生活饮用水中应含有一定量的余氯，以保证消毒效果。但余氯含量过高会对人体健康产生不良影响，如引起皮肤过敏、呼吸道刺激等。一般来说，余氯含量应在0.05-4mg/L之间。
Drinking water should contain a certain amount of residual chlorine to ensure disinfection effectiveness. However, excessive residual chlorine content can have adverse effects on human health, such as causing skin allergies, respiratory irritation, etc. Generally speaking, the residual chlorine content should be between 0.05-4mg/L.
微生物检测
microbiological analysis
微生物检测需要专业的实验室设备和技术。可以采集水样送到专业检测机构进行检测，以确定水中是否含有细菌、病毒、寄生虫等微生物。
Microbial testing requires professional laboratory equipment and technology. Water samples can be collected and sent to professional testing institutions for testing to determine whether the water contains microorganisms such as bacteria, viruses, parasites, etc.
生活饮用水中微生物含量应符合国家相关标准，否则可能会引起各种疾病。
The microbial content in drinking water should comply with relevant national standards, otherwise it may cause various diseases.
三、比较法
3、 Comparative method
与优质水源比较
Compared to high-quality water sources
可以将怀疑水质有问题的水与已知的优质水源进行比较。例如，与瓶装矿泉水、纯净水或从可靠水源处获取的水进行对比。
Suspected water quality issues can be compared to known high-quality water sources. For example, comparing with bottled mineral water, purified water, or water obtained from reliable sources.
如果两者在颜色、透明度、气味等方面存在明显差异，那么怀疑的水可能不符合标准。
If there are significant differences between the two in terms of color, transparency, odor, etc., then the suspected water may not meet the standards.
与以往水质比较
Compared to previous water quality
回忆过去该水源的水质情况，如果近期水质发生了明显变化，如颜色变深、气味加重等，可能说明水质出现了问题。
Recalling the water quality of the water source in the past, if there have been significant changes in water quality recently, such as darker colors or increased odors, it may indicate that there is a problem with the water quality.
例如，以前使用的自来水一直很清澈，近期突然变得浑浊，就需要进一步检查水质是否符合标准。
For example, if the tap water used to be very clear before suddenly becomes turbid, it is necessary to further check whether the water quality meets the standards.