A.细菌总数＜100CFU/ml，总大肠细菌总数＜3个/L，游离余氯为0.05-0.3mg/L
B.细菌总数＜100CFU/ml,总大肠菌群每100ml水样中不得检出，游离余氯为0.05-0.3mg/L
C.细菌总数＜100CFU/ml,总大肠菌群每100ml水样中不得检出，游离余氯(适用于加氯消毒)在与水接触30分钟后应出厂水中不低于0.3mg/L,管网末梢水中不应低于0.05mg/L
D.细菌总数＜100个/ml,总大肠细菌总数＜3个/L，游离余氯(适用于加氯消毒)在与水接触30分钟后应不低于0.3mg/L