───────┼─────┤│自由有效餘氯│○‧二～三‧○│毫克／公升││（FreeResidualChlorine）│││└────────────────┴───────┴─────┘